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chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ? ? ? ? s s h h e e n n z z h h e e n n s s m m a a r r i i n n d d u u s s t t r r i i a a l l a a u u t t o o m m a a t t i i o o n n s s m m h h t t 2 2 0 0 1 1 5 5 h h a a r r t t ( ( m m o o d d e e m m ) ) ? ? ? ? [ sm h t2015 32 lqfp 28 plcc rohs ? ? ? HT2015 /sym20c 15 a5191hrt ? ?? ?? pcb HT2015 /sym20c15 ??? a5191hrt ????? ]
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc 1.0 ? (features) hart ?? HT2015 a5191hrt sym20c15 ? ? ????? ? 3.0v 5.5v ? ? 1200b/s fsk ? bell202 ? ?? 1200hz 2200hz ??? , ? hart ? 460.8khz ????? ?? : - 40 +85 32 lqfp ? 28plcc ? rohs ? sm h t2015 ??? fsk ? ? 1200 / e?? hart ? ???? 5v ?? 150 a 3.3v ? 110 a hart ? ????? hart ????? sm h t2015 32 lqfp rohs ? ?? HT2015 /sym20c15 a5191hrt ? ? ? ?? pcb HT2015 /sym20c15 ??? a5191hrt ????? ? 8 r6 2.0 ? general description sm HT2015 ??? hart ? cmos ?? ? hart ??? ???? hart Z? ?? ???? ???? 3.0 ? sm HT2015 32 lqfp ? 28 plcc ? ? 1 1: ? ? ? ? lqfp - 32p HT2015 - lq sm ? plcc - 28p HT2015 - pl sm ?
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ? 1. lqfp32 ??? plcc28 ??? 4.0 ? 2: ? pin descr iptions ?? ? signal type lqfp plcc description test5 1 5 ?? vss connect to vss. inreset input 2 6 ?? ? reset all digital logic when low test7 input 3 7 ? vss connect to vss. test8 input 4 8 ? vss connect t o vss. test9 input 5 9 ? vss connect to vss. vss ground. 6 ? ground. otxa output 7 10 ? ? hart Z fsk ? ??? 4 - 20 ? modulated output transmit analog. fsk modulated hart transmit signal to 4 - 20ma loop interface circuit. i aref input 8 11 ?? analog reference voltage. icdref input 9 12 ?? carrier detect reference voltage. ocbias output 10 13 ?? comparator bias current.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ? ? iaref: ?? ???????? ? 4 ????? ? icdref: ?? iaref icdref ???? ?????? ocd ? v* iaref - v icdref =80mv ? ??? 100mvp - p ? inreset: ?? ???? ??? ? vdd 2.5v inreset ??? 10ns ? 3 test10 input 11 14 ?? vss connect to vss. vssa 12 ? analog ground. vdda ? power 13 15 ?? analog supply voltage. irxa input 14 16 ? ? hart Z fsk ? ? 4 - 20 ? fsk modulated hart receive signal from 4 - 20ma loop interface circuit. . orxaf output 15 17 ?? ? analog receiver filte r input. irxac input 16 18 ?? ?? analog receive comparator input. oxtl output 17 19 crystal oscillator output. ixtl input 18 20 crystal oscillator input. vssa 19 ? analog ground. vss 20 21 ? ground. vd d ? 21 22 ?? digital supply voltage. inrts input 22 23 ?? request to send. itxd input 23 24 uart ?? otxa ? input transmit data. transmitted hart data stream from uart. test 11 24 25 no connect. orxd output 25 2 6 ? hart ? uart received demodulated hart data to uart. ocd output 26 27 ? irxa ??? carrier detect output. test12 input 27 28 no connect. test1 input 28 1 ?? vss connect to vss. test2 input 29 2 no connect. vd d ? power 30 ?? digital supply voltage. test3 input 31 3 no connect. test4 input 32 4 no connect.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ? inrts: ?? ??? ????? otxa ?? ? inrts ???? ???? otxa ?? ?? ????? ? irxa: ???? ? 4 - 20ma ? 1200/2200hz ?? ? 8 ? irxac: ??? ?????? ? itxd: ? ? nrz ? itxd ?? ? 0 ? otxa 2200hz ? itxd ?? ? 1 ? otxa ? 1200hz ? ? ixtl ? ???? 460.8khz ?? ?? ???? ? 9 ? 10 ? ? ocbias ?? ??????? ? ocbias ? i ocbias ?? 2.5 a ? ocd: ? ??????? ocd ? ?? iaref icdref ?? ? orxaf: ?? ??????? ? 8
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ? orxd: ? (cmos) ? ? 1200hz ?? orxd ?? ? 2200hz ?? orxd ?? orxd ? ocd ocd ???? orxd ??? ??? ? otxa: ?? ?? inrts ??? itxd ???? ?? 2200hz inrts ??? itxd ???? ??? 1200hz ? oxtl: ? ?? 460.8khz ?? 460.8 khz ? ? test(1 12): ?? ? vdd: ?? ? vdda: ?? ? vss: ? 32 ? lqfp ? 28 ? plcc ?? ? vssa: ? v iaref ? iaref ????? v icdref ? icdref ????? 5.0 sm HT2015 HT2015 sym20c15 a5191hrt ??? ???? ? ?? ? ??? 4 ?
