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nju9214 preliminary 4?3/4 digit single chip digital multimeter lsi the nju9214 is a 4?3/4 digits single chip digital multimeter lsi with 42 segments bargraph display. the nju9214 realizes high precision of 40,000 counts measure- ment by the njrc original dual-slope a to d converter and realizes also quick response bargragh display and auto-ranging by another high speed dual-slope a to d converter. the input attenuator part is simplified because the resistor for resis- tance measurement is applied for voltage bleeder resistor. furthermore, the nju9214 realizes root-mean-square measurement for ac voltage and current by connecting a external rms-dc con- verter, and data output by the on chip rs-232c interface circuit. the nju9214 is suitable for high precision and high performance multimeter. package outline ? 4?3/4 digit display (available for up to 39,999 display) ? 42 segments quick response bargraph display ? njrc original dual-slope a to d converter (40,000counts) ? high speed dual-slope a to d converter (400counts) ? quick response auto-ranging (20times/sec) ? frequency/capacitance/tachometer/adapter measurement ? root-mean-square measurement by connecting a external rms-dc converter ? external relay driving ? data memory/data hold/relative display/max, min display ? power-on initializing ? auto power-off ? buttery life detector ? rotary/push sw mode selection ? 1/4 duty lcd display driver ? piezo buzzer direct driving ? rs-232c interface ? external reference input required ? low operating current ? c-mos technology ? package outline tqfp100 NJU9214FG1 ! ! ! ! ! general description ! ! ! ! ! features
nju9214 ! ! ! ! ! block diagram txd txd txd txd dtr dtr dtr dtr dsr dsr dsr dsr dcv dcv dcv dcv, , , , acv acv acv acv, ,, , ? ? ? ? , , , , , , , , , , , ,cap cap cap cap, ,, , dcma dcma dcma dcma, , , , acma acma acma acma, ,, , frq frq frq frq, , , , rpm rpm rpm rpm ivsl ivsl ivsl ivsl, , , , ivsh ivsh ivsh ivsh vi vi vi vi, ,, , vr2 vr2 vr2 vr2 to to to to 7 7 7 7, ,, , ovh ovh ovh ovh, ,, , ovx ovx ovx ovx switch switch switch switch network network network network high high high high resolution resolution resolution resolution a/d section a/d section a/d section a/d section high high high high speed speed speed speed a/d section a/d section a/d section a/d section batt batt batt batt low low low low detector detector detector detector lcd lcd lcd lcd controler controler controler controler lcd lcd lcd lcd reference reference reference reference regurator regurator regurator regurator vdda vdda vdda vdda agnd agnd agnd agnd vssa vssa vssa vssa vddd vddd vddd vddd vssd vssd vssd vssd +5.0v 0v +5.0v 0v +5.0v 0v +5.0v 0v -5.0v 5.0v -5.0v 5.0v -5.0v 5.0v -5.0v 5.0v 0v 0v 0v 0v high resolution a/d i/f high resolution a/d i/f high resolution a/d i/f high resolution a/d i/f high speed high speed high speed high speed a/d i/f a/d i/f a/d i/f a/d i/f switch switch switch switch network network network network i/f i/f i/f i/f frq frq frq frq buffer buffer buffer buffer high speed high speed high speed high speed a/d controler a/d controler a/d controler a/d controler high resolution high resolution high resolution high resolution a/d controler a/d controler a/d controler a/d controler switch switch switch switch network network network network controler controler controler controler key key key key controle controle controle controle 4bit cpu 4bit cpu 4bit cpu 4bit cpu buzzer buzzer buzzer buzzer controle controle controle controle r buzzer buzzer buzzer buzzer 4bitbus 4bitbus 4bitbus 4bitbus key matrix key matrix key matrix key matrix rs232c rs232c rs232c rs232c controler controler controler controler relay relay relay relay cont- cont- cont- cont- roler roler roler roler osc osc osc osc power on power on power on power on initialize initialize initialize initialize test test test test analog section digital section com1 com1 com1 com1 to 4 to 4 to 4 to 4 seg1 seg1 seg1 seg1 to to to to 28 28 28 28 fc1 fc1 fc1 fc1 to to to to 4 4 4 4, ,, , ki1 ki1 ki1 ki1 to to to to 5 5 5 5 trx trx trx trx txs txs txs txs rst rst rst rst pon pon pon pon reference reference reference reference buffer buffer buffer buffer lcd driver and lcd driver and lcd driver and lcd driver and power power power power external external external external resistors and switchs resistors and switchs resistors and switchs resistors and switchs a a a a vref1 vref1 vref1 vref1 vref2 vref2 vref2 vref2 vref3 vref3 vref3 vref3 capacitor capacitor capacitor capacitor a/d section a/d section a/d section a/d section rmsin rmsin rmsin rmsin sgnd sgnd sgnd sgnd adp adp adp adp rms-dc rms-dc rms-dc rms-dc converter converter converter converter rd1 rd1 rd1 rd1 to to to to 4 4 4 4 bz bz bz bz rs232c rs232c rs232c rs232c driver driver driver driver t1 t1 t1 t1 to to to to t3 t3 t3 t3 xt1 xt2 xt1 xt2 xt1 xt2 xt1 xt2 com com com com
nju9214 ! ! ! ! ! pin configuration ! ! ! ! ! terminal description 1 NJU9214FG1 seg17 seg25 seg24 seg23 seg22 seg21 seg20 seg19 seg18 dtr seg28 dsr seg26 seg27 vdsp xt1 xt2 bz txd vssd sleep vssa bld cif2 cif1 ki5 fc1 fc2 fc3 fc4 ki1 ki2 ki3 ki4 rms rc1 rc0 rc3 rc2 rd3 rd4 txs trx kms rd2 rd1 vddd rmsin acout vdda buf cl2 ch2 vref3 vref2 vref1 ch1 cl1 int1 int2 sgnd2 agnd ivsh ivsl adp sgnd1 ovx ovh vr7 vr6 vr5 vr4 v1 vr2 vr3 seg16 seg15 seg14 seg13 seg12 seg11 seg10 seg9 seg8 seg7 seg6 seg4 seg3 seg2 seg1 seg5 com4 com3 cmo2 com1 t3 t2 pon rst t1 510152025 30 35 95 40 45 50 55 60 65 70 75 80 85 90 100 . o nl o b m y so / in o i t c n u f 1t u o c at u o) m p r , q r f , a m c a , a c a t a d e s u ( l a n i m r e t t u p t u o r o t a u n e t t a 2a d d v- ) v 5 2 . 0 0 . 5 = a d d v ( d d v g o l a n a 3n i s m rn il a n i m r e t t u p n i e g a t l o v - s m r 4d d d v- ) v 5 2 . 0 0 . 5 = d d d v ( d d v l a t i g i d 8 o t 54 d r o t 1 d rt u ol a n i m r e t g n i v i r d y a l e r 9s x tn is p b 0 0 4 2 ; h s p b 0 0 6 9 ; l l a n i m r e t t c e l e s e t a r - t u p t u o c 2 3 2 s r 0 1x r tn il a n i m r e t t c e l e s n o i t c n u f c 2 3 2 s r 1 1s m kn il a n i m r e t t c e l e s e d o m y e k 2 1s m rn il a n i m r e t t c e l e s e d o m l o r t n o c e g n a r 0 2 o t 3 13 c r o t 0 c rn ik 0 0 3 ( e c n a t s i s e r p u - l l u p t u p n i h t i w l a n i m r e t t c e l e s e g n a r ? ) 0 2 o t 7 14 c f o t 1 c fo / ik 0 0 3 ( e c n a t s i s e r p u - l l u p t u p n i h t i w l a n i m r e t t c e l e s n o i t c n u f ? ) 5 2 o t 1 25 i k o t 1 i kn i k 0 0 3 ( e c n a t s i s e r p u - l l u p t u p n i h t i w l a n i m r e t l o r t n o c n o i t c n u f l a n o i t p o ? )
