User Guide

RH-20 Company confidential
System Module and User Interface CCS Technical Documentation
Page 26 Nokia Corporation. Issue 1 10/2003
Pin numbering of battery pack
Figure 5: BLD-3 battery pack pin order
Power Up and Reset
Power up and reset is controlled by the UEM ASIC. RH-20 baseband can be powered up
in following ways:
• Press power button which means grounding the PWRONX pin on UEM
• Connect the charger to the charger input
• Supply battery voltage to the battery pin.
• 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
its reset mode. The watchdog starts up, and if the battery voltage is greater than Vcoff+
a 200ms delay is started to allow references etc. to settle. After this delay elapses the
VFLASH1 regulator is enabled.
500us later VR3, VANA, VIO and VCORE are enabled. Finally the PURX line is held low for
20 ms. This reset, PURX, is fed to the baseband ASIC UPP, resets are generated for the
DSP and the MCU. During this reset phase the UEM forces the VCXO regulator on regard-
less of the status of the sleep control input signal to the UEM.
The sleep signal from the ASIC is used to reset the flash during power up and to put the
flash in power down during sleep. All baseband regulators are switched on at the UEM
power on except for the SIM regulator that is controlled by the MCU. The UEM internal
watchdog is running during the UEM reset state, with the longest watchdog time
selected. If the watchdog expires, the UEM returns to power off state. The UEM watch-
dog is internally acknowledged at the rising edge of the PURX signal in order to always
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
1 (+) 2(BSI) 3(BTEMP) 4(GND)