Motorola SSETM 5000 - Manual (Page 26)

November 11, 2004 6881094C12-A
2-4 Theory of Operation: Power Distribution
2.3 Power Distribution
This section provides a detailed circuit description of the power distribution of the SSE 5000 radio.
In the SSE 5000 radio, power (B+) is distributed to two boards: the transceiver (RF) board and the
VOCON board (
see Figure 2-4 ). In the case of a secure radio, B+ is also supplied to the encryption
module.
Figure 2-4. DC Power Distribution—UHF Radios
Power for the radio is provided through a battery supplying a nominal 7.5 Vdc directly to the
transceiver. The following battery types and capacities are available:
B+ from the battery is electrically switched to most of the radio, rather than routed through the On/
Off/Volume knob. The electrical switching of B+ supports a keep-alive mode. Under software control,
Table 2-1. Conventional Batteries
Part Number Description
NTN4595 Premium NiCd (1800 mAh, 7.5 V)
NTN4596 Premium NiCd FM (1800 mAh, 7.5 V)
NTN4992 Premium NiCd FM (1800 mAh, 7.5 V) (HazMat)
Table 2-2. Smart Batteries
Part Number Description
HNN9033 impres™ NiCd (2000 mAh)
HNN9034 impres™ NiCd FM (2000 mAh)
GCAP II
VCC 5
V5A
RF Board VOCON Board
Battery
V3A V3D
RAW B+
5 Volts
SW_B+
UNSW_B+
3 Volts
Analog Circuits
3 Volts
Digital Circuits
2.893
(V2)
5 Volts
3.8 V (VSW1)
(control signal)
2.893
(VREF)
7.5 Volts
(Nominal)
1.875 Volts
(VSW2)
BATT FB+
XB+
1.55V
1.55 Volts
(VSW_1.55)
Fuse
FET
FET
P201
P1
MAEPF-27419-A
J1
Volts Volts