MC33199 motorola,inc 1996 rev 1 automotive iso 9141 serial link driver motorola semiconductor iso 9141 serial link driver pin connections vcc ref-in-l ref-in-k lo rxd txd nc 1 2 3 11 4 12 13 14 ref-out vs l i1 gnd dia nc semiconductor technical data ordering information device temperature range package so14 - 40 c to +125 c MC33199d block diagram and typical application reference generator thermal shutdown current limit protection + - + - driver vs vcc ref-out lo ref-in-l ref-in-k rxd txd gnd dia i 1 l i 1 source vcc c2 c1 5 6 7 8 9 10 the MC33199d is a serial interface circuit used in diagnostic applica- tions. it is the interface between the microcontroller and the special k and l lines of the iso diagnostic port. the MC33199d has been designed to meet the ?diagnosis system iso9141? specification. the device has a bi-directional bus k line driver, fully protected against short circuits and over temperature. it also includes the l line receiver, used during the wake up sequence in the iso transmission. the MC33199d has a unique feature which allow transmission baud rate up to 200kbauds. ? electrically compatible with specification ?diagnosis system iso9141? ? transmission speed up to 200kbauds ? internal voltage reference genarator for line comparator thresholds ? txd, rxd and lo pins are 5v cmos compatible ? high current capability of dia pin (k line) ? short circuit protection for the k line input ? over temperature shutdown with hysteresis ? large operating range of driver supply voltage ? large operating temperature range ? esd protected pins f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 2 MC33199 note 1 : the device is compatible with specification: ?diagnosis system iso9141? note 2 : see the test circuit (fig.23). transient test pulse according to iso76371 and din 40839, highest test levels. maximum ratings ratings symbol value unit electrical ratings (note 1) vs supply pin: - dc voltage range - transient pulse (note 2) vs vpulse - 0.5 to + 40 - 2 to + 40 v vcc supply dc voltage range vcc - 0.3 to + 6 v dia and l pins (note 2) : - dc voltage range - transient pulse (clamped by internal diode) - dc source current - dia low level sink current - 0.5 to + 38 - 2 - 50 int. limit v v ma ma txd dc voltage range -0.3 to vcc +0.3 v ref-in dc voltage range - vs < vcc - vs > vcc -0.3 to vcc -0.3 to vs v esd voltage capability v(esd) +/-2000 v thermal ratings storage temperature tstg - 55 to + 150 c operating junction temperature tj - 40 to + 150 c thermal resistance, junction to air rtja 180 c/w max power dissipation (@ tamb=105 c) pd 250 mw electrical characteristics. tamb from - 40 c to + 125 c, vcc from 4.5v to 5.5v, vs from 4.5v to 20v unless otherwise note. typical values reflect approximate mean at 25 c, nominal vcc and vs, at time of device characterization. parameters symbol min typ max unit vcc pin 1 vcc supply voltage range vcc 4.5 5.5 v vcc supply current (note 3) icc 0.5 1 1.5 ma ref-in-l pin 2 and ref-in-k pin 3 ref-in-l & ref-in-k input voltage range: - for 0 MC33199 motorola 3 MC33199 note 3: measured with txd=vcc, i1=vs, dia & l high, no load, ref-in-l and ref-in-k connected to ref-out. input current @ 0 MC33199 motorola 4 MC33199 figur e 1. txd to dia ac characteristic figur e 2. dia to txd and l to lo ac characteristics rxd output : - low to high transition delay time - high to low transition delay time trdr trdf 450 450 ns lo output : - low to high transition delay time - high to low transition delay time tldr tldf 2 2 m s dia output : - low to high transition delay time - high to low transition delay time tddr tddf 650 650 ns i1 output @ vs-i1 > 2.7v : - rise time - hold time ti1r ti1f 1.5 0.3 4.5 m s parameters symbol min typ max unit dynamic characteristics. tamb from - 40 c to + 125 c, vcc from 4.5v to 5.5v, vs from 4.5v to 20v unless otherwise note parameters symbol min typ max unit tbit txd input signal 0v 5v dia output signal 10v 2v tddr tddf +5v +12v ref-out ref-in-l ref-in-k txd i1 dia gnd input signal test point 1nf vcc vbat tbit dia and l 0v 12v rxd ot lo output 4.5v 0.4v trdr / tldr trdf / tldf input signal signal +5v +12v ref-out ref-in-l ref-in-k txd l dia gnd input signal test points vcc vbat lo rxd 2k 2x30pf f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 5 MC33199 figur e 3. current source i1 ac characteristics at static high or low level txd, the current source i1 delivers a current of 3ma (typ). only during low to high transition, does this current increase to a higher value in order to charge the k line capacitor (cl<4nf) in a short time. figur e 4. current source i1 and dia discharge current test schematic. 120ma 40ma 4ma 2ma typical i1 waveform current source i1 maximum limit current source i1 minimum limit tx d signal 0v 5v tbit ti1f ti1h ti1r +5v +12v ref-out ref-in-l ref-in-k txd i 1 dia gnd input signal vcc vbat lo rxd to oscilloscope 10 w 33nf i1 pulse dia discharge current current f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 6 MC33199 figur e 5. logic diagram and application schematic figur e 6. : typical application with several ecus reference generator thermal shutdown current limit protection + - + - driver vs vcc : 5v ref-out lo ref-in-l ref-in-k rxd txd gnd dia i 1 l i 1 source vcc rxd txd +vbat l line k line car electronic control unit mcu r pu c2 c1 service tester checking system end of line programmation or manufacturer or mcu MC33199 e.c.u # 1 mcu e.c.u # 2 car +vbat l line k line fig 6 : typical application with several ecus car iso diagnostic connector service tester checking system end of line programmation or manufacturer