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L9637 Monolithic bus driver with ISO 9141 interface

L9637 Monolithic bus driver with ISO 9141 interface
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L9637 Monolithic bus driver with ISO 9141 interface - 1

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 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 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 Description The L9637 is a monolithic integrated circuit containing standard ISO 9141 compatible interface functions. Device summary Order code 1. Device in ECOPACK® package (see Section 4: Package information on page 13).

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L9637 Monolithic bus driver with ISO 9141 interface - 2

Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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L9637 Monolithic bus driver with ISO 9141 interface - 3

Block diagram and pin description Block diagram and pin description Block diagram Figure 1. Block diagram Supply voltage Stabilized voltage supply Input for K as output

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Electrical specification Electrical specification Absolute maximum ratings Table 3. Absolute maximum ratings (No damage or latch) Stabilized voltage Supply voltage ISO transients t = 400 ms Supply voltage transient Max. ESD voltages are ±2kV with human body model C = 100pF, R = 1.5k corresponds to maximum energy dissipation 0.2mJ according to MIL883C. Thermal data Thermal data Temperature K shutdown switch on threshold Temperature K shutdown switch off threshold Thermal steady state junction to ambient resistance Electrical characteristics The electrical characteristics are valid within the...

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Electrical specification Table 5. Electrical characteristics (continued)

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Electrical specification Table 5. Electrical characteristics (continued) Test condition Input voltage HIGH state LO output status HIGH 0.55VS 4.5 V VS 18 V 12 LO output status HIGH 18 V < VS Input threshold hysteresis VLIhigh - VLIlow Input current 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 tON,LI-LO tON,K-RX tON,TX-K 9 V < VS < 16 V (external loads) RKO = 510 , 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...

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L9637 Monolithic bus driver with ISO 9141 interface - 7

Electrical specification Figure 3. Input to output timings and output pulse shape VI

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Electrical specification Figure 4.

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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...

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Functional description Figure 5. Typical timing for mode transitions

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Functional description Figure 6. Output signal shape related to output current

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Functional description Figure 8. Input power vs. frequency diagram

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L9637 Monolithic bus driver with ISO 9141 interface - 13

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 OUTLINE AND MECHANICAL DATA 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...

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Revision history Revision history Table 6. Document revision history Initial release. Document reformatted. Added Table 1: Device summary on page 1. Updated Section 4: Package information on page 13. Updated the values of “stabilized voltage” and “transmission frequency” parameters on Table 5: Electrical characteristics. Updated disclaimer.

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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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use...

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