TJF1051 datasheet(5/16 Pages) NXP

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TJF1051

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Product data sheet

Rev. 01 — 10 August 2010

5 of 16

NXP Semiconductors

TJF1051

High-speed CAN transceiver

6.2.3 Undervoltage detection on pins VCC and VIO

Should VCC or VIO drop below their respective undervoltage detection levels (Vuvd(VCC)

and Vuvd (VIO); see Table 6), the transceiver will switch off and disengage from the bus

(zero load) until VCC and VIO have recovered.

6.2.4 Overtemperature protection

The output drivers are protected against overtemperature conditions. If the virtual junction

temperature exceeds the shutdown junction temperature, Tj(sd), the output drivers will be

disabled until the virtual junction temperature falls below Tj(sd) and TXD becomes

recessive again. Including the TXD condition ensures that output driver oscillations due to

temperature drift are avoided.

6.3 VIO supply pin

Pin VIO should be connected to the microcontroller supply voltage (see Figure 3). This

adjusts the signal levels on pins TXD, RXD and S to the I/O levels of the microcontroller.

Application design-in information

Limiting values

Fig 3.

Typical application of the TJF1051

TXD

RXD

MICRO-

CONTROLLER

Pyy

TX0

RX0

VDD

GND

VCC

CANH

CANL

5 V

BAT

3 V

VIO

015aaa101

TJF1051

Table 4.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are referenced to GND.

Symbol

Parameter

Conditions

Min

Max

Unit

voltage on pin x

no time limit; DC value

on pins CANH and CANL

−58

+58

on any other pin

−0.3

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