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Nokia Customer Care
TF4 Technical Information
Company Confidential
TFE-4/RV-1
Issue 2.0 Mar/2005
Copyright
©
2005
Nokia Corporation.
Page 8b-9
Company Confidential
List of Status-Change Reasons
1 VBAT < V
MSTR
and VBACK > V_BU
COFF
→
Go to BACK_UP
2 VBAT < V
MSTR
and VBACK < V_BU
COFF
→
Go to NO_SUPPLY
3 VBAT
Ê
V
MSTR+
. VBACK < V_BU
COFF
→
Go to DELAY1
4 VBAT > V
MSTR
. DELAY1 elapses
→
Go to RESET
5 VBAT
Ê
V
MSTR+
. VBACK > V_BU
COFF
→
Go to DELAY1
6 PWRONX = '0' or VCHAR
Ê
VCHAR
DET+
or ALARM = '1'
→
Go to DELAY1
7 VBAT > V
COFF+
→
Go to DELAY2
8 DELAY2 elapses
→
Go to DELAY3
9 VBAT > C
OFF+
. DELAY3 elapses
→
Go to DELAY4
10 DELAY4 elapses
→
Go to PWR_ON
11 SLEEPX = '0'
→
Go to SLEEP
12 SLEEPX = '1'
→
Go to PWR_ON
13 VBAT
Ì
V
COFF-
and VBAT > V
MSTR-
→
Go to PWR_OFF
14 No change
15 VBAT > V
MSTR
→
Stay in PWR_OFF
16 PWRONX
Ê
detection during DELAY2
→
Go to PWR_OFF
17 Watchdog elapses (approx. 100
µ
s)
→
Go to PWR_OFF
18 Thermal shutdown
→
Go to PWR_OFF
19 PwrKeyWatchdog (4 sec.) elapses
→
Go to PWR_OFF
Description of the UEM-States
The different states of the UEM are explained further below:
No supply
In the NO_SUPPLY mode the UEM has no supply voltage (VBAT < V
MSTR
and VBACK <
V_BU
COFF-
). This mode is due to the fact, that both supply voltages, the main battery and
the backup battery, are either disconnected or both discharged to a low voltage level.
The UEM will recover from NO_SUPPLY into RESET mode if the VBAT voltage level rises
above the V
MSTR+
level by either reconnecting the main battery or charge it to such level.