CRD4412 Cirrus Logic, Inc., CRD4412 Datasheet - Page 18

• Manufacturer Part Number: CRD4412
• Description: 60 W Quad Half-bridge Digital Amplifier Power Stage
• Manufacturer: Cirrus Logic, Inc.

18
4.5
4.5.1
4.5.2
Protection and Error Reporting
The CS44130 has built-in protection circuitry for over-current, under-voltage, and thermal warning/overload
conditions. All error outputs are open-drain, active low, and can safely be tied together in any combination.
These pins also have internal pull-up resistors, alleviating the need for external resistors.
Over-Current Protection
Over-current errors are reported on the ERROCx/y pins (example: over-current error on OUT1 would be
reported on ERROC1/2). The over-current error is designed to go low for conditions that could potentially
damage the part. In order for ERROCx/y to go low only under conditions that could damage the part, it is
recommended that a 60 k Ω resistor be connected from the OCREF pin to ground. If the part has been
configured for latched shutdown, as specified in
over-current condition will be shut down (OUTx set to HI-Z) until the error condition has been removed
and the RSTx/y for that channel has been cycled from low to high.
If the part has been configured for auto-reset, as specified in
reporting the over-current condition will be shut down (OUTx set to HI-Z). After approximately 85 millisec-
onds, the part will try to re-enable the outputs. If the fault has been cleared, the unit will return to normal
operation. If the fault is still present, the outputs will remain disabled and the part will try again in approx-
imately 85 milliseconds. After 5 unsuccessful attempts, the outputs will latch in the off (OUTx set to HI-Z)
condition and wait for RSTx/y to be reset.
Under-Voltage and Thermal Protection
Table 6
Junction Thermal Warning Trip Point (T
the TWR pin will be set low. If the junction temperature continues to increase beyond the Junction Over-
temperature Trip Point (T
pin will be set low. If the voltage on VP falls below the VP Under-voltage Trip Point (V
the
If the part has been configured for auto-reset, as specified in
reporting the over-current condition will be shut down (OUTx set to HI-Z). After approximately 85 millisec-
onds, the part will try to re-enable the outputs. If the fault has been cleared, the unit will return to normal
operation. If the fault is still present, the outputs will remain disabled and the part will try again in approx-
imately 85 milliseconds. After 5 unsuccessful attempts, the outputs will latch in the off (OUTx set to HI-Z)
condition and wait for RSTx/y to be reset.
“PWM Output Characteristics” on page
TWR
0
0
1
1
shows the behavior of the TWR and ERRUVTE pins. When the junction temperature exceeds the
ERRUVTE
ERROCx/y
0
1
0
1
Table 6. Thermal and Under-Voltage Error Conditions
0
1
OT
, as specified in the
Thermal warning and thermal error and/or under-voltage error.
Thermal warning only.
Under-voltage error.
Normal operation.
Table 5. Over-Current Error Conditions
Over-current error on channel x or channel y
Normal operation
TW
, as specified in the
9), ERRUVTE will be set low.
“PWM Output Characteristics” on page
Error Condition
Table 1 on page
Error Condition
“PWM Output Characteristics” on page
Table 1 on page
Table 1 on page
15, the channel which is reporting the
15, the channel which is
15, the channel which is
UV
9), the ERRUVTE
, as specified in
CS44130
DS690PP1
9),