WM8350GEB/RV Wolfson Microelectronics, WM8350GEB/RV Datasheet - Page 111

• Manufacturer Part Number: WM8350GEB/RV
• Description: Audio CODECs Audio CODEC plus pwr management
• Manufacturer: Wolfson Microelectronics

Specifications of WM8350GEB/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 58 Controlling Power Cycling
14.3.5
The control registers of the WM8350 are reset when it goes into the OFF state. Under default
conditions, the control registers are also reset when exiting the HIBERNATE state; this behaviour is
selectable using the REG_RESET_HIB_MODE control bit.
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 59 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 a register reset when leaving the
hibernate state.
1 = Do not 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, February 2011, Rev 4.4
WM8350
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