Motorola DCS StarTac - Page 78

1. L_BATT = MAIN BATTERY
2. added AUX_BATT = AUXILORY BATTERY
NOR
1
2
4
H
H
H
H
H
L
L
L
L
L
L
L
HH
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
L
L
L
L
L
L
L
L
ON
OFF
OFF
ON
L
L
L
L
L
L
L
H
H
H
H
OFF
OFF
ON
OFF
OFF
3. 1+2 added EXT B+ = AUXILIARY ACCESSORY
GSM StarTAC - BATTERY SELECT CIRCUIT
AUX_MAIN :
When the line is high, the main battery is discharging
When the line is low, the auxiliary battery is discharging
AUX_SENSE
AUX_MAIN
L275
L_PWR
L275
L_BATT
MICIN-
MICOUT
AUD_EN2
AUD_EN1
WDOD
*RESET
ON_OFF_SENSE
*PWR_SENSE
R275
L275
L275
WDOG
ON_OFF_SENSE
*PWR_SENSE
*RESET
EXT_B+
AUX_BATT
B+
LPWR
L_BATT+
LPWR
B+
L_BATT+
EXT_B+
EXT_B+
AUX_BATT+
EXT_B+
L_BATT+
AUX_BATT+
AUDIO_OUT
PWR_SW
VSWITCH
Europe Middle East & Africa Customer Services 10.08.98
LEVEL 3 COLOUR DIAGRAMS Rev. 1.2
GSM / DCS StarTac Battery Select Circuit
Colin Jack, Michael Hansen, Billy Jenkins , Ralf Lorenzen Page 1 of 1
REVISIONS
The AUX battery always has the first priority
in discharging
The MAIN battery always has the first priority
in charging