WM9714L datasheet(66/120 Pages) CIRRUS

66 / 120 page

WM9714L

Rev 4.0

MEASUREMENT TYPES

The ADCSEL control bits determine which type of measurement is performed (see below).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

74h

ADCSEL_AUX4

AUX4 Measurement Enable Control

0 = Disable AUX4 measurement (pin 12)

1 = Enable AUX4 measurement (pin 12)

ADCSEL_AUX3

AUX3 Measurement Enable Control

0 = Disable AUX3 measurement

(SPKVDD/3)

1 = Enable AUX3 measurement

(SPKVDD/3)

ADCSEL_AUX2

AUX2 Measurement Enable Control

0 = Disable AUX2 measurement (pin 30)

1 = Enable AUX2 measurement (pin 30)

ADCSEL_AUX1

AUX1 Measurement Enable Control

0 = Disable AUX1 measurement (pin 29)

1 = Enable AUX1 measurement (pin 29)

Note: Only one bit in 74h[7:4] should be set at any one time

Table 48 AUX ADC Control (Measurement Types)

The WM9714L performs a single measurement

– either in polling mode or continuously, as indicated

by the CTC bit. The type of measurement is specified by the ADCSEL[7:4] bits. Only one of the

ADCSEL[7:4] bits should be set.

CONVERSION RATE

The AUXADC conversion rate is specified by the CR bits (reg 76h).

CR may be set to 93.75Hz (every 512 AC-Link Frames), 120Hz (every 400 AC-Link Frames),

153.75Hz (every 312 AC-Link frames) or 187.5Hz (every 256 AC-Link frames).

If only one ADRSEL[7:1] bit is set, each individual conversion occurs at the rate specified by CR.

If multiple ADRSEL[7:1] bits are set, the complete set of conversions requested is completed at the

rate specified by CR.

DATA READBACK

AUXADC measured data is stored in register 7Ah, and can be retrieved by reading the register in the

usual manner (see

“AC97 Interface”). Additionally, the data can also be passed to the controller on

one of the AC-Link time slots not used for audio functions.

The output data word of the AUX ADC interface consists of three parts:



1 Unused bit (Ignore).



Output data from the AUX ADC (12 bits)



ADCSRC: 3 additional bits that indicate the source of the ADC data.

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