WM8321 datasheet(100/253 Pages) WOLFSON

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WM8321

Production Data

PD, February 2012, Rev 4.0

100

18.4 DIGITAL COMPARATORS

The WM8321 has four digital comparators which may be used to compare AUXADC measurement

data against programmable threshold values. Each comparator has a status bit, and also an

associated interrupt flag (described in Section 18.5), which indicates that the associated data is

beyond the threshold value.

The digital comparators are enabled using the DCMPn_ENA register bits as described in Table 45.

After an AUXADC conversion, the measured value is compared with the threshold level of any

associated comparator(s). Note that this comparison is only performed following a conversion.

The source data for each comparator is selected using the DCMPn_SRC register bits; this selects

one of the AUXADC channels for each comparator. If required, the same AUXADC channel may be

selected for more than one comparator; this would allow more than one threshold to be monitored on

the same AUXADC channel. Note that the Backup Battery voltage input can only be monitored using

DCMP4.

The DCMPn_GT register bits select whether the status bit and associated interrupt flag will be

asserted when the measured value is above the threshold or when the measured value is below the

threshold. The output of the most recent threshold comparison is indicated in the DCOMPn_STS

fields.

The threshold DCMPn_THR is a 12-bit code for each comparator. This field follows the same voltage

or temperature coding as the associated AUXADC channel source (see Section 18.3).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16432 (4030h)

Comparator

Control

DCOMP4_STS

Digital Comparator 4 status

0 = Comparator 4 threshold not

detected

1 = Comparator 4 threshold detected

(Trigger is controlled by DCMP4_GT)

DCOMP3_STS

Digital Comparator 3 status

0 = Comparator 3 threshold not

detected

1 = Comparator 3 threshold detected

(Trigger is controlled by DCMP3_GT)

DCOMP2_STS

Digital Comparator 2 status

0 = Comparator 2 threshold not

detected

1 = Comparator 2 threshold detected

(Trigger is controlled by DCMP2_GT)

DCOMP1_STS

Digital Comparator 1 status

0 = Comparator 1 threshold not

detected

1 = Comparator 1 threshold detected

(Trigger is controlled by DCMP1_GT)

DCMP4_ENA

Digital Comparator 4 Enable

0 = Disabled

1 = Enabled

DCMP3_ENA

Digital Comparator 3 Enable

0 = Disabled

1 = Enabled

DCMP2_ENA

Digital Comparator 2 Enable

0 = Disabled

1 = Enabled

DCMP1_ENA

Digital Comparator 1 Enable

0 = Disabled

1 = Enabled

R16433 (4031h)

15:13

DCMP1_SRC

[2:0]

000

Digital Comparator 1 source select

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