TLE9461ES datasheet(75/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

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

Datasheet

Rev.1.1

2019-09-27

11.1.1

Fail-Output Function

The fail output consists of a failure logic and an open-drain output (FO) with active-low signalization. It is the

default configuration after device power-up to support fail-safe functions.

The fail output is activated due to following failure conditions:

• Watchdog trigger failure (For config 3&4 only after the 2nd watchdog trigger failure and for config 1&2 after

1st watchdog trigger failure)

• Thermal shutdown TSD2

• VCC1 short to GND

• VCC1 over voltage (only if the SPI bit VCC1_OV_RST is set)

If FO is triggered, the SBC Fail-Safe Mode is entered (exceptions are watchdog trigger failures depending on

selected configurations - see Chapter 5.1.1). The fail output activation is signalled in the SPI bit FAILURE of

the register DEV_STAT.

The entry of SBC Fail-Safe Mode due to a watchdog failure can be configured as described in Chapter 5.1.1.

If the FO was activated due to a failure then it stays activated (pulled Low) in all SBC Modes.

In order to deactivate the fail output in SBC Normal Mode the failure conditions must not be present anymore

(e.g. TSD2, VCC1 short circuit, VCC1 over voltage - independent of the VCC1_OV_RST, etc) and the bit FAILURE

must be cleared via SPI command. In case of a FAILURE bit is set due to a watchdog fail, a successful WD

trigger is needed in addition, i.e. WD_FAIL must be cleared. WD_FAIL is also cleared when going to SBC Sleep

or SBC Fail-Safe Mode due to another failure (not a WD failure) or if the watchdog is disabled in SBC Stop Mode.

For testing purposes only the Fail Output can be activated via SPI by setting the bit FO_ON. This bit is

independent of the FO failure bits. In case there is no failure condition, the FO output can also be turned Off

again via SPI, i.e. no successful watchdog trigger is needed.

In case FO was activated via the SPI bit FO_ON it is disabled when entering SBC Restart Mode and stays Off in

SBC Normal Mode.

Note:

The Fail output pin is triggered for any of the above described failures.

Note:

The bit FO_ON can be written in any GPIO configuration. However, the fail-output pin FO/GPIO is

only activated if GPIO is configured as FO, i.e. the bit is ignored for any other GPIO configuration.

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