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ??? ? ?????? ? ? hart Z ????? v iaref v icdref ? ?? ??? ??????? ? ? ?????? ????? ??? fsk ?? 1200hz ? 1 2200hz ? 0 1200 / 5.1 ?? itxd ???? nrz ? ?? otxa ? hart ? fsk ? ? 5 ? 6 ? inrts ?????? ? v iaref =1.235v dc ? ,otxa ? 0.25 0.75 v ??? v iaref =2.5vdc otxa ? 0.5 1.5v ??? ?? (ocd) 5.2 ? irxa fsk ? orxd ? ? 1200bps ?? 7 ? ?? ocd ?????? ( ?? 100mv p - p ) ?? ? orxd ? hart ??? 460.8khz( 1.0%) ir xa ??? ? orxd ??? 12%* ?????? ocd ? ? 4 ? 8 inrts ????? ocd ??? ? inrts ?
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ? 2.5ms ? ocd ????? ocd ??? ????? ocd ???? ? ? 1200hz 2200hz ? ??? 3.33ms 1.82ms 5.3 ?? 5.3.1 ? HT2015 v iaref v icdref ?? v iaref ??????? ? ? 4 ?? v iaref ? ocd ??????? v iaref - v icdref =80mv ??? 100mv p - p * 460.8khz ?? orxd ? 1200hz ???? ? orxd ??? 12%( 460.8khz ?? ) ? 1/1200*12%=100 s 5.3.2 ?? HT2015 ???? r bias o cbias vss ?? i ocbias ??? ? ???? 2.5 a v iaref 1.235v ? r bias ?? 500k 2.5v ???? 1m ? 8 ? ?? 5% ? 3m r2 ? 5% ?? 1% HT2015 ? 8 ????? ???? ??? 624hz ????? ?? 2500hz
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc HT2015 ? ???? 35hz ?? ???? 109hz ??? ?? 30% ?? ??? 50hz ? 6.7m 5.4 HT2015 oxtl ?? 460.8khz ?? ???? 5.4.1 ? ?? 460.8khz ?? ? 9 ?? 460.8khz 1 ? c1 c2 ???? c1 c2 ??? ? 33pf 470pf ? 5.4.2 ?? ? 10 ??? 460.8khz ?????? ? ixtl ?
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc ???? hart ? smar ?? . ?? ? ?? ????? ????? ???? smar ????? ?? ? ? ? ?????? ??????????? ? ???y?? ?? ??????? ? ??? ???? ??? ??? ???? ?? ?? ? ? ? ? ?????? ????? ? hart ? ???? ?? ?? ? ? ??????? http://shop33637954.taobao.com ???? ??? 100% ??? ?? qq: 774228246 0755 - 25324689 ??? hart ? / ?? profibus pa ?? / ??? ? smar ????? ?? ?? ? ???? ???? 400 smar ??? ? (system30 2) s m a r f i r s t i n f i e l d b u s ? ? profibus pa ???? smar ? ? ????? s y s t e m 3 0 2 opc ??? (hse) ?? h1 ????? s m a r ??? ?? ? ?? ? / ? / ?? / ?? ???? 2001 6 smar dfi302 ???? (hse) ?? (ld) ? ? ? ? 17% ?? hart ? sm HT2015 pl plcc28p ?? ?? ? ? hart ? sm HT2015lq lqfp32p ?? ?? ? ? hart ? ht20c12pl plcc28p ?? ? hart ? ht20 12pl plcc28p ?? ? hart ? HT2015pl plcc28p ?? ? hart ? ht20 c 15pl plcc28p ?? ? hart ? HT2015lq lqfp32p ?? ? hart ? ht20 c 15lq lqfp32p ?? ? hart ? sym2015 plcc28p ?? ? hart ? a5191hrtp g plcc28p ?? ? hart ? a 5191hrtlg lqfp32p ?? ? ? fb3050tq qfp ?? ?
