L9788 datasheet(163/264 Pages) STMICROELECTRONICS

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DS12308 Rev 4

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L9788

LIN/K-LINE interface

263

LIN/K-LINE interface

13.1

Functional description

This interface is adapted to “LIN Specification Rev.2.1”, and it is also adapted to “K-LINE

Specification (ISO9141)”.

The Chip has over-voltage protection, loss of ground protection from -27 V to 40 V. -27 V

AMR is guaranteed at room & hot temperature. +40 V AMR is guaranteed in all temp

range.Short Circuit to Battery or Ground Protection is provided. If the bus line is short circuit

to battery, the over current protection is protected by current limitation function. Upon return

of connection, normal operation resumes without any intervention on the LIN bus line.

In case of power loss (VB_IN pin disconnected or power off) or ground loss (GND pin

disconnected) or LIN block in receive only mode (Transmition function disabled), the LIN

driver will not disturb the communication of the remaining transceivers connected to LIN or

KLINE bus. Upon return of connection, normal operation will resume without any

intervention on the LIN bus line.

LIN-TX is internally pulled up to internal 3.3 V.

All values in this section apply to the entire operating temperature and life of the U-chip.

The LIN block MAX baudrate is 20 Kbit/s.

Figure 71. Block diagram of LIN interface

13.2

LIN receive only mode

There is a MSC bit (LIN_TX_EN CONFIG-REG 11) to put the LINE block in receive only

mode (Transmition function disabled). Refer to reset matrix for the conditions to enter

receive only mode.

LIN interface

VB_IN

Dser_int

V3V3A

30 kOhm

1 kOhm

VBR

LIN

-27 V

+27 V

LIN Spec rev 2.1, ISO9141

short to VB protection

short to ground protection

LIN

PGND

LIN_TX

LIN_RX

GADG1212161148PS

L9788 Datasheet(PDF) 163 Page - STMicroelectronics

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