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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 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 32 kHz oscillator and RTC module (VRRTC).
Supplies power for the 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
1.5 V ±0.15 V
Current
30
µ
A.
Dropout
100 mV max (load max)
Supply
UPR