2004 Jan 13

4

Philips Semiconductors

Product specification

LIN transceiver

TJA1020

FUNCTIONAL DESCRIPTION

The TJA1020 is the interface between the LIN master/slave protocol controller and the physical bus in a Local

Interconnect Network (LIN). The LIN transceiver is optimized for the maximum specified LIN transmission speed of

20 Kbaud providing optimum EMC performance due to wave shaping of the LIN output.

Operating modes

The TJA1020 provides two modes of normal operation, one intermediate mode and one very low power mode. Figure 3

shows the state diagram.

handbook, full pagewidth

SLEEP

switching on BAT

MGU243

(t(NWAKE = 0; after 1−>0) > tNWAKE

or

t(LIN = 0; after 1−>0) > tBUS)

t(NSLP = 1; after 0−>1) > tgotonorm

while TXD = 1

t(NSLP = 1; after 0−>1) > tgotonorm

while TXD = 0

t(NSLP = 0; after 1−>0) > tgotosleep

while TXD = 1

t(NSLP = 0; after 1−>0)

> tgotosleep

while TXD = 1

t(NSLP = 1; after 0−>1) > tgotonorm

while TXD = 0

t(NSLP = 1; after 0−>1) > tgotonorm

while TXD = 1

NORMAL

SLOPE MODE

LOW

SLOPE MODE

INH = HIGH

TERM. = 30 k

Ω

RXD = LOW

trx OFF

INH = HIGH

TERM. = 30 k

Ω

RXD = LINDATA

trx ON

INH = HIGH

TERM. = 30 k

Ω

RXD = LINDATA

trx ON

INH = FLOATING

TERM. =

HIGH-OHMIC

RXD = FLOATING

trx OFF

STANDBY

trx: transmitter.

TERM.: slave termination resistor, connected between pins LIN and BAT.

Fig.3 State diagram.