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Nokia 616 Service Manual: Description Of The Hardware Realization

Carkit phone (tfe-4/rv-1).
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Nokia Customer Care
Signalname
B2BUIPOWERON UI-Power control signal
VWAKE
Powersupply for VMIC,
Powerup control and
Engine-RTC
VEBPWR
Powersupply for Engine
and Headset Powerampli-
fier
VAudio
Powersupply for Hands-
free Poweramplifier
VMIC
Phantom-Power for HF-
Microphone
VIDDU
Protected Power for Input
Device and Display Unit

Description of the Hardware Realization

The power supply block consists of three power regulators and three power switches.
Vwake/Vmic
Vwake is the power, which supplies all circuitsthat have to be active when car battery is
applied. This power path has to be optimized for low leakage current to guarantee the
1mA standby demand. The Voltage VWAKE is used in the Power control block and as
Backup-Battery replacement for the EB. When HF-Audiopath is activated, (B2BHFMute is
high) the VWAKE power is directed to VMIC
Issue 2.0 Mar/2005
Company Confidential
Description
Inputs
High: 1.6..18V
Low: 0..0.5V
Outputs
5V 5%
Sleepmode:
0V
active:
4.2V 5%
0V when
switched off,
else 5V 5%
0V when
switched off,
else 4V
Copyright © 2005 Nokia Corporation.
Company Confidential
TF5 Technical Information
Range
When Error then .......
Here: UIPOWER will always be
switched on with VEBPOWER
(when always high)
Or always off (when always low)
Unit will not wakeup
Unit will not wakeup (when
always low)
Or Sleepmode current will be too
high (when always high)
HF Poweramplifier will not work
VMIC invisible on HFMIC con-
nector
UIPower or s.c. Protection will
not work
TFE-4/RV-1
Page 8a-13

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