User Guide

PAMS
Technical Documentation
RAE–2
Baseband
Page 2– 30
Original 02/99
Vbat
VBB (2.8V)
VXO
PURX
Vchar
12 3
1: Battery voltage over 3.0==>Digital voltages to CCONT (VBB)
2: CCONT digital reset released. VCXO turned on
3: 62ms delay before PURX released
VR1
SLEEPX
Figure 18. Power up with charger
VR6
Vref
Service Request State (SRS)
If CMT is powered off, the PDA has a possibility to startup the CMT to
SERVICE REQUEST (SRS) state by using PWRONx line. The PDA can
do it by pulling the PWRONx line to the low (”0”) state. The difference be-
tween the SRS and acting dead is that the SRS is invisible to the user.
Also during the SRS the RF parts are always powered off.
The SRS is needed when the PDA is going to communicate with the CMT
(e.g. asking some SIM information or battery voltage information) when
the CMT is powered off.