STA321MPL1 datasheet(67/80 Pages) STMICROELECTRONICS

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STA321MPL1

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

6.5.8

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

Zero-mute (0x6F)

The STA321MPL1 implements an RMS-based zero-detect function (on serial input interface

data) which is 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 mutes the output PWM when the input level becomes less than the threshold

- hysteresis.

Once muted, the PWM “unmutes” when the input level is detected as greater than the

threshold + hysteresis.

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

value) on registers 0x7A and 0x7B.

Table 15. RMS channel select

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) and 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

RMSZS[2:0]

Channel

000

001

010

011

100

101

110

111

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