L9637 Monolithic bus driver with ISO 9141 interface Features ■ Operating power supply voltage range 4.5 V ≤ VS ≤ 36 V (40 V for transients) ■ Reverse supply (battery) protected down to VS ≥ -24 V ■ Standby mode with very low current consumption ISSB ≤ 1 mA @ VCC ≤ 0.5 V ■ Low quiescent current in off condition ISOFF = 120 µA ■ TTL compatible TX input ■ ■ Bidirectional K-I/O pin with supply voltage dependent input threshold High input impedance for open VS or GND connection ■ ■ Overtemperature shut down function Selective to K-I/O pin Defined output ON status of LO or RX for open LI or K inputs ■ Defined K output OFF for TX input open ■ Wide input and output voltage range -24 V ≤ VK ≤ VS ■ Integrated pull up resistors for TX, RX and LO ■ EMI robustness optimized ■ K output current limitation, typ. IK = 60 mA ■ Defined OFF output status in undervoltage condition and VS or GND interruption ■ Controlled output slope for low EMI Table 1. SO8 Description The L9637 is a monolithic integrated circuit containing standard ISO 9141 compatible interface functions. Device summary Order code Package Packing L9637D SO8 Tube L9637D013TR SO8 Tape and reel SO8 Tube SO8 Tape and reel E-L9637D(1) E-L9637D013TR (1) 1. Device in ECOPACK® package (see Section 4: Package information on page 13). June 2009 Doc ID 1765 Rev 7 1/15 www.st.com 15 Contents L9637 Contents 1 2 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 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 2/15 Doc ID 1765 Rev 7 L9637 Block diagram and pin description 1 Block diagram and pin description 1.1 Block diagram Figure 1. Block diagram VCC VS RTX K IK RL O + OFF RRX TX 1,75V RX + LI LO + IL I GND 1.2 Pin description Figure 2. Table 2. Pin connection (top view) RX 1 8 LI LO 2 7 VS VCC 3 6 K TX 4 5 GND Pin description N. Name Function 1 RX Output for K as input 2 LO Output L comparator 3 VCC 4 TX 5 GND Common GND 6 K Bidirectional I/O 7 VS Supply voltage 8 LI Input L comparator Stabilized voltage supply Input for K as output Doc ID 1765 Rev 7 3/15 Electrical specification L9637 2 Electrical specification 2.1 Absolute maximum ratings Table 3. Absolute maximum ratings (No damage or latch) Symbol VS VCC ΔVS/dt VLI, K Parameter Value Unit Supply voltage ISO transients t = 400 ms -24 to +36 -24 to +40 V Stabilized voltage -0.3 to +7 V Supply voltage transient -10 to +10 V/µs -24 to VS V -24 to VCC V Pin voltage VLO, RX, TX 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 Table 4. Thermal data Symbol Parameter Min. Typ. Max. Unit TJSDon Temperature K shutdown switch on threshold 160 - 200 °C TJSDoff Temperature K shutdown switch off threshold 150 - 200 °C Thermal steady state junction to ambient resistance 130 155 180 °C/W Rth j-amb 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 TJSDon temperature shutdown switch-on-threshold. Table 5. Symbol VS VCC Tj ICC 4/15 Electrical characteristics Parameter Supply voltage Test condition Min. Typ. Max. Unit 4.5 - 36 V 3 5 7 V -40 - 150 °C VCC ≤ 5.5 V; VLI,VTX = 0 V - 1.4 2.3 mA VK ≥ VKhigh; VLI ≥ VLIhigh VTX = VCC @ VCC ≤ 5.5 V -5 <1 5 µA - Stabilized voltage see note Junction temperature - Supply VCC current (1) Doc ID 1765 Rev 7 L9637 Table 5. Symbol Electrical specification Electrical characteristics (continued) Parameter