WM8351 datasheet(176/330 Pages) WOLFSON

176 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

176

19.6 DIGITAL COMPARATORS

The WM8351 has four digital comparators which may be used to compare AUXADC measurement

data against programmable threshold values. Each comparator has an associated interrupt flag, as

described in Section 19.7, 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 119.

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

selects one of the eight AUXADC channels for each comparator. Note that, 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.

The DCMPn_GT register bits select whether an interrupt will be indicated when the measured value is

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

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

scaling and voltage reference as the associated AUXADC channel source.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R12 (0Ch)

Power Mgmt (5)

R163 (A3h)

Generic

Comparator

Control

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

R164 (A4h)

Generic

comparator 1

R165 (A5h)

Generic

Comparator 2

R166 (A6h)

Generic

Comparator 3

R167 (A7h)

Generic

Comparator 4

15:13

DCMPn_SRCSE

L [2:0]

000

DCOMPn source select.

000 = AUX1

001 = AUX2

010 = AUX3

011 = AUX4

100 = USB

101 = LINE

110 = BATT

111 = TEMP

DCMPn_GT

DCOMPn interrupt control

0 = interrupt when the source is

less than threshold

1 = interrupt when the source is

greater than threshold

11:0

DCMPn_THR

[11:0]

000h

DCOMPn threshold

(12-bit unsigned binary number)

Note: n

is a number between 1 and 4 that identifies the individual comparator

Note:

The Comparator Enable bits can each be accessed through two separate control registers.

Reading from or writing to either register location has the same effect.

Table 119 AUXADC Digital Comparator Control

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