Nokia 6255 Description And Troubleshooting page 8

6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting
Reference signal
PwrOnX
Charger Detection
RTC
UEMRSTX
VCORE
VFlash1
VIO
VANA
VR3
19.2MHz Clk
PURX
Sleep Clock
Page 8
t1 t2 t3 t4
Figure 2: Power-on sequence and timing
©2005 Nokia Corporation
Nokia Customer Care
Reset mode is entered and
the watchdog starts
End of settling time (only if Vbat > Vcoff+_);
VFLASH1 regulator enabled
VR3, VANA, VIO, and VCORE enabled;
PURX held LOW
D2800 processor, MCU, and DSP are
reset; VCTCXO regulator forced on
t1 = 20ms t3 = 500us
t2 = 200ms t4 = 20ms
Company Confidential Issue 2 05/2005