NHM–7
System Module & UI
PAMS Technical Documentation
Page 22
Issue 1 10/2001
Nokia Corporation
Battery
Li–ion battery pack BLB–2 is used in NHM–7.
Nominal discharge cut–off voltage
3.1V
Nominal battery voltage
3.6V
Nominal charging voltage
4.2V
Pin numbering of battery pack
Signal name
Pin number
Function
VBAT
1
Positive battery terminal
BSI
2
Battery capacity measurement (fixed resistor inside the
battery pack)
BTEMP
3
Battery temperature measurement (measured by ntc
resistor inside pack)
GND
4
Negative/common battery terminal
BLB–2 battery pack pin order
1 (+)
2(BSI)
3(BTEMP)
4(GND)
Power Up and Reset
Power up and reset is controlled by the UEM ASIC. NHM–7 baseband
can be powered up in following ways:
1. Press power button which means grounding the PWRONX pin of the
UEM
2. Connect the charger to the charger input
3. Supply battery voltage to the battery pin
4. RTC Alarm, the RTC has been programmed to give an alarm
After receiving one of the above signals, the UEM counts a 20ms delay
and then enters it’s reset mode. The watchdog starts up, and if the battery
voltage is greater than Vcoff+ a 200ms delay is started to allow refer-
ences etc. to settle. After this delay elapses the VFLASH1 regulator is en-
abled. 500us later VR3, VANA, VIO and VCORE are enabled. Finally the
PURX (Power Up Reset) line is held low for 20 ms. This reset, PURX, is
fed to the baseband ASIC UPP, resets are generated for the MCU and
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