wm8325gefl/v Wolfson Microelectronics plc, wm8325gefl/v Datasheet - Page 15

• Manufacturer Part Number: wm8325gefl/v
• Description: Processor Power Management Subsystem
• Manufacturer: Wolfson Microelectronics plc

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BACKUP DOMAIN FOR RTC AND SYSTEM CONFIGURATION RETENTION
AUXILIARY ADC
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The WM8325 incorporates a 12-bit Auxiliary ADC (AUXADC). This can be used to perform a number
of system measurements (backup battery voltage or chip temperature) and can also be used to
measure analogue voltages from external sources and sensors.
External inputs to the AUXADC should be connected to the pins GPIO10, GPIO11, GPIO12. The
maximum voltage that can be measured is determined by the power domain associated with each
(DBVDD or PVDD).
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Clocked Backup state quiescent current of 2μA with Real Time Clock (RTC) running
Unclocked Backup state quiescent current of 100nA with RTC paused
Up to 5 minutes of data retention with a 22μF on VPMIC (LDO12VOUT) in unclocked
backup state
Automatic transition to backup power source
32kHz Crystal oscillator
RTC with alarm function
Secure-RTC tamper detection mechanism for unauthorised updates to the RTC
Dedicated backup battery charger
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12-bit Auxiliary ADC (AUXADC) for system supervision and resistive touch panel
Monitors up to 3 external sources, plus key internal parameters and voltages
4 digital comparators with selectable input source
Programmable output voltage 2.5V or 3.1V
Constant Current (CC) or Constant Current / Constant Voltage (CC/CV) modes
Programmable current 100μA to 400μA
Charging status flag
Automatic isolation of charger when PVDD headroom is low
Product Brief, February 2011, Rev 1.4
WM8325
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