ISON ISOFF Supply VS current ISSB VKlow VKhigh Input voltage low state Input voltage high state Test condition Min. Typ. Max. Unit VS ≤ 16 V; VLI, VTX = 0 V - 1.2 3 mA VK ≥ VKhigh; VLI ≥ VLIhigh VTX ≥ VTXhigh @ VS ≤ 12 V - 120 220 µA VCC ≤ 0.5 V @ VS ≤ 12 V - <1 - µA RX output status LOW 4.5 V ≤ VS ≤ 18 V -24 - 0.45VS V RX output status LOW 18 V < VS -24 - 8 V RX output status HIGH 4.5 V ≤ VS ≤ 18 V 0.55VS - VS V RX output status HIGH 18 V < VS 12 - VS V Input threshold hysteresis VKhigh - VKlow - 0.025 VS 0.8 V Input current @ VTX ≥ VTXhigh VK ≤ VS; VS, VCC ≥ 0 or VS, VCC = open -5 4 25 µA RKON Output ON impedance @ VS ≥ 6.5 V VTX ≤ VTXlow IK ≥ 7 mA (2) - 10 30 Ω IKSC Short circuit current 30 60 100 mA VTXlow Input voltage LOW state -24 - 1 V VTXhigh Input voltage HIGH state 2.5 - VCC V RRXON RLOON Output ON impedance 40 90 IRXSC ILOSC Output short circuit current 9 20 35 mA VRXH VLOH Output voltage HIGH state 10MΩ ≤ RLRX 10MΩ ≤ RLLO VCC0.25 VCC0.1 VCC- V RLO RRX Output pull-up resistance Output status = (HIGH) -0.15 V ≤ VLO ≤ VCC + 0.15 V -0.15 V ≤ VRX ≤ VCC + 0.15 V 5 10 20 kΩ RTX Input pull up resistance -0.15 V ≤ VTX ≤ VCC + 0.15 V 10 20 40 kΩ VLIlow Input voltage LOW state LO output status LOW 4.5 V ≤ VS ≤ 18 V LO output status LOW 18 V < VS -24 -24 - 0.45VS 8 V VKhys IKoff VK ≤ VKlow; VLI ≤ VLIlow VS ≥ 6.5 V IRX, LO ≥ 1 mA Doc ID 1765 Rev 7 - Ω 5/15 Electrical specification Table 5. L9637 Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max. Unit - VS V VLhigh Input voltage HIGH state LO output status HIGH 0.55VS 4.5 V ≤ VS ≤ 18 V 12 LO output status HIGH 18 V < VS VLIhys Input threshold hysteresis VLIhigh - VLIlow - 0.025VS 0.8 V Input current VLI ≤ VS VS, VCC ≥ 0 or VS, VCC = open -5 4 25 µA - - 20 pF - - 50 kHz - 2 6 µs - 2 6 µs - 4 17 µs - 4 17 µs ILI CKi,LO,RX Internal output capacities fLI-LO fK-RX fTX-k Transmission frequency trLI-LO trK-RX trTX-K Rise time tfLI-LO tfK-RX tfTX-K Fall time tOFF,LI-LO tOFF,K-RX tOFF,TX-K Switch OFF time tON,LI-LO tON,K-RX tON,TX-K Switch ON time 9 V < VS < 16 V (external loads) RKO = 510 Ω, CK ≤ 1.3 nF in active mode see Figure 5 for the definition of tr, tf see Figure 3 9 V < VS < 16 V (external loads) RKO = 510 Ω, CK ≤ 1.3 nF for the definition of ton, tOFF see Figure 3. 9 V < VS < 16 V (external loads) RKO = 510 Ω, CK ≤ 1.3 nF (inactive mode see Figure 5) 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. 6/15 Doc ID 1765 Rev 7 L9637 Electrical specification Figure 3. Input to output timings and output pulse shape VI t VOUT 80% 80% 20% 20% tr t OFF Doc ID 1765 Rev 7 tf t t ON 7/15 Electrical specification Figure 4. L9637 ISO application circuit VCC VS RTX RLO RRX 40V VS 5V R KO TX - 510 Ohm 0.4 Ohm C K K K VCC I/O + IK OFF 1,75V RX Diagnostic - Tester I/O uP + LI LO I/O - L ILI + GND L Line K Line ECU1 K CK LI ECU2 8/15 Doc ID 1765 Rev 7 VDD L9637 3 Functional description Functional description The L9637 is a monolithic bus driver designed to provide bidirectional serial communication in automotive diagnostic applications according to the specification "Diagnostic Systems ISO9141". The device provides a bidirectional link, called K, to the VBat related diagnosis bus. It also includes a separate comparator L which is also able to be linked to the VBat