Led Indicators - Motorola DCS StarTac Service Manual

DCS 1800 StarTAC PERSONAL CELLULAR TELEPHONE
If the phone is charging or transmitting, the desktop charger
will take lower priority usage of the power supply. While the
phone is charging an attached battery, the phone controls the
Battery_Feedback line, which is routed from the phone to
the Transformer. This is so the Transformer can supply the
correct voltage (battery voltage + 1.4V), through the charger,
and into the phone. When the phone is not in the charging or
transmit mode it allows the charger base to take control of
the Battery_Feedback so the Transformer can supply the
correct voltage to any batteries in the charger's rear pocket.
The charger senses a battery installed in the rear pocket by
measuring the battery's terminal voltage and the battery's
thermistor resistance. The thermistor characteristics for all
batteries is shown in the Charger Specifications Table. If the
charger sees an open circuit on the thermistor line, the
pocket's LED will remain off indicating no battery detected.
Upon insertion of a battery, the charger will attempt to read
the battery EPROM to determine the type of battery and it's
charging characteristics. The battery is given up to three
requests for data. If the charger determines that no EPROM
is present, default charging values are used for high capacity
and low capacity type batteries (a low capacity battery has
its Data pin floating and a high capacity has its Data pin
grounded).
If after the third data request the charger still receives
corrupted data, the battery will be classified as faulty. The
battery will also be classified as faulty if its voltage falls
below 0.5V while under charge (the battery is assumed to be
shorted).

1. LED INDICATORS

The charger base has three bicolour LED's which can be off,
green, or red. The front LED indicates the charge status of
any primary battery attached to the phone; the middle LED
indicates the charge status of any auxiliary battery attached
Operating Temperature Range
Storage Temperature Range
Input Current (max)
INPUT VOLTAGE
Battery Voltage:
0 - 3.0V dc
3.0 - 5.1V dc
>5.1V dc
THERMISTOR CHARACTERISTICS
Temperature:
+5°×C
+25°×C
+40°×C
+45°×C
48
SPECIFICATIONS - DESKTOP RAPID CHARGER
68P09304A85
to the phone; and the back LED indicates the charge status
of any battery located in the rear pocket.
The charge status is indicated by the following LED states:-
Off: Battery pocket is inactive. Battery
unchargeable or
cannot be detected.
Flashing Yellow: Battery is waiting to rapid charge (i.e.
another battery is charging, the battery is
out of temperature range or below
voltage, or the transceiver is transmitting.
Flashing Red: Shorted battery, open battery contact,
corrupted EPROM data, or Lithium
battery in overvoltage mode.
Solid Red: Battery is being rapid charged.
Solid Green: Charge cycle is complete (battery is
>90% of rated capacity, trickle charge
may be activated.
Note 1/ The LED colour does not change when
the phone is in a call.
Note 2/ The charger waits 11 seconds before it
switches the rear LED to flashing yellow
after receiving a message from the phone
that it is transmitting. This is to prevent
the charger from flashing yellow when
the phone auto-registers.
Note 3/ The flashing rate for all LED's is 1 Hz.
2. MAINTENANCE
The Desktop Charger is considered non-serviceable. If it
becomes faulty, it should be replaced with a new one.
0°C to +50°×C
−40°C to +85°×C
1.1 Amps
Charger Input Voltage:
4.4V dc
(Vbatt + 1.4V) dc
6.5V dc
Resistance:
25.400 + 1270 Ohms
10,000 + 500 Ohms
5,330 + 266 Ohms
4,370 + 218 Ohms
battery thermistor
HAcc8
19/07/97