Datasheet

Data Sheet 18 Rev. 1.0, 2008-03-18
BTS4130QGA
Diagnostic Mechanism
7 Diagnostic Mechanism
For diagnosis purpose, the BTS4130QGA provides status pin.
7.1 ST 0/1/2/3 Pin
BTS4130QGA status pins are an open drain, active low circuit. Figure 12 shows the equivalent circuitry. As long
as no “hard” failure mode occurs (Short circuit to GND / Over temperature or open load in OFF), the signal is
permanently high, and due to a required external pull-up to the logic voltage will exhibit a logic high in the
application. A suggested value for the
R
PU ST01
is 15 kΩ.
.
Figure 12 Status output circuitry
7.2 ST0/1/2/3 Signal in Case of Failures
Table 2 gives a quick reference for the logical state of the ST 0/1/2/3 pins during device operation.
Table 2 ST 0/1 2/3 truth table
Device operation IN0/2 IN1/3 OUT0/2 OUT1/3 ST 0/1
ST2/3
Normal operation L L L L H
L H L H
H L H L
H H H H
Open Load channel 0/2 L X > V
(OL)
X L
1)
1) L if potential at the output exceeds the Openload detection voltage
H X H X H
Open Load channel 1/3 X L X > V
(OL)
L
1)
X H X H H
Over temperature both channel L L L L H
X H X L L
H X L X L
Over temp channel 0/2 L X L X H
H X L X L
Over temp channel 1/3 X L X L H
X H X L L
ST pin quad shared
diag.v sd
GND
ST 0/1
or
ST 2/3
R
ST 0/1
R
ST 2/3
ZD
ESD
R
PU ST 0/1
R
PU ST 2/3
V
ccµC
OR
Channel 0 or 2
Diagnostic
Logic
Channel 1 or 3
Diagnostic
Logic