TLE9255WLC datasheet(38/100 Pages) INFINEON

tên linh kiện	TLE9255WLC

Giải thích chi tiết về linh kiện	HS CAN Transceiver with Partial Networking

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38 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

Fail Safe Functions

6.4

TxD Time-out Function

If the logical signal on the TxD pin is permanently “low”, then the TxD time-out feature protects the CAN bus

from blocked communication due to this errant logic signal on TxD. A permanent “low” signal on the TxD pin

can occur due to a locked-up microcontroller or in a short circuit on the printed circuit board, for example. In

Normal-operating Mode, a “low” signal on the TxD pin for the time t > tTXD_TO enables the TxD time-out feature

and the TLE9255W disables the transmitter (see Figure 34) and sets the TXD_TO bit in the register

TRANS_STAT. The timer tTXD_TO is configurable in SPI register TXD_TO_CTRL. The receiver is still active and the

RxD output pin continues monitoring data on the bus.

Figure 34

TxD time-out function

Figure 34 shows how the transmitter is deactivated and re-activated.To release the transmitter after a TxD

time-out event, the TLE9255W requires a signal change on the TxD input pin from “low” to “high”.

TxD

CANH

CANL

RxD

TxD time-out

TxD time–out released

t > tTXD_TO

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