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TJA1028

LIN transceiver with integrated voltage regulator

NXP Semiconductors. 

NXP Semiconductors

TJA1028

LIN transceiver with integrated voltage regulator

To avoid complicated timing in the application, EN and TXD can be pulled LOW at the

same time without having any effect on the LIN bus. In order to ensure that the remote

wake-up time (twake(busdom)min) is not reset on a transition to Sleep mode, TXD should be

pulled LOW at least td(EN-TXD) after EN goes LOW. This is guaranteed by design.

The user must ensure the appropriate level is present on pin TXD while the mode select

window is open.

EN

TXD

mode select window

operating

mode

Normal

tmsel(min)

Normal withTXD

path blocked

tmsel(max)

Sleep or Standby depending on

TXD level in mode select window

015aaa087

Fig 4.

TXD is sampled during the mode select window. The TJA1028 switches to Standby (TXD HIGH) or

Sleep (TXD LOW) mode after sampling.

Transition from Normal to Sleep/Standby mode

7.2 Power supplies

7.2.1

Battery (pin VBAT)

The TJA1028 contains a single supply pin, VBAT. An external diode is needed in series to

protect the device against negative voltages. The operating range is from 4.5 V to 28 V.

The TJA1028 can handle voltages up to 40 V (max). If the voltage on pin VBAT falls below

Vth(det)poff, the TJA1028 switches to Off mode, shutting down the internal logic and the

voltage regulator and disabling the LIN transmitter. The TJA1028 exits Off mode as soon

as the voltage rises above Vth(det)pon, provided the junction temperature is below Tth(rel)otp.

7.2.2

Voltage regulator (pin VCC)

The TJA1028 contains a voltage regulator supplied via pin VBAT, which delivers up to

70 mA. It is designed to supply the microcontroller and its periphery via pin VCC.

The output voltage on pin VCC is monitored continuously and a system reset signal is

generated (pin RSTN goes LOW) if an undervoltage event is detected (VCC < Vuvd for

tdet(uv)(VCC)).

7.3 LIN transceiver

The transceiver is the interface between a LIN master/slave protocol controller and the

physical bus in a Local Interconnect Network (LIN). It is primarily intended for in-vehicle

sub-networks using baud rates from 2.4 kBd up to 20 kBd and is LIN 2.0/LIN 2.1/SAE

J2602 compliant.

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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