AN3959 datasheet(49/65 Pages) STMICROELECTRONICS

49 / 65 page

AN3959

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

Doc ID 022081 Rev 3

49/65

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)

●

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

●

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

–

●

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

–

●

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

–

●

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

1 sec

●

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

AN3959 Datasheet(PDF) 49 Page - STMicroelectronics

AN3959 Datasheet(HTML) 49 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

Datasheet Download

Link URL