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6.4.2 Power Supply
MiniMoe - (IC19)
MiniMoe is a dedicated power supply, which provides most of the
power requirements for the logic circuit. The RF section has its own dedicated
power supply device MicroMoe which is separate to MiniMoe, except for a
dedicated 5 volt supply (5VRF) for the VCO's. MiniMoe consists of six voltage
regulators that supply the power rails for the logic circuit.
MiniMoe provides the following functions:-
• Generation of a reset pulse to ILB - when battery voltage is at cut-off threshold
(2.85V- 3.1V ) or UVLO2- (Under Volts Lock Off 2).
• A function that disables the regulators 2, 3, 5, 6 and 7 when the battery
voltage is less than UVLO2.
• Back-up battery management: (BUB - #12)
• ILB power supply: (+3VILB - #31)
• Logic supply rail: (+3VNELL - #3)
• SIM supply, configurable between 3 and 5 volt operation: (SIMVCC - #6)
• Dedicated 5 volt supply for the transceiver VCO: (5VRF - #10)
• A low noise regulator for the handset audio and CSP analogue sections:
(+3VSC -#4) and (+3VAUDIO - #2)
With the exception of regulator 1, each of these regulators can be controlled by
individual enable signals. These are configured as shown in Figure 6c and table1.
Regulator outputs.
Regulator
Pin
Regulator 1
31
+3VOILB
Regulator 2
3
+3VNELL
Regulator 3
4
+3VSC
Regulator 5
6
SIMVCC
Regulator 6
10
+5VRF
Regulator 7
2
+3VAUDIO
Voltage
2.85 ±0.15V
2.85 ±0.15V
2.85 ±0.15V
3.0 ±0.15V
4.75 ±0.25V
5.0V± 0.25V
2.85 ±0.15V
Table1. - MiniMoe
Powers
ILB part of NELL
CPU, RAM, LCD
NELL, Flash ROM,
EEPROM
& 13MHz Oscillator
SC1 digital circuitry
SIM
VCO
CSP Audio circuitry
Enable Signal/PIN
Supplied from
battery
HARD_PWR(28)
+RG3VPWR(21)
SIMPWR(20)
SIMVSEL(18)
5VRFON(19)
+RG3VPWR (21)
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