Datasheet

12

Rev. 1.11

2019-09-19

High Speed CAN Transceiver

TLE9251V

Modes of operation

6.3

Stand-by mode

The Stand-by mode is the power save mode of the TLE9251V. In Stand-by mode most of the functions are

turned off and the TLE9251V is monitoring the bus for a valid wake-up pattern (WUP). The following functions

are available (see also Figure 4 and Table 5):

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

• The normal-mode receiver is disabled.

• The low-power receiver is turned on and monitors the bus for a valid wake-up pattern (WUP).

• The RxD output pin follows the Bus signal after WUP detection.

• The bus biasing is connected to GND.

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

• The TxD time-out function is disabled.

• The overtemperature protection is disabled.

• The undervoltage detection on VCC is disabled. In Stand-by mode the device can operate without the

transmitter supply VCC.

• The undervoltage detection on VIO is enabled and powers down the device in case of detection.

The Stand-by mode can be entered from Normal-operating mode and Forced-receive-only mode by setting

the STB pin to logical “high”.

To enter Stand-by mode the digital supply VIO needs to be available (VIO > VCC(UV,R)).

6.4

Power-down state

Independent of the transmitter supply VCC and of the status at STB input pin the TLE9251V is powered down if

the supply voltage VIO < VIO(UV,F) (see Figure 4).

In the power-down state the differential input resistors of the receiver are switched off. The CANH and CANL

bus interface of the TLE9251V is floating and acts as a high-impedance input with a very small leakage current.

The high-ohmic input does not influence the recessive level of the CAN network and allows an optimized EME

performance of the entire HS CAN network. In power-down state the transceiver is an invisible node to the

bus.