nju9214 . o nl o b m y so / in o i t c n u f 6 2n o pn i 0 0 3 ( e c n a t s i s e r p u - l l u p t u p n i h t i w l a n i m r e t e s a e l e r e d o m f f o - r e w o p o t u a ? ) k 7 2t s rn ik 0 1 ( e c n a t s i s e r p u - l l u p t u p n i h t i w l a n i m r e t t e s e r m e t s y s ? ) 0 3 o t 8 23 t o t 1 tn ik 0 0 3 ( e c n a t s i s e r p u - l l u p t u p n i h t i w l a n i m r e t t s e t ? ) 4 3 o t 1 34 m o c o t 1 m o ct u ol a n i m r e t n o m m o c d c l 2 6 o t 5 38 2 g e s o t 1 g e st u ol a n i m r e t t n e m g e s d c l 3 6r s dn il a n i m r e t y d a e r t e s a t a d c 2 3 2 s r 4 6r t dt u ol a n i m r e t l a n i m r e t - a t a d c 2 3 2 s r 5 6d x tt u ol a n i m r e t t u p t u o a t a d c 2 3 2 s r 6 6z bt u ol a n i m r e t g n i v i r d r e z z u b o z e i p 7 62 t xt u o) t u p t u o ( r e t r e v n i n o i t a l l i c s o l a t s y r c 8 61 t xn i) t u p n i ( r e t r e v n i n o i t a l l i c s o l a t s y r c 9 6p s d v0 / i l a n i m r e t o / i e g a t l o v g n i v i r d d c l 5 / 3 x ) d s s v - d d d v ( = p s d v : d e n e p o ) d s s v - d d d v ( = p s d v : d s s v o t d e t c e n n o c 0 7d s s v- v 0 = d s s v s s v l a t i g i d 1 7p e e l st u o) l e v e l " h " : f f o - r e w o p ( l a n i m r e t l a n g i s f f o - r e w o p o t u a 2 7a s s v- v 0 . 5 - = a s s v s s v g o l a n a 3 7d l bn iv 0 . 4 < d l b : n o i t c e t e d , l a n i m r e t r o t c e t e d e f i l y r e t t u b 5 7 , 4 71 f i c , 2 f i c0 / il a n i m r e t g n i t c e n n o c r o t i c a p a c n o i t a r g e t n i d e e p s - h g i h 6 7f u bt u ol a n i m r e t t u p t u o r e f f u b r o t a r g e t n i d e e p s - h g i h 8 7 , 7 72 h c , 2 l c0 / il a n i m r e t g n i t c e n n o c r o t i c a p a c e c n e r e f e r r o t a r g e t n i d e e p s - h g i h 1 8 o t 9 7 3 f e r v o t 1 f e r v n i l a n i m r e t t u p n i e g a t l o v e c n e r e f e r r o t a r g e t n i e t a r u c c a - h g i h : 1 f e r v l a n i m r e t t u p n i e g a t l o v e c n e r e f e r r o t a r g e t n i d e e p s - h g i h : 2 f e r v e g a t l o v e c n e r e f e r r o t a r g e t n i t n e m e r u s a e m e c n a t i c a p a c : 3 f e r v l a n i m r e t t u p n i 3 8 , 2 81 l c , 1 h c0 / i l a n i m r e t g n i t c e n n o c r o t i c a p a c e c n e r e f e r r o t a r g e t n i e t a r u c c a - h g i h " + " ; 1 h c , " - " ; 1 l c 5 8 , 4 82 t n i , 1 t n i0 / il a n i m r e t g n i t c e n n o c r o t i c a p a c r o t a r g e t n i e t a r u c c a - h g i h 7 8 , 6 81 d n g s , 2 d n g sn il a n i m r e t g n i s n e s g o l a n a 8 8d n g a- l a n i m r e t d n g g o l a n a 9 8h s v in il a n i m r e t g n i s n e s ) a ( t n e m e r u s a e m t n e r r u c 0 9l s v in il a n i m r e t g n i s n e s ) a m ( t n e m e r u s a e m t n e r r u c 1 9p d an il a n i m r e t t u p n i r e t p a d a 2 9x v on i) e c n a t i c a p a c , y t i u n i t n o c , e c n a t s i s e r ( l a n i m r e t g n i s n e s 3 9h v ot u o) e c n a t i c a p a c , e d o i d , y t i u n i t n o c , e c n a t s i s e r ( l a n i m r e t y l p p u s e g a t l o v 4 97 r v0 / ie g n a r v 0 4 , v 4 r o f l a n i m r e t e c n a t s i s e r r e d e e l b 5 96 r v0 / i0 0 4 r o f l a n i m r e t e c n a t s i s e r r e d e e l b ? e g n e r 6 95 r v0 / ik 4 , v 0 0 0 4 r o f l a n i m r e t e c n a t s i s e r r e d e e l b ? e g n e r 7 94 r v0 / ik 0 4 , v 0 0 4 r o f l a n i m r e t e c n a t s i s e r r e d e e l b ? e g n e r 8 93 r v0 / ik 0 0 4 , v 0 4 r o f l a n i m r e t e c n a t s i s e r r e d e e l b ? e g n e r 9 92 r v0 / ik 0 0 0 4 , v 4 r o f l a n i m r e t e c n a t s i s e r r e d e e l b ? e g n e r 0 0 1i vn ie g n a r v m 0 0 4 r o f l a n i m r e t t u p n i e g a t l o v
nju9214 ! ! ! ! ! function description each measurement functions shown below is available with the nju9214 . t n e m e r u s a e m n o i t c n u f e g n a rl a u n a m / o t u a e g a t l o v c a / c dv 0 0 0 4 o t v m 0 0 4e g n a r - 5 : l a u n a m / e g n a r - 4 : o t u a1 * t n e r r u c c a / c da m 0 0 0 4 o t a m 4e g n a r 4 - l a u n a m / e g n a r 2 - l a u n a m o t u a2 * t n e r r u c c a / c da 0 4d e x i f ( e c n a t s i s e r ? )0 0 4 ? m 0 4 o t ? e g n a r - 6 : l a u n a m / e g n a r - 6 : o t u a ) f ( y c n e u q e r fz h k 0 0 0 1 o t z h 0 0 1e g n a r - 5 : o t u a ) c ( e c n a t i c a p a c0 0 4 o t f n 4 fe g n a r - 6 : l a u n a m / e g n a r - 6 : o t u a ) m p r ( o h c a tm p r k 0 0 6 o t m p r 0 0 0 6e g n a r - 3 : o t u a ) ( e d o i dd e x i f ) ( y t i u n i t n o cd e x i f p d ad e x i f3 * *1 400mv range (ac/dc) is selected in only manual range. *2 4ma-4000ma range has auto/manual-2range and manual-4range mode, each mode needs its own application circuit. *3 adp is applied for oc, hfe and other measurement. the divided voltages which are output from each resistance r1 to r5 shown in following table are supplied to a/ d converter. in the ac measurement, after the dividing voltage, these output voltages are converted to dc voltages with the external rms/dc converter. this dc voltage is supplied into a/d converter. 10m ? resistor for input terminal may be easy to be affected by noises. therefore 10m ? and peripheral circuits require some protection like shields and so on for stable display. the resistors for attenuating should be selected with a flat temperature characteristic. especially, the resistors (10m ? , 10k ? , 1k ? ) for 400v, 4000v ranges should be selected carefully. for example, when 4,000v is input, 0.4ma (4,000v 10m ? ) flow through 10m ? , and the resistor consumes power of 1.6w (4,000v 0.4ma) and the temperature of the reference resistor. after measuring at 400v, 4,000v ranges, sometimes the uncorrect value is shown on the display at 4v, 40v ranges because the value of resister as the attenuator is changed by the temperature. ( 1 - 1 ) voltage (dcv, acv) measurements e g n a re t a r n o i s i v i d ) v m 0 0 4 ( 1 r1 ) v 4 ( 2 rm 1 ? m 0 1 / ? ) v 0 4 ( 3 rk 0 0 1 ? m 0 1 / ? ) v 0 0 4 ( 4 rk 0 1 ? m 0 1 / ? ) v 0 0 0 4 ( 5 rk 1 ? m 0 1 / ? ( 1 )measurement function
nju9214 ( 1 - 3 ) continuity test( ) the input attenuator is fixed to 400 ? range of the resistance measurement mode. when the value is less than 40 ? , the buzzer sounds. the output voltage on the measurement terminal is about 0.4v. if the display doesn't show 0 ? by resistances of lead wire when the terminals are shorted, this case requires adjustment at 0 ? using the relative function. ( 1 - 4 ) diode check( ) as shown below, six type resistors ( 10m ? ,1m ? ,100k ? ,10k ? ,1k ? ,100 ? ) connecting vr2 to vr7 are used for reference resistors of each range. the output voltage on the measurement terminal is almost same as the voltage inputted vref3. as shown in application circuits (1) to (3), an input protective diode must be connected with the ovh terminal. in resistance measurement, continuity test, diode check and capacitance mode, if the nju9214 is supplied high voltage on the ovh terminal from the external, the nju9214 may be broken completely. in the r1 (400 ? ) range, sometimes the resistor value shows wrong display because of the influence by test leads and wiring resistances of a circuit board. in this case, it needs to adjust on the relative function using the 0 ? resistance. in the r6 (40m ? ) range, it may take a time to get the correct measurement value by the influence of parasitic capacitance and may not show the stable value by the noise effects. ( 1 - 2 ) resistance measurement( ? ) e g n a re u l a v e c n a t s i s e r . r e f e r 0 0 4 ( 