Power Control/Reset Blockdiagram - Nokia 616 Service Manual

TFE-4/RV-1
TF5 Technical Information

Power control/Reset Blockdiagram

Vcarchec
Vcar
k
IGNS
Sense
Levelshi
fter
B2BIGNS
BSI
BSI-
switch
The Vcar-Check Block is responsible to monitor if the Vcar is within operating range.
When the voltage range of the car battery is too high or to low Powerok line will be low
and the board will not start up anymore. By holding B2BPOWEROFF high, the Phone-
Engine can force the Power supply to switch off when ignition sense input is low. The
Poweronx block generates pulses of 0.5Hz, when Vebpwr is active.
Description of Inputs, Outputs and Block-Internal Lines
Signalname
VCAR Protected Carbattery Voltage Defined: 5V..20V
SENSE Ignition Sense signal from
Carconnector
VWAKE Powersupply for VMIC,
Powerup control and
Engine-RTC
B2BPOWEROFFX Control signal from Engine-
board to switch off SMPSon
after Ignition is switched off
Page 8a-18
Company Confidential
Vwake
VEBPWR
POWEROK
IGNS5V
PoweronX
POWEROK
Figure 12: Block diagram of Power control/Reset Block
Description
Copyright © 2005 Nokia Corporation.
Company Confidential
SMPSON
SMPSStartup
B2BPOWERONX
Range
Inputs
Operating: 9..15V
Low: 0..8V
high (active
mode):
8..28V
5V 5%
High: 1.6..18V
Low: 0..0.5V
Nokia Customer Care
B2BPOWEROFFX
When Error then .......
Whole unit will not work
Unit will not wakeup (when
always low)
or sleepmode current will be
too high (when always high)
Unit will not wakeup
SMPSon will always keep
active (when always low) or
goes immediately low when
ignition is switched off
(when always high)
Issue 2.0 Mar/2005