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 TLE9250 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 RxD output pin indicates the data received by the normal-mode receiver.

• The NEN and NRM 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.

Normal-operating mode is entered from Power-save mode and Receive-only mode, when the NEN input pin is

set to logical “low” and NRM input pin is set to logical “low”.

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

5.2

Receive-only mode

In Receive-only mode the transmitter is disabled and the receiver is enabled. The TLE9250 can receive data

from the bus, but cannot send any message (see also 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 RxD output pin indicates the data received by the normal-mode receiver.

• The NEN and NRM input pins are active and change the mode of operation to Normal-operating mode or

Power-save mode.

• The TxD time-out function is disabled.

• The overtemperature protection is disabled.

5.3

Power-save mode

In Power-save mode the transmitter and receiver are disabled. (see also Figure 4 and Table 2):

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

• The receiver is disabled and the data available on the bus is blocked.

• The RxD output pin is permanently set to logical “high”.

• The bus biasing is floating.

• The NEN and NRM input pins are active and change the mode of operation to Normal-operating mode or

Receive-only mode.

• The overtemperature protection is disabled.