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june 2009 doc id 1765 rev 7 1/15 15 l9637 monolithic bus driver with iso 9141 interface features operating power supply voltage range 4.5 v v s 36 v (40 v for transients) reverse supply (battery) protected down to v s -24 v standby mode with very low current consumption is sb 1 ma @ v cc 0.5 v low quiescent current in off condition is off = 120 a ttl compatible tx input bidirectional k-i/o pin with supply voltage dependent input threshold overtemperature shut down function selective to k-i/o pin wide input and output voltage range -24 v v k v s k output current limitation, typ. i k = 60 ma defined off output status in undervoltage condition and v s or gnd interruption controlled output slope for low emi high input impedance for open v s or gnd connection defined output on status of lo or rx for open li or k inputs defined k output off for tx input open integrated pull up resistors for tx, rx and lo emi robustness optimized description the l9637 is a monolithic integrated circuit containing standard iso 9141 compatible interface functions. so8 table 1. device summary order code package packing l9637d so8 tube l9637d013tr so8 tape and reel E-L9637D (1) 1. device in ecopack? package (see section 4: package information on page 13 ). so8 tube E-L9637D013tr (1) so8 tape and reel www.st.com
contents l9637 2/15 doc id 1765 rev 7 contents 1 block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
l9637 block diagram and pin description doc id 1765 rev 7 3/15 1 block diagram and pin description 1.1 block diagram figure 1. block diagram 1.2 pin description figure 2. pin connection (top view) tx rx lo gnd li - + vs vcc k 1,75v - + rtx rlo rrx ili ik off - + table 2. pin description n. name function 1 rx output for k as input 2 lo output l comparator 3 vcc stabilized voltage supply 4 tx input for k as output 5 gnd common gnd 6 k bidirectional i/o 7 vs supply voltage 8 li input l comparator rx lo vcc tx gnd k vs li 1 3 2 4 6 5 7 8
electrical specification l9637 4/15 doc id 1765 rev 7 2 electrical specification 2.1 absolute maximum ratings note: max. esd voltages are 2kv with human body model c = 100pf, r = 1.5k corresponds to maximum energy dissipation 0.2mj according to mil883c. 2.2 thermal data 2.3 electrical characteristics the electrical characteristics are valid within the below defined operating conditions, unless otherwise specified. the function is guaranteed by design until t jsdon temperature shutdown switch-on-threshold. table 3. absolute maximum ra tings (no damage or latch) symbol parameter value unit v s supply voltage iso transients t = 400 ms -24 to +36 -24 to +40 v v cc stabilized voltage -0.3 to +7 v v s /d t supply voltage transient -10 to +10 v/s v li, k pin voltage -24 to v s v v lo, rx, tx -24 to v cc v table 4. thermal data symbol parameter min. typ. max. unit t jsdon temperature k shutdown switch on threshold 160 - 200 c t jsdoff temperature k shutdown switch off threshold 150 - 200 c r th j-amb thermal steady state junction to ambient resistance 130 155 180 c/w table 5. electrical characteristics symbol parameter test condition min. typ. max. unit v s supply voltage - 4.5 - 36 v v cc stabilized voltage see note (1) 357v t j junction temperature - -40 - 150 c i cc supply v cc current v cc 5.5 v; vli,vtx = 0 v - 1.4 2.3 ma vk vk high ; vli vli high vtx = v cc @ v cc 5.5 v -5 <1 5 a
