cs4412 Cirrus Logic, Inc., cs4412 Datasheet - Page 17

• Manufacturer Part Number: cs4412
• Description: 30 W Quad Half-bridge Digital Amplifier Power Stage Logic
• Manufacturer: Cirrus Logic, Inc.

DS749A1
4.5
4.5.1
4.5.2
Device Protection and Error Reporting
The CS4412 has built-in protection circuitry for over-current, under-voltage, and thermal warning/overload
conditions. The levels of the over-current error, thermal error, and VP under-voltage trip points are listed
in the
of these preset thresholds are crossed.
Each error and warning pin implements an active-low open-drain driver and requires an external pull-up
for proper operation.
Over-current Protection
Over-current errors are reported on the ERROCx/y pins. For example, an over-current error on OUT1 is
reported by the ERROC1/2 pin. The power output of the channel which is reporting the over-current con-
dition will be set to high-impedance until the error condition has been removed and the RSTx/y signal for
that channel has been toggled from low to high.
Thermal Warning, Thermal Error, and Under-Voltage Error
Table 7
junction thermal warning trip point, the TWR pin will be set low. If the junction temperature continues to
increase beyond the junction thermal error trip point, the ERRUVTE pin will be set low. If the voltage on
VP falls below the VP under-voltage error trip point, ERRUVTE will be set low.
When the thermal error or VP under-voltage trip point is crossed, all power outputs will be set to high-
impedance until the error condition has been removed and the RSTx/y signals have been toggled from
low to high.
PWM Power Output Characteristics
shows the behavior of the TWR and ERRUVTE pins. When the junction temperature exceeds the
TWR
0
0
1
1
ERROCx/y
ERRUVTE
0
1
0
1
0
1
Table 7. Thermal and Under-Voltage Error Conditions
Thermal warning and thermal error and/or under-voltage error.
Thermal warning only.
Under-voltage error.
Junction temperature and VP voltage within normal limits.
Table 6. Over-current Error Conditions
Over-current error on channel x or channel y.
Operating current of channel x and y within allowable limits.
table on
page
Reported Condition
Reported Condition
6. Automatic shut-down will occur whenever any
CS4412
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