TECHNICAL DESCRIPTION
Issue 1 Section 4 PMCD030901C8
Revision 0 – 22 – Service Manual
• D18VMEM / D18V: Power supply used by Flash and PSRAM memory and memory I/O, vibrate.
The D18V power supply is provided by a permanently enabled discrete 1.8V regulator IC. This rail is used to supply the
vibrate motor and is FET switched to provide the D18MEM rail for the CALYPSO+ memory interface and external flash
memory IC.
• D28V: (SYREN VRMEM) Power supply for the Bluetooth module.
Supplies the Bluetooth module U500.
• VRRAM: not used.
• VRABB: Digital Power supply for SYREN analogue section.
This supply provides power for the internal SYREN analogue section.
• VRSIM: Digital Power supply for SIM card.
Supplies power for the SIM card.
• VRRTC: Digital power supply for CALYPSO+ 32 kHz oscillator and RTC module (VRRTC).
Supplies power for the CALYPSO+ 32 kHz oscillator and RTC module. Selectable from 1.3 V, 1.5 V and 1.8 V. It is
supplied from UPR to enable it to be maintained from the backup cell when the main battery is removed.
Voltage 1.8 V ±0.1 V
Current 450 mA max.
Dropout 100 mV max (load max)
Supply VBAT
Voltage 2.8 V ±0.1 V
Current 60 mA max.
Dropout 100 mV max (load max)
Supply VBAT
Voltage 2.8 V ±0.1 V
Current 50 mA max.
Dropout 100 mV max (load max)
Supply VBAT
Voltage 2.8 V ±0.1 V
Current 80 mA max.
Dropout 100 mV max (load max)
Supply VBAT
Voltage 2.15 V ±0.15 V
Current 10 mA max.
Dropout 100 mV max (load max)
Supply VBAT
Voltage 1.5V ±0.15V
Current 30
µA.
Dropout 100 mV max (load max)
Supply UPR
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