TLE7233EM datasheet(21/33 Pages) INFINEON

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Data Sheet

Rev. 1.2, 2014-05-09

SPI Driver for Enhanced Relay Control

SPIDER - TLE7233EM

Diagnostic Features

The SPI of TLE7233EM provides diagnosis information about the device and about the load. The diagnosis

information of the protective functions of channel n is latched in the diagnosis flag Dn. The open load diagnosis of

channel n is latched in the diagnosis flag OLn. Both flags are cleared by INn =00B which disables the diagnosis

current ID(PD) (a small pull down current) as well.

Following table shows possible failure modes and the according protective and diagnostic action.

8.1

Open Load Diagnosis timing

The TLE7233EM offers an open load diagnosis for each channel in OFF mode.

The time td(OL) is applied to filter short time events.

Figure 9

Open Load timing

Failure Mode

Comment

Open Load

or short circuit to GND

Diagnosis, when channel n is switched on:

INn = 01B: if input pin is high: none

INn = 10B: none

Diagnosis, when channel n is switched off:

INn = 00B: none, diagnosis flags are cleared and the diagnosis current is switched off

INn = 01B: if input pin is low, according to voltage at the output pin, the flag OLn is set

after time td(OL)

INn = 11B: according to voltage level at the output pin, the flag OLn is set after time td(OL)

Over temperature

When over temperature occurs, the affected channel n is switched off. The according

diagnosis flag Dn is set.

The diagnosis flags are latched until they have been cleared by INn = 00B. The over

temperature detection is active in ON-state as well as OFF-state.

Over Load

(Short Circuit)

When over load is detected at channel n, the affected channel is switched off after time

tOFF(OVL) and the dedicated diagnosis flag Dn is set.

The diagnosis flags are latched until they have been cleared by INn = 00B.

OpenLoad.emf

VDS

td(OL)

OLn = 1b

Open Load occures here

VDS

td(OL)

OLn = 1b

VDS(OL)

Open Load occures here

VDS(OL)

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