WM8962B datasheet(91/295 Pages) WOLFSON

91 / 295 page

WM8962

Rev 4.3

DRC SIGNAL ACTIVITY DETECT

The DRC incorporates a configurable signal detect function, allowing the signal level at the DRC input

to be monitored and to be used to trigger other events. This can be used to detect the presence of a

microphone signal on an ADC channel, or can be used to detect an audio signal received over the

digital audio interface.

The Peak signal level or the RMS signal level of the DRC input can be selected as the detection

threshold. When the threshold condition is exceeded, an interrupt or GPIO output can be generated.

See “General Purpose Input/Output (GPIO)” and “Interrupts” for further details.

When the DRC is enabled, then signal activity detection can be enabled by setting the

DRC_SIG_DET register bit. The applicable threshold can be defined either as a Peak level (Crest

Factor) or an RMS level, depending on the DRC_SIG_DET_MODE register bit. When Peak level is

selected, the threshold is determined by DRC_SIG_DET_PK, which defines the applicable Crest

Factor (Peak to RMS ratio) threshold. If RMS level is selected, then the threshold is set using

DRC_SIG_DET_RMS. These register fields are described in Table 45.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R276 (0114h)

DRC1

14:10

DRC_SIG_DET_

RMS [4:0]

00000

DRC Signal Detect RMS Threshold.

This is the RMS signal level for signal

detect to be indicated when

DRC_SIG_DET_MODE=1.

00000 = -27dB

00001 = -28.5dB

…. (1.5dB steps)

11110 = -72dB

11111 = -73.5dB

9:8

DRC_SIG_DET_

PK [1:0]

DRC Signal Detect Peak Threshold.

This is the Peak/RMS ratio, or Crest

Factor, level for signal detect to be

indicated when

DRC_SIG_DET_MODE=0.

00 = 14dB

01 = 20dB

10 = 26dB

11 = 32dB

DRC_SIG_DET_

MODE

DRC Signal Detect Mode

0 = Peak threshold mode

1 = RMS threshold mode

DRC_SIG_DET

DRC Signal Detect Enable

0 = Disabled

1 = Enabled

Table 45 DRC Signal Activity Detect GPIO/Interrupt Control

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