or other ecus r pu MC33199 f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 7 MC33199 figur e 7. icc supply current versus temperature figur e 8. s supply current versus vs supply voltage figur e 9. is supply voltage versus vs supply voltage figur e 10. vs voltage versus is current (vcc=5.5v,vdia,l,i1=20v) figur e 11. ref-out voltage versus vs supply voltage figur e 12. ref-out voltage versus ref- out current -40 c 125 c 25 c f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 8 MC33199 figur e 13. l and dia hysteresis versus temperature figur e 14. l and dia current versus l and dia voltage figur e 15. dia saturation voltage versus temperature figur e 16. dia current limit versus temperature figur e 17. rxd pull-up resistor versus temperature figur e 18. txd and lo saturation voltage versus temperature i dia = 40ma rxd lo f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 9 MC33199 figur e 19. i 1 saturation voltage versus temperature figur e 20. i 1 output dc current versus temperature figur e 21. i 1 output pulse current versus vs supply voltage figur e 22. i 1 pulse current width versus temperature figur e 23. test circuit for transient schaffner pulses test pulses are directly applied to vs and via a capacitor of 1nf to dia and l. the voltage vs is limited to -2v/38v by the tran sient suppressor diode d1. pulses can occur simultaneously or separately. +12v i1 dia gnd vbat l schaffner generator 2x1nf 2x330pf 100nf d2 d1 i=40ma i=2ma f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 10 MC33199 device description i ntroduction the MC33199d is a serial interface circuit used in diag- nostic applications. it is the interface between the microcon- troller and the special k and l lines of the iso diagnostic port. the MC33199d has been designed to meet the ?diag- nosis system iso9141? specification. this product description will detail the functionality of the device (see simplified block diagram). first, the power supply and reference voltage generator will be discussed, then the paths functions between mcu, k and l lines will be detailed. a dedicated paragraph will tell about the special functionality of the i1 pin, which allow high baud rates transmission. power supplies and reference voltage the device has two power supplies : a 5v supply, vcc, normally connected to the mcu supply voltage. this pin sink typically 1ma during operation. a vbat supply voltage, vs, normally tied to the car battery voltage. this pin can sustain up to 40v dc. care should be taken for reverse battery protection and transient voltages higher than 40v. the voltage reference generator is supplied from both vcc and vbat. it provides reference voltage for the k and l lines comparators thresholds. the reference voltage is dependant on vbat voltage : it is linear versus vbat voltage, for vbat from 5,6v to 18v. below 5.6v and over 18v the reference voltage is clamped (see fig 11). the reference is connected externally to the device, through ref-out pin. it is available for other needs. it can supplied 50ua max (see fig 12). path functions between mcu, k and l lines the path function from the mcu to the k line is composed of a driver interfacing directly with the mcu through the txd pin. the txd pin is cmos compatible. this driver controls a power transistor which can be turned on or off. when it is on, it pull the dia pin low. this pin is known as k line in the iso 9141 specification. the dia pin structure is open collec- tor, without pull up component. this allow the connection of several MC33199 on the k line and the use of a single pull up resistor per system (see fig 6). in order to protect the dia pin against short circuits to vbat, the device incorporates a current limitation (see fig 16) and a thermal shutdown. this current limitation will also act when the device drives a k line bus exhibiting large parasitic capacitor value (see special functionality of i1 pin below). the path from this dia pin, or k line, to the mcu is done through a comparator. the comparator threshold voltage is connected to ref-in-k pin. it can be tied to the ref-out voltage, if the vbat dependant threshold to be achieved. the second input of this comparator is internally connected to dia pin. the output of the comparator is available on rxd output pin, normally connected to a mcu i/o port. rxd pin has a 2kohms internal pull up resistor. the path from the l line, used during wake-up sequence of the transmission, to the mcu is done through a second com- parator. the comparator threshold voltage is connected to ref-in-l pin. as the ref-in-k pin, it can be tied to the ref- out voltage, if the vbat dependant threshold need to be achieved. the second input of this comparator is internally connected to l pin. the output of the comparator is available on lo output pin, which is an open collector structure. lo is normally connected to a mcu i/o port. the dia, and l pins can sustain up to 38v dc. care should be taken for reverse battery protection and transient voltages higher than 38v. the dia and l pins both have internal pull down current source of typically 7,5ua (see fig 14). so the l line exhibits a 10ua pull down current. the dia pin has the same behaviour when it is in off state, that is when txd is at logic high level. special functionality of i1 pin the MC33199d has a unique feature which allow the transmission baud rate to be up to 200kbauds. in practice, the k line can be several meters long, and thus can have a large parasitic capacitor value. this parasitic capacitor value will slow down the low to high transition of the k line, and