WM8948ECSSLASHR datasheet(92/189 Pages) WOLFSON

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WM8948

Production Data

PD, May 2011, Rev 4.1

AUXADC READBACK

Measured data from the AUXADC is read via the AuxADC Data Register (R60), which contains two

fields. The AUXADC Data Source is indicated in the AUX_DATA_SRC field; the associated

measurement data is contained in the AUX_DATA field.

Reading from the AuxADC Data Register returns a 12-bit code which represents the most recent

AUXADC measurement on the associated channel. It should be noted that every time an AUXADC

measurement is written to the AuxADC Data Register, the previous data is overwritten - the host

processor should ensure that data is read from this register before it is overwritten.

The 12-bit AUX_DATA field can be equated to the actual voltage by scaling according to the

applicable reference source. The full-scale value of AUX_DATA corresponds to the LDOVDD voltage

level.

The AUXADC interrupts can be used to indicate when new data is available - see “Interrupts”. A

GPIO pin configured as “AUX_DONE” can also be used to indicate when new data is available - see

“General Purpose Input / Output”.

In a typical application, it is anticipated that the AUXADC Interrupt or GPIO flag would be used to

control the AUXADC readback - the host processor should read the AUXADC Data Register in

response to the AUXADC event. In Automatic AUXADC mode, the processor should complete this

action before the next measurement occurs, in order to avoid losing any AUXADC samples. In

Manual conversion mode, the interrupt signal provides confirmation that the commanded

measurement has been completed.

The control fields associated with AUXADC readback are defined in Table 59.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R60 (3Ch)

Aux ADC Data

13:12

AUX_DATA_

SRC [1:0]

AUXADC Data Source

00 = No measurement

01 = AUX1

10 = AUX2

11 = SPKVDD

11:0

AUX_DATA

[11:0]

000h

AUXADC data

(12 bit unsigned data)

Table 59 AUXADC Readback

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