L9912 datasheet(54/84 Pages) STMICROELECTRONICS

54 / 84 page

Communication configurations

L9912

54/84

DocID029639 Rev 2

Communication configurations

The device supports different communication protocols on LIN/BSS pin for LIN and BSS

protocol, L pin for RVC protocol and RC pin for PCM and C-TERM protocols.

All protocols are mutually exclusive and can be activated through a combination of pins and

SPI bit settings; besides, LIN is available or not according to the device option.

The following table shows how to configure the system:

Table 35. How to configure the system

Protocol

SPI settings

Comment

PROT_SEL

lin_prot_in_use

Reg 0x08 – bit3

RVC_EN

Reg 0x09 – bit6

LIN

LIN circuitry is enabled and

LIN_TX_SP/LIN_RX_SP SmartPower pins

are active.

µC TIM1_CH3 pin is grounded

If the LIN option is not available, the

SmartPower LIN_RX_SP pin is grounded

BSS

BSS circuitry is enabled to carry the incoming

signal to µC TIM1_CH3 pin

LIN_RX_SP SmartPower pin is grounded

PCM

C-TERM

1(1)

PCM/C-TERM interface is enabled to carry

the incoming signal to µC TIM1_CH3 pin

LIN_RX_SP SmartPower pin is grounded

RVC

RVC interface is enabled to carry the

incoming signal to µC TIM1_CH3 pin

LIN_RX_SP SmartPower pin is grounded

1. PROT_SEL pin has an internal 100k pull-up resistor.

L9912 Datasheet(PDF) 54 Page - STMicroelectronics