Data Sheet

9

Rev. 1.0

2017-08-09

HS CAN Transceiver

High Speed CAN Transceiver

Modes of operation

5.1

Normal-operating mode

In Normal-operating mode the transceiver TLE9251V sends and receives data from the HS CAN bus. All

functions are active (see also Figure 4 and Table 2):

• The transmitter is active and drives the serial data stream on the TxD input pin to the bus pins CANH and

CANL.

• The normal-mode receiver is active and converts the signals from the bus to a serial data stream on the RxD

output.

• The low-power receiver is turned off.

• The RxD output pin indicates the data received by the normal-mode receiver.

• The STB input pin is active and changes the mode of operation.

• The TxD time-out function is enabled and disconnects the transmitter in case a time-out is detected.

• The overtemperature protection is enabled and disconnects the transmitter in case an overtemperature is

detected.

an undervoltage event is detected.

Normal-operating mode is entered from Stand-by mode and Forced-receive-only mode, when the STB input

pin is set to logical “low”.

Normal-operating mode can only be entered when all supplies are available:

5.2

Forced-receive-only mode

The Forced-receive-only mode is a fail-safe mode of the TLE9251V, which will be entered when the transmitter

Figure 4 and Table 2):

• The transmitter is disabled and the data available on the TxD input is blocked.

•The normal-mode receiver is enabled.

• The low-power receiver is turned off.

• The RxD output pin indicates the data received by the normal-mode receiver.

• The bus biasing is connected to GND.

• The STB input pin is active and changes the mode of operation to Stand-by mode, if logical “high”.

• The TxD time-out function is disabled.

• The overtemperature protection is disabled.

• Forced-receive-only mode is entered from power-down state if the STB input pin is set to logical “low” and

• Forced-receive-only mode is entered from Normal-operating mode by an undervoltage event on the