TJA1042 データシートの表示（PDF） - NXP Semiconductors.

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TJA1042

High-speed CAN transceiver with Standby mode

NXP Semiconductors. 

NXP Semiconductors

TJA1042

High-speed CAN transceiver with Standby mode

7.2.5 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 oscillation due to

temperature drift is avoided.

7.3 SPLIT output pin and VIO supply pin

Two versions of the TJA1042 are available, only differing in the function of a single pin.

Pin 5 is either a SPLIT output pin or a VIO supply pin.

7.3.1 SPLIT pin

Using the SPLIT pin on the TJA1042T in conjunction with a split termination network (see

Figure 4 and Figure 7) can help to stabilize the recessive voltage level on the bus. This

will reduce EME in networks with DC leakage to ground (e.g. from deactivated nodes with

poor bus leakage performance). In Normal mode, pin SPLIT delivers a DC output voltage

of 0.5VCC. In Standby mode or when VCC is off, pin SPLIT is floating. When not used, the

SPLIT pin should be left open.

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Fig 4. Stabilization circuitry and application for version with SPLIT pin

7.3.2

VIO supply pin

Pin VIO on the TTJA1042T/3 and TJA1042TK/3 should be connected to the

microcontroller supply voltage (see Figure 8). This will adjust the signal levels of

pins TXD, RXD and STB to the I/O levels of the microcontroller. Pin VIO also provides the

internal supply voltage for the low-power differential receiver of the transceiver. For

applications running in low-power mode, this allows the bus lines to be monitored for

activity even if there is no supply voltage on pin VCC.

For versions of the TJA1042 without a VIO pin, the VIO input is internally connected to VCC.

This sets the signal levels of pins TXD, RXD and STB to levels compatible with 5 V

microcontrollers.

TJA1042

Product data sheet

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

Rev. 10 — 24 November 2017

© NXP N.V. 2017. All rights reserved.

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