TLE9222 datasheet(19/43 Pages) INFINEON

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Data Sheet

Rev. 1.0 2015-06-12

TLE9222

Functional Description

4.7

Fail Safe Functions and Flags

In addition to power supply undervoltage detection, the TLE9222 provides several functions for detection of

local or remote failures with corresponding status flags. These errors are signalled with the ERRN output and

can be read out from the status register. When local errors are detected, the TLE9222 initiates fail safe

procedures for device self protection and prevention of communication channel interruption.

4.7.1

Overtemperature detection

The transmitter of the TLE9222 is protected against overtemperature events when active in BD_Normal mode.

If the junction temperature rises above the TJ(warning) threshold the temperature-warning flag in the status

transmitter will be disabled and the overtemperature event will be flagged by the temperature-high flag in the

status register and signalled with the ERRN output.

Figure 13 Overtemperature protection

4.7.2

Bus Error Detector

The bus error detector monitors the FlexRay bus for identifying external failures which may lead to corrupt

data transmission and reception. With the RxD-TxD compare function and the bus overcurrent monitoring,

bus errors are detected and signalled with the bus error flag. The bus error detector is only enabled in

BD_Normal mode while the transmitter is active.

TLE9222_OVERTEMPERATURE_V00

High

Low

High

Low

High

Low

TJ(Warning)

TJ(Shut_Down)

dReactionTimeERRN

Temperature-warning flag set

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