User Guide

NHB–3
Technical Documentation
PAMS
HF Desktop Charger CHH–8P
Original 26/97 Page 3
Handsfree Desktop Charger CHH–8P
Contents
HF Desktop Charger CHH–8P Page 4
General Page 4
User Interface Features Page 5
Charging Indication Page 5
Charge States and Charge Control Page 5
Instructions for Use Page 6
Charging the Phone Battery Page 6
Charging the Extra Battery Page 6
Deep Discharging of the Extra Battery Page 7
Handsfree Function Page 7
Using the Voice Mail Page 7
The Data Connection Page 7
Technical Specifications Page 8
Modes of Operation Page 8
External/Internal Signals and Connections Page 8
Functional Description Page 13
Supply Voltages Page 13
Control Logic Page 13
Port A Signals of the Processor Page 14
Port B Signals of the Processor Page 14
Port C Signals of the Processor Page 14
Port D Signals of the Processor Page 15
Port F Signals of the Processor Page 15
Processor A/D Inputs Page 15
Watchdog Circuits Page 16
Battery Charging Page 16
Spare Battery Discharging Page 16
Microphone Amplifier and Corresponding Switches Page 17
Speaker Amplifier and Corresponding Swithes Page 17
Block Diagram of CHH–8 Page 18
Circuit Diagram of DC3 Power Supply and Control Module Page 19
Circuit Diagram of DC3 Audio Switches and Amplifiers Page 20
Circuit Diagram of Connector Module DC4 Page 21
Layout and Foil Diagrams of DC4 Page 23
Parts List of DC3 Code: 0200211 Page 24
Parts List of DC4 Code: 0200235 Page 31
Exploded View Page 32
Assembly Parts Page 33