WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 151

• Manufacturer Part Number: WM8310GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 169BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8310GEB/V

• Supply Voltage: 7V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 11
• Digital Ic Case Style: BGA
• No. Of Pins: 169
• No. Of Regulated Outputs: 13
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pre-Production
24 RESETS AND SUPPLY VOLTAGE MONITORING
24.1 RESETS
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The WM8310 provides hardware and software monitoring functions as inputs to a Reset
management system. These functions enable the device to take appropriate action when power
supplies are critically low or if a hardware or software fault condition is detected.
There are different levels of Resets, providing different response mechanisms according to the
condition that caused the Reset event. Where applicable, the WM8310 will automatically return to the
ON state and resume normal operation as quickly as possible following a Reset.
A System Reset occurs in the event of a Power Sequence Failure, Device overtemperature,
SYSVDD undervoltage, Software ‘OFF’ request or VPMIC (LDO12) undervoltage condition. Under
these conditions, the WM8310 asserts the RESET
of the Register map are not reset under these conditions. If the System Reset was caused by a
Converter Undervoltage condition, then the WM8310 will automatically return to the ON state after
performing the System Reset.
A Device Reset occurs in the event of a Watchdog Timeout, Hardware Reset request or Converter
(LDO or DC-DC) Undervoltage condition. Under these conditions, the WM8310 asserts the RESET
pin and transitions to the OFF state. In the case of VPMIC undervoltage, the WM8310 enters the
BACKUP state. The contents of the Register map are cleared to default values, except for the RTC
and software scratch registers, which are maintained. If the Device Reset was caused by a
Watchdog timeout or Hardware Reset request, then the WM8310 will automatically return to the ON
state after performing the Device Reset.
A Software Reset occurs when any value is written to Register 0000h, as described in Section 12.5.
In this event, the WM8310 asserts the RESET
map contents may or may not be affected, depending on the value of the SW_RESET_CFG field.
See Section 24.3 for further details of Software Reset configuration. The WM8310 will automatically
return to the ON state after performing the Software Reset.
A Power-On Reset occurs when the supply voltage is less than the Power-On Reset threshold, as
described in Section 24.4. In this event, the WM8310 is forced into the NO POWER state, as
described in Section 11.2. All the contents of the Register map are lost in the NO POWER state.
¯ ¯ ¯ ¯ ¯ ¯ pin and transitions to the OFF state. The Register
¯ ¯ ¯ ¯ ¯ ¯ pin and transitions to the OFF state. The contents
PP, December 2009, Rev 3.0
WM8310
¯ ¯ ¯ ¯ ¯ ¯
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