STV8247T datasheet(92/149 Pages) STMICROELECTRONICS

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STV82x7

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PEAK_DET_R

Peak Level Detector Status Register (R channel)

PEAK_DET_L_R

Peak Level Detector Status Register (L - R)

Bit Name

Reset

Function

OVERLOAD_L[7]

Memorise overload on the peak detection. This field can be reset.

PEAK_L[6:0]

00000000

Displays the Absolute Peak Level 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).

In AM/FM Mono mode, only the PEAK_L[7:0] value must be taken into account.

In FM Mono mode, the audio peak level range depends upon the programmed FM bandwidth.

The unique difference is that the measurement is done after Sound pre-processing (DC offset

removal, Prescaling, De-emphasis and Dematrixing).

In FM Stereo mode, the maximum value may be used to check if the incoming signal level is

correctly adjusted by the prescaling factor or if there are no FM overmodulation problems

(clipping).

Programmable values are listed in Table 20.

Address: 9Fh

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

OVERLOAD_R

PEAK_R[6:0]

Bit Name

Reset

Function

OVERLOAD_R[7]

Memorise overload on the peak detection. This field can be reset.

PEAK_R[7:0]

0000000

Displays the Absolute Peak Level 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).

For more information, refer to register PEAK_DET_L.

Address: A0h

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

OVERLOAD_L_R

PEAK_L_R[6:0]

Bit Name

Reset

Function

OVERLOAD_L_R[7] 0

Memorise overload on the peak detection. This field can be reset.

PEAK_L_R[7:0]

0000000

Displays the Difference between L and R (L - R) channels for the audio source selected.

For more information, refer to register PEAK_DET_L.

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