wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 111

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
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14.3.4
If an undervoltage fault or a limit switch overcurrent fault is detected (eg. during start-up, or when
exiting the HIBERNATE state), the WM8350 will respond according to various configurable options.
The Limit Switch and each of the DC Converters and LDO Regulators may be programmed to
shutdown the system in the event of a fault condition. In these events (where a system shutdown is
selected), the WM8350 will either shut down or will attempt to re-start, depending on the state of the
POWERCYCLE register bit.
If POWERCYCLE = 0, then a fault condition will result in the shutdown of the WM8350, reverting to
the OFF state. If POWERCYCLE = 1, then the WM8350 will make a maximum of 8 attempts to re-
start. Each attempt will be scheduled at 200ms intervals. After 8 consecutive failed attempts, the
WM8350 reverts to the OFF state and resets the power cycling counter. Any subsequent start-up
event again has a maximum of 8 attempts to start up (provided that POWERCYCLE = 1).
Table 57 Controlling Power Cycling
14.3.5
The control registers of the WM8350 are reset when it goes into the OFF state. The
REG_RESET_HIB_MODE control bit provides an option to also reset the internal registers when
exiting the HIBERNATE state.
In Development mode, the register reset in OFF can be disabled using the RECONFIG_AT_ON
register field. See Section 14.4 for a definition of this field.
Table 58 Register Reset Control
R3 (03h)
System
Control
R5 (05h)
System
Hibernate
ADDRESS
ADDRESS
REGISTER RESET
POWER CYCLING
BIT
BIT
13
5
POWERCYCL
E
REG_RESE
T_HIB_MOD
E
LABEL
LABEL
DEFAULT
DEFAULT
0
0
Action of the internal register reset signal
when going from Hibernate to Active.
0 = Do not do a register reset when leaving
the hibernate state.
1 = Do a register reset when leaving the
hibernate state
Action to take on a fault (if fault response
is set to shutdown system):
0 = Shut down
1 = Shutdown everything then go through
startup sequence. ie. Reboot the system.
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
WM8350
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