STV82X8 datasheet(87/157 Pages) STMICROELECTRONICS

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STV82x8

PEAK_DETECTOR

Peak Detector

PEAK_L

Peak Detector Left Channel

Address: 9Bh

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PEAK_L_R_RANGE[2:0]

PEAK_DET_INPUT[2:0]

PEAK_DETEC

TOR_ON

Bit Name

Reset

Function

Bits[7]

Reserved.

PEAK_L_R_RANG

E[2:0]

000

Control the sensitivity of the “Left - Right” peak measurement (register 0x9E).

The difference between Left and Right signal is sometime very small (in case of mono input for

example), so we can multiply the “Left - Right” peak measurement in order to add precision:

000:

Left - Right

100:

(Left - Right) x 16

001:

(Left - Right) x 2

101:

(Left - Right) x 32

010:

(Left - Right) x 4

110:

(Left - Right) x 64

011:

(Left - Right) x 8

111:

(Left - Right) x 128

PEAK_DETECTOR

_INPUT[2:0]

000

Select the input on which the peak detector makes the measurement:

000:

demod signal

100:

SCART signal

001:

I2S0 signal

101:

reserved

010:

I2S1 signal

110:

reserved

011:

I2S2 signal

111:

reserved

PEAK_DETECTOR

_ON

Control the Peak detector:

Peak detector OFF

Peak detector ON

Address: 9Ch

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

OVERLOAD_L

PEAK_L[6:0] (S)

Bit Name

Reset

Function

OVERLOAD_L

This bit is set to 1 by the DSP when the Left peak detector reaches its maximum value (0x7F).

It can be reset to 0.

PEAK_L[6:0]

000 0000

Displays the Absolute Peak Level of the Left channel of the audio source selected. The measured

value is updated continuously every 64 ms. The range varies linearly from the full scale (0 dB)

down to 1/256 of the full scale (-48 dB).

000 0000:<-36dBFS

000 1111:-18dBFS

...

000 0001:-36dBFS

001 1111:-12dBFS

...

000 0011:-30dBFS

011 1111:-6dBFS

...

000 0111:-24dBFS

111 1111:0dBFS

...

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