bus. The input TX and output RX of K are related to VCC with her integrated pull up resistances. Also the L comparator output LO has a pull up resistance connected to VCC. The maximum external pull up resistance at K related to VS should not be higher than RKO ≤ 5 kΩ to achieve clear output ON conditions. All VBat 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 VS and can also be driven beyond VS 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 VS undervoltage conditions the outputs will be switched OFF and stay at high impedance. The device is also protected against reverse battery condition. During lack of VS or GND all pins shows high impedance characteristic. To realize a lack of the VS 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 ISoff typ ≤ 120 µA, and a real standby function with zero power consumption ISSB typ ≤ 1 µA during system de powering VCC ≤ 0.5 V make this device high efficient for automotive bus system. After wake up of the system from OFF or SB condition the first output signal will have an additional delay time tdtyp ≤ 5 µs 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 RON * IOUT to IOUT * 2 * RON + UBE 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. Doc ID 1765 Rev 7 9/15 Functional description Figure 5. L9637 Typical timing for mode transitions O FF a c ti v e O FF a c tiv e LI LO TX K RX td 10/15 t ON td LI - LO Doc ID 1765 Rev 7 t ON TX - K L9637 Functional description Figure 6. Output characteristics at K, LO, RX IO UT M IN V OUT = IO U T * R D S O N V OUT = IO U T * 2 * R D S O N + U B E R DS ON IOU T p r o t e c tio n d i o d e 0 .8 V Figure 7. VO UT Output signal shape related to output current V IN t VOUT IO U T * 2 * R D S O N + U B E IO U T * R D S O N IO U T > IO U T M IN IO U T > IO U T t M IN I O U T < IO U T M IN Doc ID 1765 Rev 7 11/15 Functional description Figure 8. L9637 EMS performance (ISO 9141 bus system) V S = 1 2V = 510 Ohm VS 50 Ohm TX K P ro b e IS O i n te rfa c e 4 0 dB R h o d e & S c h w a rtz P im a x = 5 W 0 .1 - 1 0 0 0 M H z 136 Ohm NAP - 73 S MG 1 0k H z 1 .5 n F 68 Ohm VS Pi D RX K IS O i n te rfa c e NAP Signal comparison 10% D£ 10% Δ≤± Figure 9. Input power vs. frequency diagram P i (m W ) n o t i n c id e n t p o w e r re s i s ta n t 10000 5000 in c id e n t p o w e r r e s is t a n t 1000 100 1 12/15 10 Doc ID 1765 Rev 7 100 1000 f (M H z) L9637 4 Package information 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 mm inch DIM. MIN. TYP. A MAX. MIN. TYP. 1.750 MAX. 0.0689 A1 0.100 0.250 0.0039 A2 1.250 0.0492 b 0.280 0.480 0.0110 0.0189 0.230 0.0067 0.0091 0.0098 c 0.170 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 3.800 3.900 4.000 0.1496 0.1535 0.1575 (2) E1 e 1.270 0.0500 h 0.250 0.500 0.0098 L 0.400 1.270 0.0157 L1 k ccc 1.040 0˚ OUTLINE AND MECHANICAL DATA 0.0197 0.0500 0.0409 8˚ 0.100 0˚ 8˚ 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 Doc ID 1765 Rev 7 13/15 Revision history 5 L9637 Revision history Table 6. 14/15 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 “stabilized voltage” and “transmission frequency” parameters on Table 5: Electrical characteristics. Doc ID 1765 Rev 7 L9637 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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