TLE8110EE Datasheet, PDF (33/72 Pages) Infineon Technologies AG – Smart Multichannel Low Side Switch with Parallel Control and SPI Interface

FLEX
Smart Multi-Channel Switch
Diagnosis
Diagnosis Blind Time [DBT] activation
DBT is triggered by Open Load [OL] or Short-to-Ground [SG] -detection during OFF-condition of CH7-10.
DBT is activated by DEVS.DBT1, DEVS.DBT2 (see „Control of the device“).
INx Signal
ON
Channel 7 - 10
OFF
OL, SG -Diagnosis active
Output
Voltage
Diagnosis Blind Time
[DBT]
triggered by
Diagnostic Incident
DBT
„Blind“ window finishes as
soon as the error
disappears within the DBT
t_err<
t_{D BT}
t_err<
t_{D BT}
t_{err >}
t_DBT
Diagnosis Blind Time
[DBT]
active
11
11
11
00
Figure 17 Diagnosis Blind Time
Incident - e.g.
temporal „short to GND“
[SG]
Diagnostic Register Entry,
because Failure present
after ending DBT
Diagnosis Register :
11: No Error
10: Over Load
01: Open Load
00: Short to Ground
DBT.vsd
Channel
OFF
YES
OL, SG-
Error
present?
YES
OL, SG-
Error
detected
DBT
Counter
SET 0 = tDBT
Decrement
DBT Counter
OL, SG-
Error
present?
Yes
Reset Counter
No
(finish DBT-
frame)
No
Counter
t > tDBT
Yes
Failure detected
=> Register Entry
Figure 18 Diagnosis Blind Time - Logic Flow
DBT_Flow. vsd
Data Sheet
33
Rev. 1.0, 2009-06-15