indeed will limit the baud rate transmission. for the k line to go from low to high level, the parasitic capacitor need to be charged, and it can only be charged by the pull up resistor. a low pull up resistor value would result in fast charge time of the capacitor, but also in large output current, and large power dissipation in the driver. to avoid this problem, the MC33199d incorporates a dynamic current source, which is temporary activated at the low to high transition of the txd pin, that is when the dia pin or k line should switch from low to high level (see fig 3 & 4). this current source is available at i1 pin. it has a typical value of 80ma. it is activated for 4us (see fig 21 & 22) and is automatically disabled after this time. during that time it will charge the k line parasitic capacitor. this extra current will quickly rise the k line voltage up to the vbat, and will result in reduce rise time on the k line. with this feature the MC33199d can ensure baud rate transmission of up to 200kbauds. during high to low transition on the k line, the parasitic capacitor of the bus line will be discharged by the output transistor of the dia pin. in this case, the total current may exceed the internal current limitation of the dia pin. if so, the current limitation will act, and discharge current will be lim- ited to typically 60ma (see fig 4 & 16). if a high baud rate is necessary, the i1 pin need to be con- nected to the dia as shown in the typical application fig 5. the i1 pin can also be left open, if the i1 functionality and high baud rate are not suited in the application. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 11 MC33199 pin function description pin 1 : vcc 5v typical power supply pin. typical supply current is less than 1.5ma. pin 2 : ref-in-l input reference for c2 comparator. this input can be con- nected directly to ref-out, with or without a resistor net- work, or to an external reference. pin 3 : ref-in-k input reference for c1 comparator. this input can be con- nected directly to ref-out, with or without a resistor net- work, or to an external reference. pin 4 : lo output of c2 comparator, normally connected to a micro- controller i/o. if l input > (ref-in-l + hyst/2) then output lo is in high state. if l< (ref-in-l - hyst/2) then output lo is in low state, output transistor on. this pin is an open collector structure. a pull up resistor should be added to vcc. drive capability of this output is 5ma. pin 5 : rxd receive output, normally connected to a microcontroller i/ o. if dia input > (ref-in-l + hyst/2) then output lo is in high state. if dia < (ref-in-l - hyst/2) then output lo is in low state, output transistor on. this pin has an internal pull up resistor to vcc (2k w typ). drive capability of this output is 5ma pin 6 : txd transmission input, normally connected to a microcontrol- ler i/o.this pin control dia output. if txd is high the output dia transistor is off. if txd is low the dia output transistor is on. pin 9 : dia input / output diagnosis bus line pin. this pin is an open collector structure, protected against over current and short circuit to vbat (vs). when turning on (txd low), this pin will pull the bus line to gnd, the current into dia will be internally limited to 60ma typ. the internal power transistor has a thermal shutdown cir- cuit, which forces the dia output off in case of over tem- perature. dia is also the c1 comparator input. it is protected against both positive and negative over voltage by a 38v zener diode. this pin exhibits a constant input current of 7,5 m a. pin 10 : gnd gnd reference for the entire device. pin 11 : i1 bus source current pin. it is normally tied to dia pin and to the bus line. at static high or low level txd, the current source i1 delivers a current of 3ma (typ). only during low to high transition, does this current increase to a higher value in order to charge the key line capacitor (cl<4nf) in a short time (see fig 3 and 4). pin 12 : l input for c2 comparator. this pin is protected against both positive and negative over voltage by a 38v zener diode. this l line is a second independent input. it can be used for wake up sequence in iso diagnosis or as an additional input bus line. this pin exhibits a constant input current of 7.5 m a. pin 13 : vs 12v typical, or vbat supply pin for the device. this pin is protected against over voltage transients. pin 14 : ref-out internal reference voltage generator output pin. its value depends on vs (vbat) values. this output can be directly connected to ref-in l and ref-in-k, or through a resistor network. maximum current capability is 50 m a. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33199 motorola 12 MC33199 motorola reserves the right to make changes without further notice to any products herein to improve reliability, function or design. motorola does not assume any liability arising out of the application or use of any product or circuit described herein ; neither does it convert any licence under its patent rights of others. motorola products are not authorized for use as components in life support devices or systems intended for surgical implant into the body or intended to support or sustain life. buyer agrees to notify motorola of any such intended end use whereupon motorola shall determine availability and suitability of its products for the use intended. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal employment opportunity/affirmative action employer. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
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