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc hart modem HT2015 datasheet features ? can be used in designs presently using the HT2015 a5191hrt sym20c15 or equi valent type chip ? single - chip, half - duplex 1200 bits per second fsk modem ? bell 202 shift frequencies of 1200 hz and 2200 hz ? 2.7v - 5.0v power supply ? transmit - signal wave shaping ? receive band - pass filter ? low power: optimal for intrinsically safe applications ? c mos compatible ? internal oscillator requires 460.8 khz crystal or ceramic resonator ? meets hart physical layer requirements ? industrial temperature range of - 40 c to +85 c ? available in a 28 - pin plcc and 32 - pin lqfp packages (lqfp pictured)
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc general d escription the HT2015 is a single - chip,cmos modem for use in highway addressable remote transducer (hart) field instruments and masters. the modem and a few external passive components provide all of the functions needed to satisfy hart physical layer req uirements including modulation, demodulation, receive filtering, carrier detect and transmit - signal shaping. the HT2015 is pin - compatible with the HT2015 a5191hrt sym20c15 . see the pin description and functional description sections for details on pin compatibility with the HT2015 a5191hrt sym20c15 . the HT2015 uses phase continuous frequency shift keying (fsk) at 1200 bits per second. to conserv e power the receive circuits are disabled during transmit operations and vice versa. this provides the half - duplex operation used in hart communications.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc pin descriptions: iaref: ana log reference voltage this analog input sets the dc operating point of the operational amplifiers and comparators and is usually selected to split the dc potential between v dd and v ss . see iaref in dc characteristics on page 11. icdref: carrier detect ref erence voltage this analog input controls at which level the carrier detect (ocd) becomes active. this is determined by the dc voltage difference between icdref and iaref. selecting icdref - iaref equal to 0.08v dc will set the carrier detect to a nominal 1 00 mv p - p . inreset: reset digital logic when at logic low (v ss ) this input holds all the digital logic in reset. during normal operation inreset should be at v dd . inreset should be held low for a minimum of 10ns after v dd = 2.5 v as shown in figure 3. inr ts: request to send this active - low input selects the operation of the modulator. otxa is enabled when this signal is low. this signal must be held high during power - up. irxa*: analog receive input this input accepts the 1200/2200 hz signals from the exte rnal filter irxac: analog receive comparator input this is the positive input of the carrier detect comparator and the receiver filter comparator. itxd: digital transmit input (cmos) this input to the modulator accepts digital data in nrz form. when itxd is low, the modulator output frequency is 2200 hz. when itxd is high, the modulator output frequency is 1200 hz. ixtl: oscillator input this input to the internal oscillator must be connected to a parallel mode 460.8 khz ceramic resonator when using the internal oscillator or grounded when using an external
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc 460.8 khz clock signal. ocbias: comparator bias current the current through this output controls the operating parameters of the internal operational amplifiers and comparators. for normal operation, ocbias current is set to 2.5 4a ocd: carrier detect output this output goes high when a valid input is recognized on irxa. if the received signal is greater than the threshold specified on icdref for four cycles of the irxa signal, the valid input is reco gnized. o rxaf*: analog receive filter output this signal is the square wave output of the receiver high - pass filter. orxd: digital receive output (cmos) this signal outputs the digital receive data. when the received signal (irxa) is 1200 hz, orx d outputs logic high. when the received signal (irxa) is 2200 hz, orxd outputs logic low. orxd is qualified internally with ocd and is logic high when ocd is low. otxa: analog transmit output this output provides the trapezoidal signal controlled by itxd. when itxd is low, the output frequency is 2200 hz. when itxd is high, the output frequency is 1200 hz. this output is active when inrts is low and 0.5 v dc when inrts is high. oxtl: oscillator output this output from the internal oscillator must be connec ted to an external 460.8khz clock signal or to a parallel mode 460.8 khz ceramic resonator when using the internal oscillator. test(12:1): factory test these are factory test pins. for normal operation, tie these signals as per table1. vdd: digital powe r this is the power for the digital modem circuitry.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc vdda: analog supply voltage this is the power for the analog modem circuitry. vss: ground this is ground. vssa: analog ground this is the analog ground. functional description the HT2015 is a function al equivalent of the HT2015 a5191hrt sym20c15 hart modem. it contains a transmit data modulator and signal shaper, carrier detect circuitry, analog receiver and demodulator circuitry and an oscillator, as shown in figure 4. the internal hart modem modul ates the transmit - signal and demodulates the receive signal. the transmit - signal shaper enables the HT2015 to transmit a hart compliant signal. the carrier is detected by comparing the receiver filter output with the difference between two external volta ge references. the analog receive circuitry band - pass filters the received signal for input to the modem and the carrier detect circuitry. the oscillator provides the modem with a stable time base using either a simple external resonator or an external clo ck source.