Circuit Description; Control Logic; Prosessor Input/Output Signals; Processor A/D Inputs - Nokia 2160 Technical Documentation Manual

Desktop Charger CHH–2

Circuit Description

The DC2 desktop charger module consists of microcomputer based con-
trol logic for spare battery charging and discharging. It also has power
outlet for transportable phone.

Control Logic

Charging is controlled by processor D150. It is a single–chip type control-
ler incorporating RAM, ROM, A/D converter, and a multifunction timer/
counter.

Prosessor Input/Output Signals

Name:
PA0
PA1
PA2
PA3
PA4/DBIN
PA5/DISW
PA6/BSW
PC7

Processor A/D Inputs

Name:
AN0/VBATL
AN1/VBATH
AN2/PDET
AN3/BTEMP
AN4/BSI
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Function:
Phone LED control, green: "1"
Phone LED control, red: "1"
Spare battery LED control, green: "1"
Spare battery LED control, red: "1"
Discharge button input, "0": start discharge
Discharge control output, "1": discharge enabled
Spare battery charge control, "0": charge disabled,
"1": rapid charge, PWM: pulsed mode
Watchdog reset output
Function:
Battery voltage
range: 0...11 V
resolution: 43 mV/bit
High resolution battery voltage
range 7...11 V
resolution: 16 mV/bit
Phone current detect
PDET = "1" for A/D value higher than 5
PDET = "0" for A/D value 5 of or less
Battery temperature, 27 kΩ pull–up resistor to
+5 V reference voltage
Battery size, 100 kΩ pull–up resistor to +5 V
reference voltage
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