TLE9263QX datasheet(108/164 Pages) INFINEON

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Data Sheet

108

Rev. 1.1, 2014-09-26

TLE9263QX

Supervision Functions

Figure 54

VCC1 Over Voltage Timing Diagram

15.7

VCC1 Short Circuit and VCC3 Diagnostics

The short circuit protection feature for

CC1 is implemented as follows (VS needs to be higher than VS,UV):

•

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

the SPI bit VCC1_SC bit is set, VCC1 is turned OFF, the FOx pins are enabled, FAILURE is set and SBC Fail-

Safe Mode is entered. The SBC can be activated again via wake on CAN, LINx, WKx.

•

The same behavior applies, if

CC1 falls below VRTx for more than tVCC1,SC.

VCC3 diagnosis features are implemented as follows:

•

Load Sharing: The external PNP is disabled when VS < VS,UV if VCC3_VS_ UV_OFF = 0 or when in SBC Stop

Mode if VCC3_LS_ STP_ON = ‘0’. All other diagnostic features are disabled because they are provided via

VCC1.

•

Stand-alone configuration: The external PNP is disabled when VCC3 < VS,UV if VCC3_VS_ UV_OFF = 0. The

overcurrent limitation is signalled via the bit VCC3_OC according to the selected shunt resistor, VCC3

undervoltage is signalled via the bit VCC3_UV and the regulator is disabled due to VS undervoltage when

VS,UV is reached.

Note: Neither VCC1_SC nor VCC3_UV flags are set during power up of

CC1 or turn on of VCC3 respectively.

15.8

VCC2 Undervoltage and VCAN Undervoltage

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

•

CC2 undervoltage Detection: In case VCC2 will drop below the VCC2,UV,f threshold, then the SPI bit VCC2_UV

is set and can be only cleared via SPI.

•

CAN undvervoltage Detection: In case the voltage on VCAN will drop below the VCAN_UV 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

CC2.

VCC1

tRD1

SBC Normal

tOV_filt

SBC Restart

SBC Normal

VCC1,OV

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