Motorola SSETM 5000 service manual Power Distribution, Part Number Description, V5A, V3A V3D

2-4 Theory of Operation: Power Distribution

2.3Power 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.

Battery RF Board VOCON Board

J1 BATT				FB+	P1	UNSW_B+
		Fuse
RAW B+						P201
			FET
							FET
	XB+

VCC 5 5 Volts

SW_B+

				(control signal)
		V5A
		5 Volts
7.5 Volts
(Nominal)
		V3A		V3D
		3 Volts		3 Volts
	Analog Circuits		Digital Circuits

3.8 V (VSW1)

1.875 Volts

1.55V (VSW2)

1.55Volts (VSW_1.55)

GCAP II

2.893 2.893 Volts Volts (VREF) (V2)

MAEPF-27419-A

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:

	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)

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,

November 11, 2004 6881094C12-A