Nokia RH-6 Series Baseband Description & Troubleshooting page 11

CCS Technical Documentation
The text below explains the state diagram. The symbol ' ' means that the voltage rises
and ' ' that the voltage drops. '→' Means the result of the conditions set on the left
most side.
VBAT < V
MSTR
VBAT < V
MSTR
VBAT V
MSTR+
VBAT > V
MSTR
VBAT V
MSTR+
PWRONX = '0'
VBAT > V
COFF+
DELAY2 elapses
VBAT > C .
OFF+
DELAY4 elapses
SLEEPX = '0'
SLEEPX = '1'
VBAT V
COFF
No change
VBAT > V
MSTR
PWRONX detection during DELAY2
Watchdog elapses (approx. 100 (s)
Thermal shutdown
PwrKeyWatchdog (4 sec.) elapses
The different states of the UEM are detailed in the sections below.
No supply
In the NO_SUPPLY mode the UEM has no supply voltage (VBAT < V
V_BU ). This mode is due to the fact that both the main battery and the backup bat-
COFF-
tery 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+
Backup
In BACK_UP mode the main battery is either disconnected or has a low voltage level
(VBAT < V
MSTR-
The regulator VRTC that supplies the real time clock is disabled in BACK_UP mode.
Instead the unregulated backup battery voltage VBACK supplies the output of the VRTC.
All other regulators are disabled and the phone has no functionality.
The UEM will recover from BACK_UP mode into RESET mode if VBAT rises above V
Issue 1 10/2003
Company Confidential
and VBACK > V_BU
and VBACK < V_BU
and VBACK < V_BU
and DELAY1 elapses
and VBACK > V_BU
or VCHAR
or ALARM = '1'
and DELAY3 elapses
and VBAT > V
level by either reconnecting the main battery or charge it to such level.
and VBACK > V_BU
COFF+
© 2003 Nokia Corporation.
6 - BB Description & Troubleshooting
→ BACK_UP
COFF
→ NO_SUPPLY
COFF
→ DELAY1
COFF
→ RESET
→ DELAY1
COFF
VCHAR
DET+
→ DELAY1
→ DELAY2
→ DELAY3
→ DELAY4
→ PWR_ON
→ SLEEP
→ PWR_ON
→ PWR_OFF
MSTR-
→ Stay in PWR_OFF
→ PWR_OFF
→ PWR_OFF
→ PWR_OFF
→ PWR_OFF
).
RH-6
and VBACK <
MSTR
.
MSTR+
Page 11