Xircom An Intel Company GEM3501 Manual De Usuario
Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001
22
Part Number: 07100026, Revision: 002
Confidential
© 2001 Xircom, Inc., an Intel company All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
5
5
P
P
O
O
W
W
E
E
R
R
5.1 Power Up Sequence
To power up the Core Engine, apply Vbat 3.7 Volts (+/- 0.3 Volts) to Core Engine I/O
interface pins 1-6 for VCC(+) and pins 7, 8, 11, 15, 19, 23, 24, 27, 33, 41, 44, 50, 59, 60
for GND(-).
interface pins 1-6 for VCC(+) and pins 7, 8, 11, 15, 19, 23, 24, 27, 33, 41, 44, 50, 59, 60
for GND(-).
The Core Engine will power up and will register on the network if an RF link is available.
5.2 Power Management
For maximum power savings some cooperation is required from the host device and
controlling software that interfaces to the Core Engine module. Mechanisms are provided
to allow the host to go to sleep and the Core Engine to wake the host, as well as for the
host to awaken the Core Engine.
controlling software that interfaces to the Core Engine module. Mechanisms are provided
to allow the host to go to sleep and the Core Engine to wake the host, as well as for the
host to awaken the Core Engine.
Several power management levels (or power modes) are implemented in the Core
Engine.
Engine.
5.2.1 Power Modes
5.2.1.1 “READY” Mode
The READY mode is characterized as follows:
!
AT+CFUN=1
!
The Core Engine is attached to the network.
!
PDP Context is activated.
!
Packet data transfer is in progress or imminent.
!
Full GSM operation for voice, data and SMS is possible.
!
The SLEEP signal on the Core Engine I/O interface is High.
5.2.1.2 “STANDBY” Mode
The STANDBY mode is characterized as follows:
!
AT+CFUN=1
!
The Core Engine is attached to the network.
!
Will transition to READY mode when an incoming message from the network is
detected.
detected.
!
Will transition to READY mode when an outgoing call is setup by the host.
!
The SLEEP signal on the Core Engine I/O interface is High.
!
Lower power than READY mode.
!
Reduced clock speed.