TLE9461ES datasheet(91/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

Supervision Functions

Datasheet

Rev.1.1

2019-09-27

Figure 38 VCC1 Over Voltage Timing Diagram

12.6

VCC1 Short Circuit Diagnostics

The supervision is implemented at the pin VIO (VIO must be connected to VCC1).

The short circuit protection feature for VCC1 is implemented as follows:

• The short circuit detection is only enabled if VS > VS,UV

•

If VCC1 is not above the VRTx within tVCC1,SC after device power up or after waking from SBC Sleep or Fail-

Safe Mode (i.e. after VCC1 is enabled) then the SPI bit VCC1_SC bit is set, VCC1 is turned Off, the FO pin is

enabled, FAILURE is set and SBC Fail-Safe Mode is entered. The SBC can be activated again via a wake-up

on CAN and WK or GPIO if configured as wake input.

• The same behavior applies, if VCC1 falls below VRTx for longer than tVCC1,SC.

12.7

VCC2 Undervoltage and VCAN Undervoltage

An undervoltage warning is implemented for VCC2 and VCAN as follows:

• VCC2 undervoltage detection: In case VCC2 is enabled and drops below the VCC2,UV,f threshold, then the SPI bit

VCC2_UV is set and can be only cleared via SPI. During power-up the blanking time tVCC2,Blank applies, i.e.

no undervoltage warning bit is set during this time.

• VCAN undervoltage detection: In case the CAN module is enabled and the voltage on VCAN drops below the

VCAN_UV,f threshold, then the SPI bit VCAN_UV is set and can be only cleared via SPI.

Note:

The VCC2_UV flag is not set during turn-On or turn-Off of VCC2.

RSTN

VCC1

tRD1

SBC Normal

tOV_filt

SBC Restart

SBC Normal

VCC1,OV

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