8.4 Device Functional Modes

8.4.1 Operating States

Unpowered

System

Standby

Mode

Normal Mode

Low Power

Mode

A

C

A

B

EN = 1

EN = 1

EN = 0

A

LIN Bus Wake−UP

or

NWake Pin Wake−Up

VSUP < VSUP_under

TXD: off

RXD: LOW

INH: HIGH (high

side switched on)

Term: 30 k

TXD: on

RXD: LIN bus data

INH: HIGH (high

side switched on)

Term: 30 k

TXD: off

RXD: floating

INH: high

impedance (high

side switched off)

Term: high

A: VSUP < VSUP_under

B: VSUP > VSUP_unde, EN = 0

C:VSUP > VSUP_unde, EN = 1

Figure 8-1. Operating States Diagram

Table 8-1. Operating Modes

MODE

EN

RXD

LIN BUS

TERMINATION

INH

TRANSMITTER

COMMENTS

Low Power

0

Floating

High impedance

High impedance

Off

Standby

0

Low

30 kΩ (typical)

High

Off

Wake-up event detected,

waiting on MCU to set EN

Normal

1

LIN bus data

30 kΩ (typical)

High

On

8.4.1.1 Normal Mode

This is the normal operational mode where the receiver and driver are active. The receiver detects the data

stream on the LIN bus and outputs it on the RXD pin for the LIN controller where recessive on the LIN bus is a

digital high and dominate on the LIN bus is digital low. The driver transmits input data on the TXD pin to the LIN

bus.

TPIC1021

SLIS113E – OCTOBER 2004 – REVISED MAY 2022

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