2-6

Theory of Operation: Power Distribution

 

 

Table 2-4lists the supply voltages and the circuits that use these voltages.

Table 2-4. VOCON Board DC Power Distribution

Supply

Output

Supply Type

Unprogrammed

Circuits Supplied

Name

Voltage

Output Voltage

 

 

 

 

 

 

 

 

 

 

 

 

UNSW_B+

9 to 6 Vdc

Battery

N/A

VCC5 input

 

7.5 Vdc

 

 

Mechanical switch

 

nominal

 

 

Power switch (FET)

 

 

 

 

Secure module

 

 

 

 

 

SW_B+

9 to 6 Vdc

Battery

N/A

VSW1 input (GCAP)

 

7.5 Vdc

 

 

Audio power amplifier

 

nominal

 

 

Side connector

 

 

 

 

SW_B+ to transceiver board

 

 

 

 

GCAP IC

 

 

 

 

Secure module

 

 

 

 

USB circuitry

 

 

 

 

 

VCC5

5Vdc

Linear regula-

N/A

Smart battery circuitry

 

 

tor

 

Int. / ext. microphone bias

 

 

 

 

Audio preamplifier

 

 

 

 

Digital-support IC

 

 

 

 

Display LEDs

 

 

 

 

 

VSW1

3.8 Vdc

Switching

3.2 Vdc

3-V regulators (RF)

 

 

regulator

 

VSW2 input

 

 

software pro-

 

V2 input

 

 

grammable

 

1.55 V regulator bias

 

 

 

 

 

VSW2

1.8 Vdc

Switching

2.2 Vdc

Dual-core processor’s external

 

 

regulator

 

memory interface

 

 

software pro-

 

FLASH IC

 

 

grammable

 

SRAM

 

 

 

 

1.55 V regulator bias

 

 

 

 

 

VSW_1.55

1.55 Vdc

Linear regula-

N/A

Dual-core processor core

 

 

tor

 

 

 

 

 

 

 

V2

2.893 Vdc

Switching

2.775 Vdc

Dual-core processor’s I/O ring

 

 

regulator

 

Digital-support IC

 

 

software pro-

 

EEPOT

 

 

grammable

 

Display

 

 

 

 

16.8 MHz buffer

 

 

 

 

 

November 11, 2004

6881094C12-A

Page 28
Image 28
Motorola SSETM 5000 service manual Supply Output Supply Type Unprogrammed Circuits Supplied, Voltage Output Voltage