WM8321 datasheet(133/253 Pages) WOLFSON

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Production Data

WM8321

PD, February 2012, Rev 4.0

133

The WM8321 can also indicate the status of the SYSOK signal via a GPIO pin configured as a “PVDD

Good” output (see Section 21). A GPIO pin configured as “PVDD Good” output will be asserted when

the PVDD is above the SYSOK threshold.

Figure 27 PVDD Monitoring

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16385

(4001h)

PVDD

Control

15:14

SYSLO_ERR_

ACT

SYSLO Error Action

Selects the action taken when SYSLO is

asserted

00 = Interrupt

01 = WAKE transition

10 = Reserved

11 = OFF transition

SYSLO_STS

SYSLO Status

0 = Normal

1 = PVDD is below SYSLO threshold

6:4

SYSLO_THR

[2:0]

010

SYSLO threshold (falling PVDD)

This is the falling PVDD voltage at which

SYSLO will be asserted

000 = 2.8V

001 = 2.9V

…

111 = 3.5V

2:0

SYSOK_THR

[2:0]

101

SYSOK threshold (rising PVDD)

This is the rising PVDD voltage at which

SYSOK will be asserted

000 = 2.8V

001 = 2.9V

…

111 = 3.5V

Note that the SYSOK hysteresis margin is

added to these threshold levels.

Table 78 PVDD Monitoring Control

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