Specifications

XT65/XT75 Hardware Interface Description
3.5 Charging Control
s
XT65_XT75_HD_v01.001 Page 46 of 133 2007-1-8
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Table 10: Comparison Charge-only and Charge mode
How to activate mode Description of mode
Charge
mode
Connect charger to charger input of host
application charging circuit and module’s
VCHARGE pin while XT65/XT75 is
• operating, e.g. in IDLE or TALK mode
• in SLEEP mode
• Battery can be charged while GSM module
remains operational and registered to the GSM
network.
• In IDLE and TALK mode, the serial interface is
accessible. All AT commands can be used to
full extent.
NOTE: If the module operates at maximum power
level (PCL5) and GPRS Class 12 at the same time
the current consumption is higher than the current
supplied by the charger.
Charge-
only mode
Connect charger to charger input of host
application charging circuit and module’s
VCHARGE pin while XT65/XT75 is
• in Power-down mode
• in Normal mode: Connect charger to
the VCHARGE pin, then enter
AT^SMSO.
NOTE: While trickle charging is in
progress, be sure that the host application
is switched off. If the application is fed
from the trickle charge current the module
might be prevented from proceeding to
software controlled charging since the
current would not be sufficient.
• Battery can be charged while GSM engine is
deregistered from GSM network.
• Charging runs smoothly due to constant cur-
rent consumption.
• The AT interface is accessible and allows to
use the commands listed below.