l9637 electrical specification doc id 1765 rev 7 5/15 is on supply v s current v s 16 v; vli, vtx = 0 v - 1.2 3 ma is off vk vk high ; vli vli high vtx vtx high @ v s 12 v - 120 220 a is sb v cc 0.5 v @ v s 12 v - <1 - a vk low input voltage low state rx output status low 4.5 v v s 18 v -24 - 0.45v s v rx output status low 18 v < v s -24 - 8 v vk high input voltage high state rx output status high 4.5 v v s 18 v 0.55v s -v s v rx output status high 18 v < v s 12 - v s v v khys input threshold hysteresis vk high - vk low - 0.025 v s 0.8 v i koff input current @ vtx vtx high vk v s ; v s , v cc 0 or v s , v cc = open -5 4 25 a rk on output on impedance @ v s 6.5 v vtx vtx low i k 7 ma (2) -1030 ik sc short circuit current 30 60 100 ma vtx low input voltage low state -24 - 1 v vtx high input voltage high state 2.5 - v cc v rrx on rlo on output on impedance vk vk low ; vli vli low v s 6.5 v i rx, lo 1 ma - 40 90 irx sc ilo sc output short circuit current 9 20 35 ma vrx h vlo h output voltage high state 10m r lrx 10m r llo v cc - 0.25 v cc - 0.1 v cc -v rlo rrx output pull-up resistance output status = (high) -0.15 v vlo v cc + 0.15 v -0.15 v vrx v cc + 0.15 v 51020k rtx input pull up resistance -0.15 v vtx v cc + 0.15 v 10 20 40 k vli low input voltage low state lo output status low 4.5 v v s 18 v lo output status low 18 v < v s -24 -24 - 0.45v s 8 v table 5. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
electrical specification l9637 6/15 doc id 1765 rev 7 vl high input voltage high state lo output status high 4.5 v v s 18 v lo output status high 18 v < v s 0.55v s 12 -v s v vli hys input threshold hysteresis vli high - vli low - 0.025v s 0.8 v ili input current vli v s v s , v cc 0 or v s , v cc = open -5 4 25 a c ki,lo,rx internal output capacities - - 20 pf f li-lo f k-rx f tx-k transmission frequency 9 v < v s < 16 v (external loads) r ko = 510 , c k 1.3 nf in active mode see figure 5 - - 50 khz t rli-lo t rk-rx t rtx-k rise time for the definition of t r , t f see figure 3 9 v < v s < 16 v (external loads) r ko = 510 , ck 1.3 nf -26s t fli-lo t fk-rx t ftx-k fall time - 2 6 s t off,li-lo t off,k-rx t off,tx-k switch off time for the definition of ton, t off see figure 3 . 9 v < v s < 16 v (external loads) r ko = 510 , c k 1.3 nf (inactive mode see figure 5 ) - 4 17 s t on,li-lo t on,k-rx t on,tx-k switch on time - 4 17 s 1. specs are tested at 5v only. compliance on vcc full range is guaranteed by design. 2. for output currents lower than this value a series protection diode can become active. see also figure 8 and 9 . table 5. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
l9637 electrical specification doc id 1765 rev 7 7/15 figure 3. input to output ti mings and output pulse shape t v t f t i v 20% t r 80% 80% 20% out t off t on
electrical specification l9637 8/15 doc id 1765 rev 7 figure 4. iso application circuit 40v up i/o i/o i/o 5v vcc vdd ecu1 k line l line ecu2 k l li k vs tx rx lo gnd li vs vcc k 1,75v rtx rlo rrx 510 ohm diagnostic tester ili c k 0.4 ohm - + - + ik off r ko c k - +
l9637 functional description doc id 1765 rev 7 9/15 3 functional description the l9637 is a monolithic bus driver designed to provide bidirectional serial communication in automotive diagnostic applications accord ing to the specification "diagnostic systems iso9141". the device provides a bidirectional link, called k, to the v ba t related diagnosis bus. it also includes a separate comparator l which is also able to be linked to the v ba t bus. the input tx and output rx of k are related to v cc with her integrated pull up resistances. also the l comparator output lo has a pull up resistance connected to v cc . the maximum external pull up resistance at k related to v s should not be higher than r ko 5 k to achieve clear output on conditions. all v bat bus defined inputs li and k have supply voltage dependent thresholds together with sufficient hysteresis to suppress line spikes. these pins are protected against overvoltages, shorts to gnd and v s and can also be driven beyond v s and gnd. these features are also given for tx, rx and li only taking into account the behavior of the internal pull up resistances. the thermal shut down function switches off the k output if the chip temperature increases