User Guide
Table Of Contents
- Introduction
- Technical Summary
- List of Modules
- Operation
- Supply Voltage and Power Consumption
- Charging voltage limits within current specifications fulfilled
- Audio Specifications, electrical
- HFS-12 Audio Specifications, acoustic
- HFM-8 Audio Specifications, acoustic
- Audio signal levels
- Signals and Connections
- Block Diagram
- Parts list of ED2
- BACK TO MAIN TOC
PAMS
Technical Documentation
HFU–2 Handsfree Unit
Page 7
Original 11/97
Block Diagram
DC connector
X300
CHARGE
SMPS
POWER
SUPPLY
EXTERNAL
I / O
CONTROL
CIRCUITS
AUDIO
INTERFACE
POWER
AMPLIFIER
System
connector X100
External Speaker
Connector X500
External Microphone
Connector X200
MICROPHONE
AMPLIFIER
EAR
MBUS
RESET
PWRON
VCC
CRM
IGNS
CHGON
V_IN
VCC
CRM
IGNS
AMC
AMC
EAR
CHRG_CTRL
protec–
tion
protec–
tion
HS / Data con–
nector X200
protec–
tion
FBUS
AUDIO
AUDIO
protec–
tion
protec–
tion
MUTE
LOGIC
MUTE
MUTE
PASSIVE
MIC