Production Data
WM8352
Figure 64 WM8352 Operating State Diagram
14.2.1 HIBERNATE STATE SELECTION
The WM8352 moves from the ACTIVE to the HIBERNATE state when the HIBERNATE register bit is
set. It can also move to hibernate using the Hibernate Edge or the Hibernate Level function from the
GPIOs.
It returns to the ACTIVE state when the Hibernate Level GPIO function is reset and the HIBERNATE
bit is set to 0. It can also return to ACTIVE via the Hibernate Edge function or when a wake-up event
(see Section 14.3.1) occurs.
If a fault condition occurs in the HIBERNATE state, the WM8352 moves to the OFF state.
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R5 (05h)
15
HIBERNATE
0
Determines what state the chip should
operate in.
System
Hibernate
0 = Active state
1 = Hibernate state
The register bit defaults to 0 when a reset
happens
Table 55 Invoking HIBERNATE State
The behaviour of the WM8352 in the HIBERNATE state is programmable in terms of supply voltage
generation, interrupts and resets. Fast battery charging is disabled in the HIBERNATE state, but
trickle charging is possible.
PD, February 2011, Rev 4.4
107
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
