Specifications

AT Command Set
TC3X_ATC_01_V04.00 Page 148 of 204 29.05.2002
6.5 AT^SBC Battery charging / discharging and charge control
This chapter is only applicable to TC35 and TC37, it is not intended for the TC35 Terminal.
Responses returned by the AT^SBC command vary with the operating mode of the ME:
Normal mode: ME is switched on by Ignition pin and running the SLEEP, IDLE,
TALK or DATA mode. Charger is not connected. AT^SBC can be
used to query the battery capacity and the power consumption of
ME and application (if value of application was specified before as
<current>).
Normal mode + charging: Allows charging while ME is switched on by Ignition pin and running
the SLEEP, IDLE, TALK or DATA mode. AT^SBC returns charger
status and power consumption of ME / application. Battery capacity
is not available.
Charge-only mode: Allows charging while ME is detached from GSM network. When
started, the mode is indicated by the URC "SYSSTART CHARGE-
ONLY MODE". AT^SBC returns charger status and power
consumption of ME / application. Percentage of battery capacity is
not available. In Charge-only mode a limited number of AT
commands is accessible (see Table 9). There are several ways to
activate the Charge-only mode:
a) from Power Down mode: Connect charger while ME was powered
down with AT^SMSO
b) from Normal mode: Connect charger, then enter AT^SMSO.
Alarm mode: No charging functionality, i.e. charging does not start even though
the charger connects to the POWER lines. Battery parameters are
not available.
Charging begins once the charger connects to the POWER pins of the ZIF connector (except for the
Alarm mode). Please refer to the [1] ("Hardware Interface Description") supplied with your GSM
engine and the Application Note "Charging the Battery Pack" for details on the charging process.
Test command
AT^SBC=?
Response
^SBC: (list of supported <bcs>s),(list of supported <bcl>s),<mpc> module power
consumption
Defined values
<bcs> 0 No charging adapter is connected
1 Charging adapter is connected
2 Charging adapter is connected, charging in progress
3 Charging adapter is connected, charging has finished
4 Charging error, charging is interrupted
5 False charging temperature, charging is interrupted while
temperature is beyond allowed range
<bcl> Battery capacity
0, 20, 40, 60, 80, 100 percent of remaining capacity (6 steps)
0 indicates that either the battery is exhausted or the capacity value
is not available
<mpc> Average power consumption:
Value (0...5000) of average power consumption (mean value over a
couple of seconds) in mA. See read and write command for details.