XT55 AT Command Set - Wireless Data Modules

XT55 AT Command Set18.3 AT^SBCs^SBC: UndervoltageThe message will be reported, for example, when the user attempts to set up a call while the voltage is close tothe critical limit and further power loss is caused during the transmit burst. When the external charging circuitincludes an NTC connected to the BATT_TEMP pin, the URC appears several times before the module switchesoff.The undervoltage protection is also efficient in applications which are not battery operated, i.e. where no NTC isconnected to the BATT_TEMP pin. To use this feature it is sufficient to issue the write command which automaticallyenables the presentation of URCs. You do not need to specify . Please note, that in contrastto applications with an NTC, XT55 will present the undervoltage URC only once and will then switch off withoutsending any further messages.Parameter Description (num)Connection status of battery pack0 No charging adapter is connected1 Charging adapter is connected2 Charging adapter is connected, charging in progress3 Charging adapter is connected, charging has finished4 Charging error, charging is interrupted5 False charging temperature, charging is interrupted while temperature isbeyond allowedrange (num)Battery capacity0, 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.While charging is in progress (charging adapter connected) the battery capacity is not available. Consequently,parameter =0. To query the battery capacity disconnect the charger. (num)Average current consumption.Value (0...5000) of average current consumption (mean value over a couple of seconds) in mA. is obtained from the XT55's current consumption, plus the value you have specified for the applicationby using the write command AT^SBC=. Remember that the current consumption of XT55 varies withits operating mode (IDLE, TALK, DATA, GPRS/DATA) and the power level.If was not yet specified and no battery pack NTC is detected returns only the module'spresent current consumption.If was not yet specified, but the NTC of the connected battery pack is detected, an offset value of200mA will, by default, be added. 200mA is an estimated value which represents the current consumption of atypical external application. Drawn from practical experience it serves as a precaution to ensure proper chargingin case you have not entered . It is strongly recommended that you enter the correct power consumptionof your application as described below. (num)Enter the current consumption of your host application in mA (0...5000). If used, the current provided over the2.9V VDD pin of the application interface (maximum 70mA) must be added, too.When the XT55 is powered down or reset, the value of is restored to its default. This affects thecharging control and disables the presentation of Unsolicited Result Codes. Therefore, the parameter should beset every time when needed after rebooting the XT55.XT55_ATC_V03.03 Page 416 of 459 9/9/05Confidential / Released