AN3959 datasheet(49/65 Pages) STMICROELECTRONICS

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AN3959

Software setup to use the STA381BW/STA381BWS devices (ST Map)

Doc ID 022081 Rev 3

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7.5

Short-circuit protection for the STA381BW/STA381BWS

The device is protected to short circuit at power-on:

●

Enable the short-circuit check enable bit (SHEN, bit D0 register 0x4C)

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When the device switches from EAPD = 0 to EAPD = 1 (bit D7 register 0x05), the

protection checks the short-circuit

●

It is possible to verify the short, reading register 0x47

–

Bit D0 = 0 (OUTSH) means that OUT1B is shorted to OUT2A

–

Bit D1 = 0 (VCCSH) means that one output pin is shorted with Vcc

–

Bit D2 = 0 (GNDSH) means that one output pin is shorted with GND

●

This function is verified ONLY when EAPD toggles from 0 to 1

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The feature is enabled in BTL mode. It is not effective in single-ended mode

7.6

Settings for bridge power-up

●

Switch on the bridge

–

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Change master volume to desired value (e.g. 0 dB)

–

●

Change channel volume to desired value (e.g. +3 dB)

–

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By default, the timing between the bridge power-on in seconds and the real bridge on is

1 sec

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To modify this timing it is mandatory to change the value in register 0x2B and 0x2C

–

The default value is 0x300C (= 12300)

–

The timing is 12300 * 0.083 * 10-3 = 1.0209 sec

●

For example, to have 100 msec for power-on, the number that must be witten in register

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