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.
Table1. - MiniMoe
Regulator
Pin
Voltage
Powers
Enable Signal/PIN
Regulator 1
+3VOILB
31 2.85
±
0.15V ILB part of NELL
CPU, RAM, LCD
Supplied from
battery
Regulator 2
+3VNELL
3 2.85
±
0.15V NELL, Flash ROM,
EEPROM
& 13MHz Oscillator
HARD_PWR(28)
Regulator 3
+3VSC
4 2.85
±
0.15V SC1 digital cirRG3VPWR(21)
Regulator 5
SIMVCC
6 3.0
±
0.15V
4.75
±
0.25V
SIM SIMPWR(20)
SIMVSEL(18)
Regulator 6
+5VRF
10 5.0V
±
0.25V VCO 5VRFON(19)
Regulator 7
+3VAUDIO
2 2.85
±
0.15V CSP Audio cirRG3VPWR (21)
Summary of Contents for DB2000
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Page 83: ...Fit Antenna INSERT AND SCREW THE ANTENNA INTO THE ASSEMBLY ...
Page 107: ...Fig 3 7 GSM_LNA Pg 3 3I TP419 Fig 3 8 PCN_LNA Pg 3 3J TP420 Fig 4 9 TCXO Pg 2 H11 TP413 ...
Page 109: ...Fig 4 3 PCN_TX Pg 1 1J TP417 Fig 4 4 3V_G_TX Pg 1 4I TP100 Fig 4 5 3V_P_TX Pg 1 4J TP101 ...
Page 110: ...Fig 4 6 GSM_ON Pg 1 2K TP402 Fig 4 7 PCN_ON Pg 1 1K TP415 Fig 4 8 PRE_ON Pg 1 4J TP416 ...
Page 112: ... I Q ...
Page 113: ...Fig 4 14 V_ERROR PCN Pwr Lvl 7Pg 1 16I Fig 4 15 300khz Charge Pump Pg 1 Log 9G ...
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