TLE75620-EST datasheet(51/81 Pages) INFINEON

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Datasheet

Rev. 1.0

2017-11-23

TLE75620-EST

SPIDER+ 12V

Diagnosis

Figure 28 Open Load at ON timings (direct channels diagnosis)

9.3.2

Open Load at ON - diagnosis loop

When DIAG_OLONEN.MUX bits are programmed with the value 1010B, the device starts a diagnosis loop

where all auto-configurable (when used as high-side switches) and high-side channels are checked for Open

Load at ON. The internal multiplexer is controlled by the internal logic, therefore there is no need for the

micro-controller to send any additional command.

First the internal logic checks all channels which are directly driven by the micro-controller and not configured

to be driven by the internal PWM generator, then the internal logic checks all channels which are configured

to be driven by the internal PWM generator.

• Diagnosis sequence for channels driven directly by the micro-controller

– First channel checked: channel 0. It is recommended that the channels are ON at least tON before

activating the diagnosis loop.

–After a time tOLONSET + tSYNC the diagnosis for the first channel is completed (DIAG_OLON.OUTn bit is

updated)

– The internal multiplexer is set to the next channel. After a time tOLONSW + tSYNCthe diagnosis is completed

(DIAG_OLON.OUTn bit is updated) for the currently selected channel. This step is repeated for all

remaining directly driven channels.

– If one channel is OFF when the diagnosis is performed, the corresponding DIAG_OLON.OUTn is set to

“0B”

• Diagnosis sequence for channels driven by the internal PWM Generators (see Chapter 7.5)

– These channels are diagnosed only after all channels directly driven by micro-controller are checked

– Channels mapped to PWM Generator 0 are diagnosed first

–After a time tOLONSET the channel activation (switch ON) is the trigger event to perform Open Load at ON

diagnosis for the first channel

–After a time tONMAX + tOLONSW the diagnosis for the first channel is completed (DIAG_OLON.OUTn bit is

updated)

INn

ILn

OpenLoadON_direct.emf

OUT.OUTn

DIAG_OLONEN.MUX

1111

≠ 1111 (ch. n)

tON

tOLONSET

DIAG_OLON.OUTn

SPI readout of

DIAG_OLON.OUTn

IL(OL)

tOLONSW

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