Nokia NKC-1X Series Troubleshooting Instructions page 7

CCS Technical Documentation
1 Power key pressed
•After 20ms UEM enters RESET MODE if VBAT>Vmstr+
•VFLASH1, Vana, Vcore, Vio and VR3 goes high.
•VCTCXO enabled by VR3 -> RFClk 19.44 MHz running.
2 Purx released
•Purx released by UEM, UEMINT goes high for 100 ms, SleepX goes high and UEM
starts feeding SleepClk (32 KHz) to UPP.
Note: The sleepclock starts running in the crystal circuitry (B200) immediately when
the battery voltage is supplied.
3 Software running
•Default value for Vcore is 1.5 volts when the software is running.
•Cbus (1.08MHz) clock starts running.
Issue 1 02/03
Figure 1: Power up sequence
Figure 2: Power up sequence
Nokia Corporation
Troubleshooting Instructions
NKC-1X
Page 7