1 r ? )0 0 1 ? k 4 ( 2 r ? )k 1 ? k 0 4 ( 3 r ? )k 0 1 ? k 0 0 4 ( 4 r ? )k 0 0 1 ? k 0 0 0 4 ( 5 r ? )m 1 ? k 0 4 ( 6 r ? )m 0 1 ? the input attenuator is fixed to dc4v range. the output voltage on the ovh terminal is about 5v (vdda), and it is supplied to the measurement terminal through the sw1 (external switch or relay). current measurement provides the auto-manual 2-range mode(rms=h) and the manual 4-range mode (rms=l). these are changed by status of the rms terminal. each mode needs its own application circuit. in the auto-manual 2-range mode, the sense terminal is ivsl terminal at the 40ma range and ivsh terminal at the 400ma range. in the manual 4-range mode, the sense terminal is ivsl. in this mode, switching range is performed by changing the reference resistors. the sw for the reference resistor change must be operated together with the sws connecting to ' rc1 to rc3 '. ( refer to ( 2 - 1 - 3 ) ) ( 1 - 5 ) current ( dcma, acma ) measurement it is fixed to the 40a range. the sense terminal is the ivsh terminal. ( 1 - 6 ) current ( dca, aca ) measurement
nju9214 the input voltage is divided by the attenuator, and then the attenuator output is supplied to counter through the buffer. the divided voltage is converted to dc voltage by the external rms/dc converter, and the dividing voltage ratio of the input attenuator is changed by this dc voltage, noises or distorted waveforms sometimes show different display against actual frequency. the frequency range is always fixed to the auto-range mode. it is able to switch from 100hz to 1,000khz and the measurement cycle is 1 time a second. ( 1 - 7 ) frequency ( f ) measurement it is possible to measure numbers of revolution like as the revolutions of engine. the measurement is same way as the frequency measurement. the revolutions are calculated by the value of 60 times the frequency. the revolution range is always selected one of 6,000 to 600krpm automatically. the minimum input voltage ( wave amplitude ) is about 300mv and the measurement cycle is 1 time a second. ( 1 - 8 ) rpm measurement the constant-current charges the measured capacitor, and the charging time, while the voltage of capacitance reaches to the reference voltage, is measured and converted to the capacitance value. if the measured capacitor has any electric charges, accurate measurement is not available. therefore the measured capacitor must be discharged before measurement. the sense terminal is the ovx terminal. ( 1 - 9 ) capacitance ( c ) measurement the voltage between the adp terminal and the sgnd is supplied to the a/d converter directly. both of adp terminal ( + ) and sgnd terminal ( - ) are high-impedance in dc400mv range. therefore, it is also used as differential input. ( 1 - 10 ) adapter ( adp ) measurement the lock or push type input switch is applied for function selection. the switch type is selected in both of auto and manual ranges by the rms terminal setting. when the push type switch is selected, auto ranging is always selected. when the lock type switch is selected and the rms terminal is gnd ( l ) level, all ranges are selected by switches. but if the rms terminal is vdd level ( h ), auto range, manual range selection and the range set are performed by a push type switch. ( 2 ) switch input mode l a n i m r e t s m kl a n i m r e t s m rh c t i w se g n a r hh e p y t k c o l o t u a l l u f hl l a u n a m l* e p y t h s u po t u a l l u f e r a c t ' n o d : * both of lock and push type application have the chattering protective function which reject the chattering less than 20ms.
nju9214 the measurement function is set by fc1 to fc4 terminal. excepting the following settings, all others select the dcv measurement mode. ( 2 - 1 -1 ) measurement function selection ( kms = " h " ) ( 2 - 1 ) lock type switch ( 2 - 1 - 2 ) range setting ( lock type & auto-ranging : kms = rms = " h " ) the range shown in below table is controlled by a switch of the rc0 terminal which must go to "l" level ( gnd ) when it is pressed. when the switch is pressed once, the range is changed from auto-range to manual-range, and its range is held. then, the range is changed in every time by the switch operation. the range always returns to auto-range from any kinds of range when the switch is pressed over than 1 second. e d o m t n e m e r u s a e m1 c f2 c f3 c f4 c f v c d hhhh v c a l hhh a m c dhlhh a m c allhh ( e c n a t s i s e r ? )h h l h ) ( y t i u n i t n o clhlh ) ( e d o i dhllh ) c ( e c n a t i c a p a c lllh a c d hhhl a c alhhl ) f ( y c n e u q e r fhlhl m p rllhl p d ahhll e d o m t n e m e r u s a e m l o r t n o c g n i g n a r t l u a f e d e g n a r v c dr 2 r o t 5 r ( 5 r 2 )v 0 0 0 4 o t v 4v 4 v c ar 2 r o t 5 r ( 5 r 2 )v 0 0 0 4 o t v 4v 4 a m c dr 2 r o t 3 d l o h i r r ( 1 + i r 3 r 2 )a m 0 0 4 o t a m 0 4a m 0 4 a m c ar 2 r o t 3 r ( 3 r 2 )a m 0 0 4 o t a m 0 4a m 0 4 ( e c n a t s i s e r ? )r 1 r o t 6 r ( 6 r 1 )0 0 4 ? m 0 4 o t ? 0 0 4 ? ) ( y t i u n i t n o c d e x i f 0 0 4 ? ) ( e d o i d v 4 p d a v m 0 0 4 a c d a 0 4 a c a a 0 4 ) f ( y c n e u q e r fr 1 r o t 5 e g n a r - o t u a z h k 9 . 9 9 9 o t z h 0 0 1z h 0 0 1 ) m p r ( o h c a tr 1 r o t 3 m p r k 0 0 6 o t m p r 0 0 0 6m p r 0 0 0 6 ) c ( e c n a t i c a p a cr 1 r o t 6 d l o h i r r ( 1 + i r 6 r 1 )f u 0 0 4 o t f n 4f n 4 1push(>1sec) auto manual range up 1push(<1sec) 1push(<1sec)
nju9214 ( note ) frequency measurement and revolution measurement are always set to the auto-range. ranges of continuity test ( ), diode check ( ), adp, dca and aca measurement are always fixed to the default ranges. just after the power-on operation or mode changing, the range is set to the default range. in the adp measurement, three units are displayed by setting of rc1 to rc3 terminals. the r1 to r6 of above range control table are set as a range corresponding to below table. e g n a rv c dv c aa m c da m c a ? fm p rc r 1 v m 0 0 4a m 0 0 4 ?? 0 0 4 * ? z h 0 0 1 *0 0 0 6 *f n 4 * r 2 v 4 *v 4 *a m 0 4 *a m 0 4 *k 4 ? z h 0 0 0 10 0 0 0 6f n 0 4 r 3 v 0 4v 0 4a m 0 0 4a m 0 0 4k 0 4 ? z h k 0 1k 0 0 6f n 0 0 4 r 4 v 0 0 4v 0 0 4 ?? k 0 0 4 ? z h k 0 0 1 ? f u 4 r 5 v 0 0 0 4v 0 0 0 4 ?? k 0 0 0 4 ? z h k 0 0 0 1 ? f u 0 4 r 6 ???? m 0 4 ? ?? f u 0 0 4 ( 2 - 1 - 3 ) range setting ( lock type switch & manual-range : kms = " h ", rms = " l " ) the range setting shown in below table is available with rc1 to rc3 terminal. 1 c r2 c r3 c rv c a , v c da m c a , a m c d ? c hhh a m 0 0 4a m 40 0 4 ? f n 4 lhh v 4a m 0 4k 4 ? f n 0 4 hlh v 0 4a m 0 0 4k 0 4 ? f n 0 0 4 llh v 0 0 4a m 0 0 0 4k 0 0 4 ? f u 4 hhl v 0 0 0 4a m 4k 0 0 0 4 ? f u 0 4 lhl v m 0 0 4a m 4m 0 4 ? f u 0 0 4 hl l v m 0 0 4a m 40 0 4 ? f n 4 lll v m 0 0 4a m 40 0 4 ? f n 4 (note) the " * " mark means the default range. changing to dc400ma range or ac400ma is available by only manual operation. auto-range operation cannot change to these ranges. ( note ) frequency and revolution measurements are always set to the auto-range. ranges of continuity test ( ), diode check ( ), adp, dca and aca measurement are always fixed to the default ranges.
