ML22Q533 datasheet(36/178 Pages) ROHM

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FEDL22Q53X-02

ML22Q53X

 SPP pin and SPM pin short detection

Set the SPP pin and SPM pin short detection with the SPDEN bit of the SAFE command.

Detects short circuit between SPP pin and SPM pin, or SPP pin and GND (ground fault), or SPM pin and GND (ground

fault). Can be used when SPVDD ≥ 4.5V. Operation is started by analog power-up in the speaker amplifier output mode by

the AMODE command, and operation is terminated by power-down in the speaker amplifier output mode by the AMODE

command.

After inputting SAFE command, start the analog power-up operation by AMODE command within 10ms.

When a short-circuit is detected, the error bit (SPDERR) is set to "1". When using a class D amplifier with the DAMP bit of

AMODE command set to "1", if the PWM output is fixed to "H" level for 62.5

μs or longer, the error bit (SPDERR) is set to

"1". At the same time, the speaker amplifier output pin (SPP/SPM) is forcibly turned off. Read the error bit (SPDERR) with

the RDERR command, end playback, and perform analog power-down with the AMODE command. Then, use ERRCL

command to clear the error bit (SPDERR).

To restart playback, use the AMODE command to analog power-up the speaker amplifier output mode and enter the PLAY

command. However, if shorting to ground continues, the error bit (SPDERR) is set to "1" and the speaker amplifier output pin

(SPP/SPM) is forcibly turned off simultaneously.

Short detection prevents damage to LSI. However, the detection circuit is effective in preventing damage due to

unexpected accidents. It does not support continuous short operation or transient use.

*1 Set 1 SPDEN = "1"

*2 Analog power-up in speaker amplifier output mode

*3 Analog power-down in speaker amplifier output mode

*4 Misoperation detection and failure detection outputs are selected by OUTSTAT command.

Command

STATUSn

(n：1 or 2)

SPP

SPM

Status

SPVDD

SPGND

SPVDD

SPGND

analog power-down

speaker power-down

analog power-up

speaker power-up

HiZ

SPP pin and SPM pin short detection

is operating

SPDERR

Short detection

PUP

SAFE

AMODE

ERRCL

AMODE

RDERR

analog power-down

speaker power-down

analog power-up，speaker power-up

SPP pin and SPM pin short detection

is operating

HiZ

SPDEN

10ms

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