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc modem characteristics HT2015 logic the modem consists of a modulator and demodulator. the modem uses shift frequencies of nominally 1200 hz (for a 1) and 2200 hz (for a 0). the bit rate is 1200 bits/second. modula tor the modulator accepts digital data in nrz form at the itxd input and generates the fsk modulated signal at the otxa output. inrts must be a logic low for the modulator to be active. demodulator the demodulator accepts an fsk signal at the irxa inpu t and reproduces the original modulating signal at the orxd output. thenominal bit rate is 1200 bits per second. figure 5 illustrates the demodulation process. the output of the demodulator is qualified with the carrier detect signal (ocd), therefore, onl y irxa signals large enough to be detected (100 mvp - p typically) by the carrier detect circuit produce received serial data at orxd. maximum demodulator jitter is 12 percent of one bit given input frequencies within hart specifications, a clock frequency o f 460.8 khz (1.0 percent) and zero input (irxa) asymmetry.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc transmit C signal shaper the transmit - signal shaper generates a hart compliant fsk modulated signal at otxa. figure 6 and figure 7 show the transmit - signal forms of the HT2015. for iaref = 1.235 v dc , otxa will have a voltage swing from approximately 0.25 to 0.75 v dc . carrier detect circuitry the carrier detect comparator shown in figure 8 generates logic low output if the irxac voltage is below icdref. the comparator output is fed into a carrier detect block (see figure 4 on page 6). the carrier detect block drives the carrier detect output pin ocd high if inrts is high and four consecutive pulses out of the comparator have arrived. ocd stays high as long as inrts is high and th e next comparator pulse is received in less than 2.5 ms. once ocd goes inactive, it takes four consecutive pulses out of the comparator to assert ocd again. four consecutive pulses amount to 3.33 ms when the received signal is 1200 hz and to 1.82 ms when t he received signal is 2200 hz.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc analog receiver circuitry voltage references the HT2015 requires two voltage references, iaref and icdref. iaref sets the dc operating point of the internal operational amplifiers and comparato rs. a 1.235 v dc reference (analog devices ad589) is suitable as iaref. the level at which ocd (carrier detect) becomes active is determined by the dc voltage difference (icdref - iaref). selecting a voltage difference of 0.08 v dc will set the carrier detec t to a nominal 100 mv p - p . bias current resistor the HT2015 requires a bias current resistor to be connected between ocbias and v ss . the bias current controls the operating parameters of the internal operational amplifiers and comparators. the value of th e bias current resistor is determined by the reference voltage iaref and the following formula: the recommended bias current resistor is 499 kohm; when iaref is equal to 1.235 v dc . in figure 8 all external capacitor values have a tolerance of 5 perce nt and the resistors have a tolerance of 1 percent, except the 3 ohm; which has a tolerance of 5 percent. external to the HT2015, the filter exhibits a three - pole, high - pass filter at 624 hz and a onepole,low - pass filter at 2500 hz. internally, the ht201 5 has a high - pass pole at 35 hz and a low - pass pole at 90 khz. the low - pass pole can vary as much as 30 percent. the input impedance of the entire filter is greater than 150 kohm; at frequencies below 50khz.
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc oscillator the HT2015 requires a 460.8khz clock signal on oxtl. this can be provided by an external clock or external components may be connected to the HT2015 internal oscillator. internal oscillator option the oscillator cell will function with either a 460.8 khz crystal or ceramic resonator. a parallel resonant ceramic resonator can be connected between oxtl and ixtl. figure 9 illustrates the crystal option for clock generation using a 460.8 khz (i percent tolerance) parallel resonant crystal and two tuning capacitors. the actual v alues of the capacitors may depen d on the recommendations of the manufacturer of the resonator. typically, capacitor s in the range of 100 pf to 470 pf are used. external clock option it may be desirable to use an external 460.8 khz clock as shown in figur e 10 rather than the internal oscillator because of the high cost and low availability of ceramic resonators. in add ition, the HT2015 consumes less current when an external clock is used. minimum current consumption occurs with the clock connected to oxtl and ixtl connected to v ss .
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc electrical characteristics
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc mechanical specification
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc
chip race hart ? (modem) sm HT2015 ?? ?? shenzhen smar industrial automation www.smar.net.cn www.smar.cc

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