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TJA1028

LIN transceiver with integrated voltage regulator

NXP Semiconductors. 

NXP Semiconductors

TJA1028

LIN transceiver with integrated voltage regulator

The TJA1028T/xxx/20 and TJA1028TK/xxx/20 versions are optimized for a speed of

20 kBd, the maximum specified in the LIN standard. The TJA1028T/xxx/10 and

TJA1028TK/xxx/10 versions are optimized for a transmission speed of 10.4 kBd, as

specified in SAE J2602.

7.1 Operating modes

The TJA1028 supports four operating modes: Normal, Standby, Sleep and Off. The

operating modes, and the transitions between modes, are illustrated in Figure 3.

AII states

VBAT < Vth(det)poff OR

Tvj > Tth(act)otp

OFF

LIN = off

RXD = floating

RSTN = LOW

VBAT > Vth(det)pon AND

Tvj < Tth(rel)otp

remote

wake-up

STANDBY

LIN = off

(RXD signals

wake source)

EN = 1 AND

RSTN = 1

EN = 1 0 AND

TXD = 1 AND

RSTN = 1

NORMAL(1)

LIN = on

Voltage regulator - on

Voltage regulator - off

wake-up(3)

event

EN = 1 0 AND(3)

EN = 1 TXD = 0 AND

RSTN = 1

SLEEP

LIN = off

RXD = VCC(2)

RSTN = LOW

015aaa086

(1) In Normal mode, the LIN transmitter is enabled - but if EN and/or RSTN go LOW, the LIN

transmitter will be disabled. Remote wake-up signalling will be activated.

(2) Until VCC drops below 2 V.

(3) If a wake-up event and a go-to-sleep event occur simultaneously, the device will switch directly to

Standby mode without initiating a reset.

Fig 3. State diagram

7.1.1 Off mode

The TJA1028 switches to Off mode from all other modes if the battery supply voltage

drops below the power-off detection threshold (Vth(det)poff) or the junction temperature

exceeds the overtemperature protection activation threshold (Tth(act)otp).

The voltage regulator and the LIN physical layer are disabled in Off mode, and pin RSTN

is forced LOW.

7.1.2 Standby mode

Standby mode is a low-power mode that guarantees very low current consumption.

TJA1028

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 2 — 25 February 2011

© NXP B.V. 2011. All rights reserved.

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