nju9214 all switches excepting for the power switch should be used non-locked push type switch. the range is set to the full auto-range mode and selected by the "range" key. when the power is turned on, the mode is set to the dcv. when the auto power-off is released, the mode returns to the previous mode of auto power-off. the functions of hold, min/max, mem, read and rel are same as ki1 to ki5 input using lock type switch which is explained in ( 4 ) attached functions. if some of switches are pressed at the same time, the input order is as follows, selection terminal : fc4 fc3 fc2 fc1 control terminal : ki5 ki4 ki3 ki2 ki1 ( 2 - 2 ) push type switch ( 2 - 2 - 1 ) measurement function selection ( kms = " l ", arms = " x " ) measurement function is set to the mode depending on the below matrix table; s l a n i m r e t l o r t n o c 1 i k2 i k3 i k4 i k5 i k n o i t c e l e s s l a n i m r e t 1 c fe r a c t ' n o dd l o hx a m / n i mn e md a e r 2 c fe r a c t ' n o dq r fp d al e rp a c 3 c fe r a c t ' n o dc a / c d ? 4 c fm p rva ma e g n a r < example of the switch circuit > n j u 9 2 1 4 kms fc1 fc2 fc3 fc4 ki1 ki2 ki3 ki4 ki5 rpm v ma a range vssd dc/ac ? frq adp rel cap min/max hold mem read
nju9214 ( note ) frequency measurement and tacho are always set to the auto-range. ranges of continuity test ( ), diode check ( ), adp, dca and aca measurements are always fixed to their default ranges. just after power-on operation or changing mode, their ranges are set to the default range. in the adp measurement, 3 units are displayed by setting of rc1 to rc3 terminals. range setting ( push type switch : kms = " l ", rms = " x " ) the range setting shown in below table is available with the " range " switch. when the switch is pressed once, the range is changed from auto to manual, and it?s range is held. then, the range is changed in everytime by the switch operation. when the switch is pressed over than 1 second, the range always returns to auto-range is possible from any range statuses. e g n a rv c dv c aa m c da m c a ? fm p rc r 1 v m 0 0 4a m 0 0 4--0 0 4 * ? z h 0 0 1 *0 0 0 6 *f n 4 * r 2 v 4 *v 4 *a m 0 4 *a m 0 4 *k 4 ? z h 0 0 0 10 0 0 0 6f n 0 4 r 3 v 0 4v 0 4a m 0 0 4a m 0 0 4k 0 4 ? z h k 0 1k 0 0 6f n 0 0 4 r 4 v 0 0 4v 0 0 4--k 0 0 4 ? z h k 0 0 1-f u 4 r 5 v 0 0 0 4v 0 0 0 4--k 0 0 0 4 ? z h k 0 0 0 1-f u 0 4 r 6 ----m 0 4 ? -- f u 0 0 4 the r 1 to r 6 of above range control table are set a range corresponding to below table. ( note ) the " * " mark means the default range. changing to dc400mv range or ac400mv range is available by only manual operation. auto-range operation cannot change to these ranges. when the auto-range is switched in dc400mv or ac400mv range, measurement is continued in the 400mv range. when overflow occurs in 400mv of the auto-range, its range changes to 4v range auto- matically. e d o m t n e m e r u s a e m l o r t n o c g n i g n a r t l u a f e d e g n a r v c dr 1 r o t 5 r ( 5 r 1 )v 0 0 0 4 o t v m 0 0 4v 4 v c dr 1 r o t 5 r ( 5 r 1 )v 0 0 0 4 o t v m 0 0 4v 4 a m c dr 2 r o t 3 d l o h i r r ( 1 + i r 3 r 2 )a m 0 0 4 o t a m 0 4a m 0 4 a m c dr 2 r o t 3 r ( 3 r 2 )a m 0 0 4 o t a m 0 4a m 0 4 ( e c n a t s i s e r ? )r 1 r o t 6 r ( 6 r 1 )0 0 4 ? m 0 4 o t ? 0 0 4 ? ) ( y t i u n i t n o c d e x i f 0 0 4 ? ) ( e d o i d v 4 p d a v m 0 0 4 a c d a 0 4 a c a a 0 4 ) f ( y c n e u q e r fr 1 r o t 5 e g n a r - o t u a z h k 9 . 9 9 9 o t z h 0 0 1z h 0 0 1 ) m p r ( o h c a tr 1 r o t 3 o t m p r 0 0 0 6 m p r k 0 0 6 m p r 0 0 0 6 ) c ( e c n a t i c a p a cr 1 r o t 6 d l o h i r r ( 1 + i r 6 r 1 )f u 0 0 4 o t f n 4f n 4 1push(>1sec) auto manual range up 1push(<1sec) 1push(<1sec)
nju9214 vssd ptc 500 ? ? ? ? acv,acma, frq,rpm dc400mv,adp sw3 dcv, acv , , , ? ? ? ? , cap, dcma, acma, frq, rpm, adp 0.99 ? ? ? ? 100 1k 10k 100k 1m 10m 100k 33k 33k nju9214 sw2 dcma, acma 0.01 ? ? ? ? 9 ? ? ? ? com 10a vddd gnd v dda vssa rectifier circuit block rms-dc converter power source sw sw1 sw2 sw3 sw4 sw5 sw8 sw7 sw changing coil of latching relay vddd vddd reset set 1k ? x 14 vddd 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 74hc138 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 74hc138 vssd sw7 0.022uf 100k ? ? ? ? others sw7 sw1 , , ? ? ? ? ,cap others sw5 0.1uf sw4 is used into the rectifier circuit block shown in the example of application circuit. sgnd2 sgnd1 agnd ivsh ivsl ovx adp or2 ovh or1 vr5 vr4 vr2 vr3 vi acout rmsin rd3 rd4 rd2 rd1 < example of the latching relay driver circuit > rd1 to rd4 are normally " h ". ( active " l " )
nju9214 about 10ms pulse width signal shown in below table is outputted from rd1 to rd4. this pulse controls the latching relay driving. ( 4 - 1 ) data hold : hold the hold or release of all display data is performed alternately by ki1 terminal input. however, a/d conversion is operating even though in the hold status, therefore the buzzer sounds at the over- range and the continuity test. in the auto-range operation, changing of range is available. ( 4 - 2 ) relative measurement : frel the relative measurement is selected when the switch connecting to ki2 terminal is pressed. in this mode, the value of difference between the present and the just before value is displayed. in case of the auto-range, the range is held at the just before range. however, the bargraph displays the absolute value, not the relative value. and the over-range also occurs from the absolute value of input. when the ki2 is pressed over than 1 second, the relative mode is released. ( 4 - 3 ) min. / max. hold : min/max when the switch connecting to terminal ki3 is pressed, the mode is circulated as follows ; min value hold max value hold hold release the bargraph always displays the input value. ( 4 - 4 ) data memory : men when the switch connecting to terminal ki4 is pressed, all of display data is stored into the memory. the stored data can be read out and displayed on lcd by pressing the read key connecting to terminal ki5, and [mem] mark blinks during this mode. this mode is released by pressing the read key connecting to terminal ki5. e g n a r n o i t c n u fy a l e r1 d r2 d r3 d r4 d r ? p a , , , t e s 1 w s t e s a m c a , a m c d2 w s p d a , v m 0 0 4 c d3 w s v m 0 0 4 c a4 w s ? , 5 w s a c a6 w s m p r , q r f , v c a , a c a , a m c a7 w s ? p a c , , , t e s e r 1 w s t e s e r p d a , a m c d2 w s p d a , a m 0 0 4 c d3 w s v m 0 0 4 c a4 w s ? , 5 w s a c a6 w s m p r , q r f , v c a , a c a , a m c a7 w s ( 4 ) attached functions ( functions with ki1 to ki5 are available by only lock type switches. )
