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TLE7233G Datasheet, PDF (20/32 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control
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SPI Driver for Enhanced Relay Control
SPIDER - TLE7233G
Diagnostic Features
8
Diagnostic Features
The SPI of TLE7233G 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 and the diagnosis current ID(PD),
which is a small pull down current, is disabled.
Following table shows possible failure modes and the according protective and diagnostic action.
j
Failure Mode
Comment
Open Load
Diagnosis, when channel n is switched on:
or short circuit to GND INn = 01B: if input pin is high: none
INn = 10B: none
Over temperature
Over Load
(Short Circuit)
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, flags OLn are set after time td(OL)
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.
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.
8.1
Open Load Diagnosis timing
The TLE7233G offers a open load diagnosis for each channel in OFF mode.
The time td(fault) is applied to filter short time events.
Open Load occures here
IN
VD S
V D S (OL)
t d(fault)
OL = 1
n
b
Figure 9 Open Load timing
IN
t
VDS
VDS (OL)
t
Open Load occures here
t
td(fault)
t
OL = 1
n
b
OpenLoad.emf
Datasheet
20
Rev. 1.0, 2008-02-28
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