TLE9461ES datasheet(79/140 Pages) INFINEON

79 / 140 page

TLE9461ES

Lite CAN SBC Family

Fail Output (FO) and General Purpose I/O (GPIO)

Datasheet

Rev.1.1

2019-09-27

11.1.3

WK and FO/GPIO HV-Sensing Function as Alternative Function

This function provides the possibility to measure a voltage, e.g. the unbuffered battery voltage, with the

protected WK HV-input. The measured voltage is routed out at FO/GPIO.

If this function is enabled with the WK_MEAS then neither the FO (including the FO test via FO_ON) nor the

GPIO functionality is available. Trying to enable the FO/GPIO functionality sets the SPI_FAIL flag.

If the measurement function is enabled the following items must be noted:

• The internal pull-up / pull-down structures are disabled and the internal WK signal is gated (blocked)

•The register WK_PUPD_CTRL can be modified but functionality changes are ignored. The GPIO_CTRL

cannot be modified while WK_MEAS = ‘1’. WK_MEAS cannot be set if FO is configured. In this case SPI_FAIL

is set.

FO must be set to Off first.

• The wake capability and voltage monitoring of the WK pin is disabled, i.e. WK_STAT_1 and WK_LVL_STAT

are not updated

• If GPIO WK is the only valid wake source then the SPI_FAIL flag is set when trying to enter SBC Sleep Mode

(see also Chapter 5.1) and SBC Restart Mode is entered

Please refer to Chapter 5.4 for more details on the functionality of the measurement unit.

TLE9461ES Datasheet(PDF) 79 Page - Infineon Technologies AG