nju9214 2khz buzzer sounds at following cases ; [ 1 ] key operation ( except function changing and range changing ) [ 2 ] auto-power off operation [ 3 ] continuity test ( ) ; less than 40 ? [ 4 ] releasing from relative mode and min / max display [ 5 ] changed between manual-range and auto-range by rco terminal [ 6 ] auto-range: overflowing at 4,000v range manual-range: overflowing at every range except 400mv range [ 7 ] power-on operating and releasing from the auto-power off mode [ 8 ] twice sounds from 24 seconds before and every 8 seconds ( 4 - 5 ) buzzer output ( 4 - 6 ) low-battery detector : bld if the supply voltage is less than 4.0 0.4v, [ batt ] mark is blinked. ( 4 - 7 ) auto power-off if the key-operation doesn't work over than 30 minutes, the power is turned off automatically after 1 second buzzer sound, and all display is disappeared. ( the data in the memory is kept ) when the pon terminal is pressed or power switch is turned off, this mode is released. in case of release by pon terminal, the previous value of the auto power-off operation is displayed for 2 sec- onds. to void this function, the power should be turned on with pressing the switch connecting to the pon terminal. the nju9214 gets some voltage surges during the power off mode by the auto power off operation, it might not return to usual operation correctly. ( 4 - 8 ) setting the mode at power-on, function and range changing ( 4 - 9 ) display of adp setting in measurement operation by the adp function, the following display setting by rc1 to rc3 terminals is avail- able. s n o i t c n u fn o - r e w o pg n i g n a h c n o i t c n u fg n i g n a h c e g n a r ) e g n a r o t u a ( e g n a re g n a r t l u a f e de g n a r t l u a f e d- d l o h e g n a r t e s e rt e s e r d l o h d l o h a t a d e r u s a e m e v i t a l e r t e s e r d l o h x a m / n i m y r o m e m a t a dy a l p s i d " 0 " l l ad l o hd l o h f f o - r e w o p o t u af f o o t u af f o o t u af f o o t u a
nju9214 the nju9214 has terminals (txd,dtr,dsr) for serial data output with rs-232c format requiring a external rs- 232c i/f lsi. when the trx terminal is " l " level, data transmission is available, and when dsr terminal is also " l " level, the data starts to output. it selects the transmission rate by the txs terminal, "l" level : 9,600bps, "h" level : 2,400bps. the logic levels from all of output terminals are " l " 0.8v, " h " 4.2v. ( 5 ) serial data output ( 5 - 1 ) the structure of the serial data an unit of serial data consists of 10bits. the first bit of data is start bit, the 2nd to the 9th bits are data bits, the 10th is stop bits, therefore 11bits data structures a character as an unit. the data is transmitted from the lsb in sequence. regarding the data order, please refer to [ ( 5 - 3 ) rs-232c data format ]. the data is outputted with the ascii code. ( 5 - 2 ) example of transmission waveform example of transmission waveform on the txd terminal is shown below. 0 1 0 0 1 1 1 0 0 1 0 1 0 1 1 1 0 0 0 1 data 39 (hex) data 1d (hex) 1 character 1 character 8 bit data 8 bit data start bit start bit stop bit stop bit d0 d1 d2 d3 d4 d5 d6 d7 d0 d1 d2 d3 d4 d5 d6 d7 1 c r2 c r3 c ry a l p s i d k r a mt n i o p l a m i c e de l p m a x e n o i t a c i l p p a hhh n o nn o nt n e m e r u s a e m e f h lhh 1 p d a1 p) t n e m e r u s a e m . p m e t ( c hl h 2 p d a1 p) t n e m e r u s a e m . p m e t ( f llh * * * hhl * * * lhl * * * hl l * * * lll * * * * : ( don't care )
nju9214 ( 5 - 3 ) rs-232c data format as shown below table, the data transmitted through the rs-232c is structured with 1 frame consisting of 17 characters. ( example ) dcv measurement value = 100mv ( 5 - 3 - 1 ) function ( 5 - 3 - 2 ) measurement mode ( 5 - 3 - 3 ) sign this sign shows the polarity of data. ( 5 - 3 - 4 ) data the data consists of six figures including a decimal point. n o i t c n u fr e t c a r a h c v c d v c d v c a v c a a c d a c d a c a a c a e c n a t s i s e r m h o y t i u n i t n o c k h c e d o i d o i d e c n a t i c a p a c p a c y c n e u q e r f q r f o h c a t m p r p d a p d a e d o m t n e m e r u s a e mr e t c a r a h c e u l a v e t u l o s b a a e u l a v e v i t a l e r r n g i sr e t c a r a h c r e b m u n e v i t i s o p) s u l p ( + r e b m u n e v i t a g e n) s u n i m ( - d c v .,a = + 100.01 m , [cr] function measurement mode sign data unit bld
nju9214 ( 5 - 3 - 5 ) unit this unit name shows the following characters. ( 5 - 3 -6 ) buttery life detector it shows the condition of buttery. ( 5 - 3 - 7 ) examples of various data [ ex.1 ] in dcv400mv range, when following voltage is measured. measured value 100.01mv format pattern the actual data from rs-232c line is shown below. [ ex.2 ] on the condition of ex.1, when relative mode is used. to calculate the relative value, the reference voltage must be required. the reference voltage is the measured voltage of relative mode. example of the reference voltage = 100.00mv. measured value 100.01mv relative value 100.01mv - 100.00mv = 0.01mv format pattern dcv, r=+000.01m, [cr] ascii code d c v , hex code &h44 &h43 &h52 &h2c ? ? ? rs-232c data 00010001011 01100001011 00100101011 00011010011 0 1 m , [cr] ? ? ? &h30 &h31 &h6d &h2c &h20 &h0d 00000110011 0100011011 01011011011 00011010011 00000010011 01011000011 dcv, a=+100.01m, [cr] e m a n t i n ur e t c a r a h c - a g e m m - o l i k k -) e c a p s ( - i l l i m m - o r c i m - o n a n n n o i t i d n o cr e t c a r a h c l a m r o n) e c a p s ( g n i n r a w y r e t t u b - w o l b