above the thermal shut down threshold. to reactivate k again the temperature must decrease below the k switch on temp. to achieve no fault for v s undervoltage conditio ns the outputs will be switched o ff and stay at high impedance. the device is also protected against reverse battery condition. during lack of v s or gnd all pins shows high impedance characteristic. to realize a lack of the v s related bus line li and k the outputs lo and rx shows defined on status. suppressing all 4 classes of "schaffner" signals all pins can be load with short energy pulses of max. 0.2 mj. all these features together with a high possible baud rate >50kbaud, controlled output slopes for low emi, a wide power supply voltage range and a very small quiescent current during off (tx li k=high) condition is off typ 120 a, and a real standby function with zero power consumption is sb typ 1 a during system de powering v cc 0.5 v make this device high efficient for automotive bus system. after wake up of the system from off or sb condition the fi rst output signal will have an additional delay time td typ 5 s see also figure 5 . the typical output voltage behavior for the k, lo, rx outputs as a function of the output current is shown in figure 6 . figure 7 shows a waveform of the output signal when the low level changes from r on * i out to i out * 2 * r on + u be state. this variation occurs due to too low output current or after a negative transient forced to the output or to the supply voltage line.
functional description l9637 10/15 doc id 1765 rev 7 figure 5. typical timi ng for mode transitions li lo tx k rx t d t on li - lo t d t on tx - k off active active off
l9637 functional description doc id 1765 rev 7 11/15 figure 6. output characteristics at k, lo, rx figure 7. output signal shape related to output current i min out d s o n r v out 0.8v protection diode i out i out dson r * v out = + u be i out dson r 2 ** v out = t + u be i out dson r 2 ** i out dson r * t i min out i out > i min out i out > i min out i out < in v out v
functional description l9637 12/15 doc id 1765 rev 7 figure 8. ems performance (iso 9141 bus system) figure 9. input power vs. frequency diagram vs = 12v 50 ohm 10khz 510 ohm 136 ohm 68 ohm 1.5nf = 40db p im ax = 5w rhode & schw artz smg 0.1 - 1000mhz nap probe nap - 73 rx vs k is o i nte rfa ce vs tx k is o i nte rfa ce d 10% signal comparison d p i ?? 10% 10000 5000 1000 100 1 10 100 1000 f (m h z) not incident power resistant incident power resistant p i (m w )
l9637 package information doc id 1765 rev 7 13/15 4 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 10. so8 mechanical data and package dimensions outline and mechanical data dim. mm inch min. typ. max. min. typ. max. a 1.750 0.0689 a1 0.100 0.250 0.0039 0.0098 a2 1.250 0.0492 b 0.280 0.480 0.0110 0.0189 c 0.170 0.230 0.0067 0.0091 d (1) 4.800 4.900 5.000 0.1890 0.1929 0.1969 e 5.800 6.000 6.200 0.2283 0.2362 0.2441 e1 (2) 3.800 3.900 4.000 0.1496 0.1535 0.1575 e 1.270 0.0500 h 0.250 0.500 0.0098 0.0197 l 0.400 1.270 0.0157 0.0500 l1 1.040 0.0409 k0?8?0?8? ccc 0.100 0.0039 notes: 1. dimensions d does not include mold flash, protrusions or gate burrs. mold flash, potrusions or gate burrs shall not exceed 0.15mm in total (both side). 2. dimension ?e1? does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.25mm per side. so-8 0016023 d
revision history l9637 14/15 doc id 1765 rev 7 5 revision history table 6. document revision history date revision changes 24-jan-2002 5 initial release. 07-nov-2008 6 document reformatted. added table 1: device summary on page 1 . updated section 4: package information on page 13 . 15-jun-2009 7 updated the values of ?stabili zed voltage? and ?transmission frequency? parameters on table 5: electrical characteristics .
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