Table 2-3. Vocon Section Dc Power Distribution - Motorola ASTRO XTSTM 4000 Detailed Service Manual

Radio Power: DC Power Routing—VOCON Section
The digital circuits in the VOCON section are powered from regulators located in the MAKO IC
(U1304). The MAKO IC provides five supplies: VSW1, V2, V1.55, V1.875 and VCC5. These
regulators are software programmable except for VCC5.
circuits that use these voltages.
Supply
Name
UNSW_B+
SW_B+
VCC5
VSW1
V1.875
V2
V1.55
6871620L01-C

Table 2-3. VOCON Section DC Power Distribution

Output
Supply Type
Voltage
9 to 6 Vdc Battery
7.5 Vdc
nominal
9 to 6 Vdc Battery
7.5 Vdc
nominal
5Vdc Linear
Regulator
3.8 Vdc Switching
regulator
software
progammable
1.875 Vdc Switching
regulator
software
progammable
2.9 Vdc Linear
regulator
software
programmable
1.55 Vdc Linear
regulator
Table 2-3 lists the supply voltages and the
Unprogrammed
Circuits Supplied
Output Voltage
N/A MAKO IC
5V Misc. Regulator
N/A MAKO
XCVR 5V Regulator
CE Interface
Encryption Module
N/A MAKO Int. / ext. microphone
bias
MAKO Audio preamplifier
3.2 Vdc 3-V regulators (XCVR)
VSW2 input
V2 input
1.9 Vdc Patriot core
FLASH IC
SRAM
Display module
2.775 Vdc Patriot I/O ring
Display module
16.8 MHz buffer
N/A Patriot core
2-3
May 28, 2008