nju9214 format pattern [ ex.4 ] in dcv400mv range, when overflow is occurred on the negative voltage side by -401mv input. measured value overflow on the "-" side format pattern dcv, a=- ??? . ?? m, [cr] " ??? . ?? " shows overflow, "-" shows overflow on the negative side. dcv, a=+ ??? . ?? m, [cr] " ??? . ?? " shows overflow, "+" shows overflow on the positive side. [ ex.5 ] in dcv400mv range, when the battery life detector warns under the condition of ex.1. measured value 100.01mv format pattern dcv, a=+100.01m, b[cr] battery life detector [ ex.6 ] in aca400ma range, when the following current is measured. measured value 40.00ma format pattern aca, a=+040.00m, [cr] [ ex.7 ] in resistance 400k ? range, when the following resistance is measured. measured value 100.10k ? format pattern ohm, a=+100.10k, [cr] frq, a=+005.35k, [cr] [ ex.8 ] in frequency 10khz range, when the following frequency is measured. measured value 5.35khz format pattern [ ex.9 ] in tachometer 6000rpm range, the following revolution is measured. measured value 2500rpm rpm, a=+02500 , [cr] format pattern [ ex.3 ] in dcv400mv range, when overflow is occurred on the positive voltage side by 401mv input. measured value overflow on the "+" side
nju9214 1 g e s2 g e s3 g e s4 g e s5 g e s6 g e s7 g e s8 g e s9 g e s0 1 g e s 1 m o cn p b2 p b4 p b6 p b7 p b9 p b1 1 b p3 1 b p4 1 p b6 1 p b 2 m o c0 p b1 p b3 p b5 p b4 d8 p b0 1 p b2 1 p b3 d5 1 p b 3 m o c- p b- o t u a4 e4 g4 c4 p3 e3 g3 c 4 m o cc dt t a bc a4 f4 a4 bl e r3 f3 a3 b 1 1 g e s2 1 g e s3 1 g e s4 1 g e s5 1 g e s6 1 g e s7 1 g e s8 1 g e s9 1 g e s0 2 g e s 1 m o c8 1 p b0 2 p b1 2 p b3 2 p b5 2 p b7 2 p b8 2 p b0 3 p b2 3 p b4 3 p b 2 m o c7 1 p b9 1 p b2 d2 2 p b4 2 p b6 2 p b1 d9 2 p b1 3 p b3 3 p b 3 m o c3 p2 e2 g2 c2 p1 e1 g1 c1 p0 e 4 m o cd l o h2 f2 a2 bx a m1 f1 a1 bn i m0 f 1 2 g e s2 2 g e s3 2 g e s4 2 g e s5 2 g e s6 2 g e s7 2 g e s8 2 g e s// 1 m o c5 3 p b7 3 p b9 3 p b0 4 p bmkz hc 2 3 2 s r// 2 m o c0 d6 3 p b8 3 p bnfm p r ? /// 3 m o c0 g0 c mv f a / / / 4 m o c0 a0 bm e mf p ac /// ( 6 ) reference voltage the resolution of nju9214 is 25ppm ( 1/40000 ), and high precision is required for the reference power supply. the reference voltage requires a high precision and a temperature compensated type like as a band-gap refer- ence. reference voltages, vref1 and vref2 are about 0.2v, and vref3 is about 2v. ( 7 ) example of display layout ( 7 - 1 ) connection of common line ( 7 - 2 ) connection of segment line ( 7 - 3 ) segment assignment c m v a n f r p m m k ? ? ? ? h z rs232c apf com4 com3 com2 com1 batt rel hold max min men 0 10 20 30 40 f apf seg1 seg2 seg3 seg4 seg5 seg6 seg7 seg8 seg9 seg10 seg11 seg12 seg13 seg14 seg15 seg16 seg17 seg18 seg19 seg20 seg21 seg22 seg23 seg24 seg25 seg26 seg27 seg28 c m v a n f r p m m k ? ? ? ? hz rs232c 0 10 20 30 40 f a c d c auto a c d c auto batt rel hold max min men
nju9214 1. batt : low-battery detecting mark. 2. dc : displayed in dc voltage and dc current measurement mode. 3. ac : displayed in ac voltage and dc current measurement mode. 4. - : displayed in dc voltage and dc current measurement negative input. this mark doesn't display in ac voltage, ac current, resistance( ? ), frequency ( f ), diode ( ), and capacitance ( c ) and continuity ( ) measurement mode. 5. auto : displayed in the auto range measurement mode. 6. rel : displayed in the relative display measurement mode. 7. hold : data hold. displayed in memory read with read key. 8. max : displayed in maximum display mode. 9. min : displayed in minimum display mode. 10. mem : displayed during memorizing data. blinked during recalling the data. 11. : displayed in continuity test measurement mode. 12. : displayed in diode check measurement mode. 13. mv : displayed in dcmv and acmv ranges. 14. ma : displayed in dcma and acma ranges. 15. c : in adp measurement mode, displayed with adp1 mark. 16. f : in adp measurement mode, displayed with adp2 mark. 17. nf : displayed in capacitance measurement mode. ( 4nf, 40nf, 400nf ranges ) 18. f : displayed in capacitance measurement mode.( 4 f, 40 f, 400 f ranges ) 19. ? : displayed in resistance measurement mode.( 400 ? range ) 20. k ? : displayed in resistance measurement mode.( k ? range ) 21. m ? : displayed in resistance measurement mode.( m ? range ) 22. hz : displayed in frequency measurement mode.( hz range ) 23. khz : displayed in frequency measurement mode.( khz range ) 24. rpm : displayed in tachometer measurement mode. 25. rs-232c : displayed in available mode of rs-232c blinking under rs-232c operation. 26. apf : displayed under auto power off operation. after 30 minutes from the last key input, the power is turned off automatically. ( 7 - 4 ) explanation of display mark a 4 a3 a2 a1 a0 b4 b3 b2 b1 b0 c4 c3 c2 c1 c0 d4 p4 d3 p3 d2 p2 d1 p1 d0 e4 e3 e2 e1 e0 f4 f3 f2 f1 f0 g4 g3 g2 g1 g0 bp- bp0 bp40 bpn bpn bpn bpn bpn 0 10 20 30 40
nju9214 in cases of the ? 0 ? display value, ac voltage, ac current, resistance ( ? ), diode ( ), capacitance ( c ), frequency ( f ), tacho ( rpm ) and continuity test ( ) measurement mode, " - " mark is not displayed. however in relative measurement mode, any measurement modes display " - " . ( 7 - 5 ) bargraph display the bargraph displays 10 times speed comparing with numeric display. however it is not displayed in frequency, revolution and capacitance measurement mode. 1. bp- : displayed when negative signal is input. 2. bp0 : displayed when the digital display is more than about "00400". 3. bp1 to 40 : bp1 is displayed when the digital display is more than about "01000", then 1 segment display increases at every 1,000 counts. if overflow occurs, all of bp0 to bp40 are displayed. 4. the figures of " 0, 10, 20, 30, 40 "under the bargraph is displayed expecting for frequency, tacho and capacitance measurement mode. ( 7 - 6 ) over-range display when the over-range is occurred, the display becomes " 40000 " and all digit blinks. however " 0000 " is displayed in frequency measurement mode, " 60000 " is displayed in revolution measure- ment mode, " 4000 " is displayed in capacitance measurement mode, and also every digit blinks in these modes. in relative measurement mode, but it is not concerned with the display value. all of digits blink when over-range occurs by the absolute input value. ( 7 - 7 ) polarity display
