STA311B datasheet(89/102 Pages) STMICROELECTRONICS

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STA311B

Configuration registers (0x77; 0x78; 0x79)

102

9.5.7

Zero-mute threshold/hysteresis and RMS zero-mute selectors (0x6F)

Zero-mute (0x6F)

The STA311B implements an RMS-based zero-detect function (on serial input interface

data) able to detect in a very reliable way the presence of an input signal, so that the power

bridge outputs can be automatically connected to ground. When active, the function will

mute the output PWM when the input level become less than threshold - hysteresis.

Once muted, the PWM will be unmuted when the input level is detected greater than

threshold + hysteresis.

The measured level is then reported (each input channel is selected by RMSZS[2:0] value)

on registers 0x7A, 0x7B.

Bit

RST

Name

Description

7RW

Reserved

6RW

5RW

CHxHCT[5:0]

see Table 21

4RW

3RW

2RW

1RW

0RW

RMSZS2

RMSZS1

RMSZS0

ZMTHS2

ZMTHS1

ZMTHS0

ZMHYS1

ZMHYS0

000

Bit

RST

Name

Description

RMSZS2

Select channel for reading the zero-mute RMS

level on registers rmsZMH (0x7A) & rmsZML

(0x7B).

RMSZS1

RMSZS0

4RW

ZMTHS2

Select the zero-mute threshold level. If signal is

below this level, output will be in switch off mode.

3RW

ZMTHS1

2RW

ZMTHS1

ZMHYS1

Select the hysteresis window width.

ZMHYS0

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