BM28723AMUV
Description of Function - continued
13 Protection Function
About ERRORX pin (Pin 13)
If LSI detects Output short protection or DC voltage protection or high temperature protection, LSI informs abnormality with
ERRORX pin as Low level in the protection function operation. This is a function indicating the abnormal condition of this
product.
ERRORX pin does not become Low in the case of detecting Under voltage protection or Clock stop protection.
Protection
Function
Speaker
ERRORX
Detecting & Releasing Condition
PWM Output Output(Note 20)
Detecting current=10A (Typ)/5A (Min, Tj=85°C)
/3.9A (Min, Tj=150°C)
Output Short
Protection
Detecting
condition
High-Z_low
Low
(Latch)
(Latch) (Note 21)
DC Voltage
Protection
Detecting PWM output Duty ratio=0% or 100%
High-Z_low
Low
(Latch)
condition
for 42ms (Typ, fS=48kHz) and over
(Latch) (Note 21)
Detecting
condition
Chip temperature to be more than 150°C (Min)
High-Z_low
High
Temperature
Protection
Low
Releasing
condition
Normal
operation
Chip temperature to be less than 120°C (Min)
Detecting Power supply voltage to be below
condition 7.0V (Typ)/6.0V (Min)/8.0V (Max)
High-Z_low
Under Voltage
Protection
High
Releasing Power supply voltage to be above
Normal
condition
7.5V (Typ)/6.5V (Min)/8.5V (Max)
operation
BCLK signal has stopped more than constant period
of time.
LRCLK signal has stopped more than constant period
of time.
BCLK frequency becomes lower than constant
frequency speed.
BCLK frequency becomes higher than constant
frequency speed.
Detecting
condition
High-Z_low
Clock Stop
Protection
Clock stop protection is detected if any of the
condition described above happens.
Refer to P.58 to P.61.
High
LRCLK has not stopped more than constant period
of time. And BCLK frequency keeps between the
Releasing constant frequency speed more than maximum
condition 60ms. Refer to P.58 to P. 61.
Normal
operation
(Note 20) The ERRORX pin is Nch open-drain output. The ERRORX output pin should be pulled-up by external resistor.
(Note 21) Once LSI is latched, the circuit will not be released automatically even after the abnormal condition has been removed.
The following procedure is available for recovery.
To let LSI return from latch state, set MUTEX pin to Low once for more than PWM stop time and then return it back to high.
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