TDA7476_01 Datasheet, PDF (5/19 Pages) STMicroelectronics – CAR RADIO DIAGNOSTIC PROCESSOR

TDA7476
ELECTRICAL CHARACTERISTICS (continued)
(V_s = 14.4V; T_amb = 25°, unless otherwise specified.)
Symbol
Parameter
Test Condition
Aol Open load det. (voltage across High side driver ON
the sensing resistor. Below this
limit the Aux pin is considered in
Open Load condition)This
condition must be true for a time
higher than Tdel
Anop
Normal Operation det. (Voltage
across the sensing resistor.
Within these limits the load
resistance connected to the Aux
pin is considered correct)
PERMANENT DIAGNOSTIC - ACQUISITION TIME DELAY
Tdel
Acquisition time delay - The fault
is considered true if the fault
condition are present for more
than Tdel without interruption
PERMANENT DIAGNOSTIC - WARNING PIN
V_sat Saturation voltage on pin 5
Sink Current at Pin 5 = 1mA
ADDRESS SELECT
V_ADD Voltage on pin 4
Address 0100010X
Address 0100011X
I²C BUS INTERFACE
f_SCL Clock Frequency
V_IL Input Low Voltage
V_IH Input High Voltage
V_SAT Sat Voltage at pin 2
Sink Current at Pin 2 = 5mA
Min. Typ. Max. Unit
0.085 V
0.125
0.5
V
2
s
1
V
1.5
V
3
5
V
400 KHz
1.5
V
3
V
1.5
V
WORKING PRINCIPLES
Figure 1.
Turn-on diagnostic - CH1, CH2, CH3, CH4, CH5 -
I(mA)
Shorted load/open load detection
s To detect a short across the load or an open ^ISOURCE
load, a subsonic current pulse is generated. The
information related to the status of the outputs is
I_SINK
measured and memorized at the top of the
current pulse (tm in fig.1). The current is
sourced by the positive pins (CH1+,...CH5+)
and it is sunk by the corresponding negative
pins (CH1-,...CH5-).
t_m
t_s
D97AU571
t_(ms)
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