nju9214 ! ! ! ! ! absolute maximum ratings vddd and vdda must be same voltage level. ! ! ! ! ! electrical characteristics ( 1 )dc characteristics ( vdd = + 5.0v, vssa= - 5.0v, agnd = dgnd = 0v, dc400mv range, ta=25c) note 1 : vdd is the general term for vdda and vddd. note 2 : in this case, all of key input levels are high. in case of ?low? level input into the key, 16ua current flow from a pin through an internal pull up resistance ( 300k ? typ. ) in txs, trx, kms, rms, rc 0 to 3, fc1 to 4, ki1 to 5, pon, t 1 to 3 terminals and 500ua current flow from rst terminal though a pull up resistance ( 10k ? typ. ). r e t e m a r a pl o b m y ss g n i t a rt i n u e g n a r e g a t l o v y l p p u sa s s v - a d d v1 1v d s s v - d d d v5 . 5v e g a t l o v l a n i m r e t l o r t n o cd i vd s s v o t d d d vv e g a t l o v l a n i m r e t g o l a n aa i va s s v o t a d d vv s l a n i m r e t t n e r r u c l a n i m e t y l p p u ss s i , d n g i , d d i0 5 a m l a n i m r e t h v oh v o i0 5 s r e h t oi i0 1 e r u t a r e p m e t g n i t a r e p or p o t0 5 + o t 0c e g n a r e r u t a r e p m e t e g a r o t sg t s t5 2 1 + o t 0 4 -c r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a mt i n ue t o n e g a t l o v g n i t a r e p od d v5 7 . 40 . 55 2 . 5v1 t n e r r u c g n i t a r e p o d d il a n i m r e t d d v--5 . 1a m f o p if f o r e w o p o t u a n i , l a n i m r e t d d v--1 0 . 0a m2 e g a t l o v y l p p u s e v i t a g e ns s vl a n i m r e t d d v5 7 . 4 -0 . 5 -5 2 . 5 -v e g a t l o v n o i t c e t e d y r e t t a b - w o ld l b vl a n i m r e t d l b v6 . 30 . 44 . 4v y t i r a e n i l y a l p s i d l a t i g i dn n i l k 0 0 1 = r o t s i s e r s e i r e s t u p n i ? -- 2 + 7 0 . 0 t n u o c s f % h p a r g r a bg n i l--5 s f % y t i r a l o p r o r r e y a l p s i d l a t i g i dn p e--2 + 7 0 . 0 t n u o c s f % h p a r g r a bg p e--5 s f % y a l p s i d g n i d a e r o r e zo r e z000t n u o c g n i l p m a s e m i t y a l p s i d l a t i g i dn s t-0 0 1- s m . m e c n a t i c a p a cc n s t-0 0 5- h p a r g r a bg s t-5- g n i l p m a s e t a r y a l p s i d l a t i g i dn r n-2- s / . c y c . m e c n a t i c a p a cc n r n-1- h p a r g r a bg r n-0 2- e g a t l o v t u p n i l e v e l h g i hh i v , 3 o t 0 c r , 4 o t 1 c f , x r t , s x t , 3 o t 1 t , 5 o t 1 i k l a n i m r e t t s r , s m r , s m k , n o p 2 . 4- - v e g a t l o v t u p n i l e v e l w o ll i v--8 . 0v e c n a t s i s e r p u - l l u p t u p n ii r , 3 o t 0 c r , 4 o t 1 c f , x r t , s x t l a n i m r e t n o p , 3 o t 1 t , 5 o t 1 i k 0 0 10 0 30 0 5 k ? l a n i m r e t t s r-0 1- ( ta=25c )
nju9214 dc characteristic (a/d conversion) ( vdd = +5.0v, vssa = -5.0v, agnd = dgnd = 0v, dc 400mv range, ta = 25c) note 3 : the current source outputs vdd = 5v as an open voltage, however in normal operation, about 1v as the threshold of comparator is maximum voltage. about 1v 0v sw1 sw2 about 1v sw2 sw1 measured capacitor ovx ovh nju9214 r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a mt i n ue t o n t n e r r u c g n i v i r d r e z z u b 1 h o i l a n i m r e t z b v 7 . 4 = h o v5 2 . 05 7 . 0- a m 1 l o iv 3 . 0 = l o v5 2 . 0 -5 7 . 0 -- t n e r r u c t u p t u o l a t i g i d 2 h o i l a n i m r e t d x t , r t d l a n i m r e t 4 o t 1 d r v 6 . 4 = h o v5 . 00 . 1- 2 l o iv 4 . 0 = h o v5 . 0 -0 . 1 -- l a n i m r e t t c e l e s t n e r r u c t u p t u o 3 h o i l a n i m r e t 4 o t 1 c f ) e d o m h c t i w s h s u p ( v 6 . 4 = h o v5 . 00 . 1- 3 l o iv 4 . 0 = h o v5 . 0 -0 . 1 -- e g a t l l o v n e p o t n e m e r u s a e m e c n a t s i s e r n i m h o vr o f d e s u ? t n e m e r u s a e m ,-4 . 0- v e g a t l o v g n i g r a h c t n e m e r u s a e m e c n a t i c a p a c n i p a c vt n e m e r u s a e m " c " r o f d e s u-5-3 t n e r r u c e g a k a e l t u p n i o l i l a n i m r e t i v v m 0 = n i v--0 1 a p f l iv m 0 0 4 = n i v--0 4 e g a t l o v g n i v i r d d c l ) . g n i t a o l f s i p s d v ( h v l a n i m r e t 4 o t 1 m o c , 8 2 o t 1 g e s ) e g a t l o v d d d v s v ( 9 . 0 -0 . 1 -2 . 1 - v4 l v8 . 1 -0 . 2 -2 . 2 - e g a t l o v g n i v i r d d c l ) . d e t r o h s e r a d s s v d n a p s d v ( h v4 . 1 -6 . 1 -8 . 1 - l v1 . 3 -3 . 3 -5 . 3 -
nju9214 note4 : lcd diving voltage ( example of output waveform ) waveform of 1/4 duty, dc400mv range, vin = 0mv note5 : terminals of digital line are protected by the esd protection circuit, however terminals of analog line aren't protected enough because the parasitic capacitance must be decreased. therefore, if the nju9214 is given static electricity, it may be permanent breakdown. therefore enough external surge protection is needed for assembling, carrying and keeping. vdd com1 vdsp vdd com2 vdsp vdd com3 vdsp vdd com4 vdsp vdd seg1 vdsp vdd seg2 vdsp vdd seg3 vdsp vdd seg4 vdsp 1 cycle ( 2 ) switching characteristic ( vdda = vddd = +5.0v, vssa = -5.0v, agnd = dgnd = 0v, dc4v range, fxt=4mhz, 25c) r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a mt i n u y c n e u q e r f t u p t u o r e z z u bz b fl a n i m r e t z b-0 . 2- z h k e t a r n o i s s i m s n a r t a t a dt u o tl a n i m r e t d x t ) h : s x t (-0 0 4 2- s p b ) l : s x t (-0 0 6 9- y c n e u q e r f r e v i r d d c ld c l f , 8 2 o t 1 g e s l a n i m r e t 4 o t 1 m o c -0 5- z h h t d i w e s l u p r e v i r d y a l e rd r w tl a n i m r e t 4 o t 1 d r-0 1- s m
