WM8352
Production Data
DESCRIPTION
ADDRESS
BIT
LABEL
DEFAULT
R183 (B7h) for
DC-DC2
12
DCn_HIB_MO
DE
0
DC-DCn Hibernate behaviour:
0 = Continue as in Active state
1 = Disable converter output
DC-DCn Hibernate signal select
00 = HIBERNATE register bit
01 = L_PWR1
R192 (C0h) for
DC-DC5
9:8
DCn_HIB_TRI
G [1:0]
00
10 = L_PWR2
11 = L_PWR3
Note that Hibernate is also selected
when a GPIO Hibernate input is
asserted.
Note: n is either 2 or 5 and identifies the individual DC-DC converter
Table 78 Hibernate Mode Control for DC-DC Converters 2 and 5
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
R181 (B5h) for
DC-DC1
BIT
LABEL
DEFAULT
DESCRIPTION
15:14
DCn_ERRAC
T [1:0]
00
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)
R184 (B8h) for
DC-DC2
R187 (BBh) for
DC-DC3
R190 (BEh) for
DC-DC4
R193 (C1h) for
DC-DC5
R196 (C4h) for
DC-DC6
R177 (B1h)
DCDC Active
options
13:12
PUTO [1:0]
00
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 6 that identifies the individual DC-DC converter
Table 79 Fault Responses for DC-DC Converters
PD, February 2011, Rev 4.4
132
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
