TLE7237SL Datasheet, PDF (22/36 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control

SPI Driver for Enhanced Relay Control
TLE7237SL
Diagnostic Features
8
Diagnostic Features
The SPI of TLE7237SL 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 flags Dn. It is cleared by the SPI
command CMD.CPL = 1. The CPL command clears itself with the next valid SPI communication frame.
The open load diagnosis of channel n is latched in the diagnosis flag OLn. This flag is cleared by reading the
according diagnosis register.
Following table shows possible failure modes and the according protective and diagnostic action.
Failure Mode
Open Load
Over Temperature
Over Load
(Short Circuit)
Comment
Diagnosis, when channel n is switched on: none
Diagnosis, when channel n is switched off: according to voltage level at the
output pin, flag OLn is set after time t_d(OL).
A diagnosis current can be enabled by SPI command DCCR.DCENn = 1.
When over temperature occurs, the according diagnosis flag Dn is set. If the
affected channel n was active it is switched off.
The diagnosis flags are latched until they have been cleared by SPI
command CMD.CPL = 1.
When over load is detected at channel n, the affected channel is switched
off after time t_OFF(OVL) and the dedicated diagnosis flag Dn is set.
The diagnosis flags are latched until they have been cleared by SPI
command CMD.CPL = 1.
Data Sheet
23
Rev. 1.0, 2010-02-18