June 15, 2005
6815854H01-A
3-66
Theory of Operation:
Controller Section
The various voltages used by the ICs on the main board are shown in
3.14.3 Reset Circuits
The reset circuits consist of the power-on reset (POR*) circuit (
), SW_B+ sense circuit,
and SB9600 bus reset circuit. These circuits allow the microprocessor to recover from an unstable
condition, such as removing battery A+ from the radio while it is on, battery voltage too low, and
miscommunication to remote devices on the SB9600 bus, as well as generally monitoring the power
on/off condition.
Table 3-11. Integrated Circuits Voltages
Integrated Circuit UNSW5V
SW 5V
A+
3.0 V
2.85 V
9.3 V_T
X
1.85 V
1.55 V
Patriot
Microprocessor
U100
U100
U100
Flash
U102
SRAM
U103
A/D
U0953-28
D/A
U0959-4
Modulation D/A
U0900-3
FL0900-4
Urchin
U0901
RS-232 XCVR
U0305-16
USB XCVR
U0304-7
Audio PA
U0204-7
CODEC
U200-6
Amplifiers, EPOTs
U0201-4
U0202-3
555 Timer
U0506-4
SB9600 MUX
U606-16
Volume Pot
U0206-7
32K Crystal
Y0100-5
Modulation MUX
U0902-16
Power Control
U0956-4
U0957-4
U0960-4
Keyed 9.1 V Switch
Q0952
Содержание XTL 1500
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