nju9214 10k 30k 40k 180k 30k 40k 180k 50k 180k 50k 0.1u ? ? ? ? 1 0.33u ? ? ? ? 1 0.01u ? ? ? ? 1 510 ? ? ? ? 0.01u ? ? ? ? 1 0.01u ? ? ? ? 1 100k ? ? ? ? 2 10m ? ? ? ? 2 1m ? ? ? ? 2 100k ? ? ? ? 2 10k ? ? ? ? 2 1k ? ? ? ? 2 100 ? ? ? ? 2 vdda vddd 9 0.99 0.01 vddd acout vdda rmsin vddd rd1 rd2 rd3 rd4 txs trx kms rms rc0 rc1 rc2 rc3 fc1 fc2 fc3 fc4 ki1 ki2 ki3 ki4 ki5 cif1 cif2 bld vssa sleep vssd vdsp xt1 xt2 bz txd dtr dsr seg28 seg27 seg26 seg25 seg24 seg23 seg22 seg21 seg20 seg19 seg18 seg17 100uf 100k c m v a n f r p m m k ? ? ? ? hz rs232c 0 10 20 30 40 batt rel hold max min mem ac dc auto pon rs t t1 t2 t3 com1 com2 com3 com4 seg1 seg2 seg3 seg 4 seg5 seg6 seg7 seg8 seg9 seg10 seg11 seg12 seg13 seg14 seg15 seg16 vssd vi vr2 vr3 vr4 vr5 vr6 vr7 ovh ovx adp ivsl ivsh agnd sgnd1 sgnd2 int1 int2 cl1 ch1 vref1 vref2 vref3 ch2 cl2 buf nju9214 1 5 10 15 20 25 75 70 65 60 55 30 35 40 45 50 100 95 90 85 80 rectification circuit block adp 10a com battery rs232c driver : lock type switch : push type switch a gnd vdda +5v vssa -5v regulator 100uf 100uf vssd 100uf vddd +5v 100k fuse 100 ? 33k 100k 33k 33k vssd 10p 10p bz 4mhz vssd sw1 fuse sw2 apf dcv, acv, , , ? ? ? ? , cap, dcma, acma, frq, rpm sw7 0.022uf reference voltage element:over 2.5v temperature coefficient:below 20ppm/ c dc400mv:vi side others:vr2 side when ? ? ? ? / / / cap, sw1 is on. when acma/dcma,sw2 is on . sw3 ac measurement: ac coupling side 0.1u 0.1uf sw5 ! ! ! ! ! examples of application circuit. ( 1 ) circuit using lock type switch. ( current auto ? manual-2 range mode, rms = " h " ) ? 1 low-leak capacitors like as the polypropylene film type are required for accurate measurement. ? 2 within 0.01% tolerance resisters or the adjustment by the trimmer potentiometer are recommended. f
nju9214 ( 2 ) circuit using lock type switch ( current manual-4 range mode, rms = " l " ) 10k 30k 40k 180k 30k 40k 180k 50k 180k 50k 0.1u ? ? ? ? 1 0.33u ? ? ? ? 1 0.01u ? ? ? ? 1 510 ? ? ? ? 0.01u ? ? ? ? 1 0.01u ? ? ? ? 1 100k ? ? ? ? 2 10m ? ? ? ? 2 1m ? ? ? ? 2 100k ? ? ? ? 2 10k ? ? ? ? 2 1k ? ? ? ? 2 100 ? ? ? ? 2 vdda vddd 0.01 vddd acout vdda rmsin vddd rd1 rd2 rd3 rd4 txs trx kms rms rc0 rc1 rc2 rc3 fc1 fc2 fc3 fc4 ki1 ki2 ki3 ki4 ki5 cif1 cif2 bld vssa sleep vssd vdsp xt1 xt2 bz txd dtr dsr seg28 seg27 seg26 seg25 seg24 seg23 seg22 seg21 seg20 seg19 seg18 seg17 100uf 100k c m v a n f r p m m k ? ? ? ? h z rs232c 0 10 20 30 40 batt rel hold max min mem ac dc auto pon rst t1 t2 t3 com1 com2 com3 com4 seg1 seg2 seg3 seg4 seg5 seg6 seg7 seg8 seg9 seg10 seg11 seg12 seg13 seg14 seg15 seg16 vssd vi vr2 vr3 vr4 vr5 vr6 vr7 ovh ovx adp ivsl ivsh agnd sgnd1 sgnd2 int1 int2 cl1 ch1 vref1 vref2 vref3 ch2 cl2 buf nju9214 1 5 10 15 20 25 75 70 65 60 55 30 35 40 45 50 100 95 90 85 80 rectification circuit block a d p 10a com battery rs232c driver : lock type switch : push type switch agnd vdda +5v vssa -5v regulator 100uf 100uf vssd 100uf vddd +5v 100k 100 ? 33k 100k 33k 33k vssd 10p 10p bz 4mhz vssd sw1 fuse apf dcv, acv, , , ? ? ? ? , cap, dcma, acma, frq, rpm sw7 0.022uf reference voltage element:over 2.5v temperature coefficient:below 20ppm/ c dc400mv:vi side others:vr2 side when ? ? ? ? / / / cap, sw1 is on. when acma/dcma,sw2 is on. sw3 ac measurement:ac coupling side 0.1u 99 9 0.1 fuse 0.9 4ma 40ma 400ma 4000ma 0.1uf sw5 ? 1 low-leak capacitors like as the polypropylene film type are required for accurate measurement. ? 2 within 0.01% tolerance resistors or the adjustment by the trimmer potentiometer are recommended. f
nju9214 0.022uf acout vdda rmsin vddd rd1 rd2 rd3 rd4 txs trx kms rms rc0 rc1 rc2 rc3 fc1 fc2 fc3 fc4 ki1 ki2 ki3 ki4 ki5 10k 30k 40k 180k 30k 40k 180k 50k 180k 50k 0.1u ? ? ? ? 1 0.33u ? ? ? ? 1 0.01u ? ? ? ? 1 510 ? ? ? ? 0.01u ? ? ? ? 1 0.01u ? ? ? ? 1 100k ? ? ? ? 2 10m ? ? ? ? 2 1m ? ? ? ? 2 100k ? ? ? ? 2 10k ? ? ? ? 2 1k ? ? ? ? 2 100 ? ? ? ? 2 vdda vddd 9 0.99 0.01 cif1 cif2 bld vssa sleep vssd vdsp xt1 xt2 bz txd dtr dsr seg28 seg27 seg26 seg25 seg24 seg23 seg22 seg21 seg20 seg19 seg18 seg17 100uf 100k c m v a n f r p m m k ? ? ? ? h z rs232c 0 10 20 30 40 batt rel hold max min mem ac dc auto pon rst t1 t2 t3 com1 com2 com3 com4 seg1 seg2 seg3 seg4 seg5 seg6 seg7 seg8 seg9 seg10 seg11 seg12 seg13 seg14 seg15 seg16 vssd vi vr2 vr3 vr4 vr5 vr6 vr7 ovh ovx adp ivsl ivsh agnd sgnd1 sgnd2 int1 int2 cl1 ch1 vref1 vref2 vref3 ch2 cl2 buf n j u 9 2 1 4 1 5 10 15 20 25 75 70 65 60 55 30 35 40 45 50 100 95 90 85 80 rectification circuit block adp 10a com battery rs232c driver : lock type switch : push type switch a gnd vdda +5v vssa -5v regulator 100uf 100uf vssd 100uf vddd +5v 100k fuse 100 ? 33k 100k 33k 33k vss 10p 10p bz 4mhz vssd sw1 fuse sw2 apf dcv, acv, , , ? ? ? ? , cap, dcma, acma, frq, rpm sw7 reference voltage element:over 2.5v temperature coefficient:below 20ppm/ c dc400mv:vi side others:vr2 side when ? ? ? ? / / / cap, sw1 is on. when acma/dcma,sw2 is on. sw3 ac measurement:ac coupling side 0.1u 0.1uf sw5 ( 3 ) circuit using push type switch ( current auto ? manual-2range mode, kms = " l " ) ? 1 low-leak capacitors like as the polypropylene film type are required for accurate measurement. ? 2 within 0.01% tolerance resistors or the adjustment by the trimmer potentiometer are recommended. f
nju9214 ( 4 ) application circuit of ac voltage and ac current measurement in case of ac voltage and ac current measurement, ac-dc conversion is required in the external circuit. in use of the mean square circuit, the measurement circuit realizes low cost system. and also in use of rms/dc converter, it realizes a root-mean-square measurement. the circuit example using ad736 ( analog devices,inc. ) is shown below for a root-mean-square measurement. ( the circuit is for only reference, so please refer to the data book of analog devices, inc. for details. ) ( 5 ) notes of application circuits 1.the power source for nju9214 is required stable, and enough current drivability. 2.capacitors marked with ? 1 require low-leak type like as the polypropylene film. 3.resistance ratio precision of input attenuator block affects measurement precision. resistances marked with ? 2 requires within 0.01% tolerance resistors or adjustment by the trimmer potentiom- eter. 4.designing of circuit pattern requires low wiring resistance between agnd terminal and sgnd terminal. 5.constants of resistances for voltage dividing and decoupling capacitor are not guaranteed value as to character- istic. re adjustment is sometime required depending on elements and peripheral circuit. 6.rms/dc converter requires full-scale and zero adjustment. full-wave rectifier rms converter block vdda vssa agnd 10uf 33uf 10uf a d736 1 2 3 4 8 7 6 5 47k vdda a c400mv ac4v to 4000v range vssa 1n4148 1n4148 a c400mv nju9214 vr2 ( pin99 ) a cout ( pin1 ) rmsin ( pin3 ) 10m 0.022uf sw4_1 sw4_2 rectifier circuit block +
n j u 92 14 m e m o [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.

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