WM8351 datasheet(132/330 Pages) WOLFSON

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WM8351

Production Data

PD, April 2012, Rev 4.5

132

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R183 (B7h)

DC-DC2

Control

DC2_HIB_MO

DC-DC2 Hibernate behaviour:

0 = Continue as in Active state

1 = Disable converter output

9:8

DC2_HIB_TRI

G [1:0]

DC-DC2 Hibernate signal select

00 = HIBERNATE register bit

01 = L_PWR1

10 = L_PWR2

11 = L_PWR3

Note that Hibernate is also selected

when a GPIO Hibernate input is

asserted.

Table 78 Hibernate Mode Control for DC-DC Converter 2

14.6.5

INTERRUPTS AND FAULT PROTECTION

Each DC-DC Converter is monitored for voltage accuracy and fault conditions. An undervoltage

condition is set if the voltage falls below 95% of the required level. The action taken in response to a

fault condition can be set independently for each DC-DC Converter, as described in Table 79.

The DCn_ERRACT fields configure the fault response to disable the respective converter or to shut

down the entire system if desired. In addition, DC-DC Converter fault conditions also generate a

second-level interrupt (see Section 24).

To prevent false alarms during short current surges, faults are only signalled if the fault condition

persists. When a DC-DC Converter is started up, any initial fault condition is ignored until the

Converter has been allowed time to settle. The time for which any fault condition is ignored is set by

the PUTO register field, as described in Table 79.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R181 (B5h) for

DC-DC1

R184 (B8h) for

DC-DC2

R187 (BBh) for

DC-DC3

R190 (BEh) for

DC-DC4

15:14

DCn_ERRAC

T [1:0]

Action to take on DC-DCn fault (as well

as generating an interrupt):

00 = ignore

01 = shut down converter

10 = shut down system

11 = reserved (shut down system)

R177 (B1h)

DCDC Active

options

13:12

PUTO [1:0]

Power up time out value for all

converters

00 = 0.5ms

01 = 2ms

10 = 32ms

11 = 256ms

Note: n

is a number between 1 and 4 that identifies the individual DC-DC converter

Table 79 Fault Responses for DC-DC Converters

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