Siemens AC75 manual SBC Overvoltage warning, SBC Overvoltage shutdown, Bcsnum, Bclnum, Mpcnum

AC75 AT Command Set

19.4 AT^SBC

s

URC 2

^SBC: Overvoltage warning

This URC is an alarm indicator displayed when the supply voltage approaches its maximum level. The URC appears only once.

URC 3

^SBC: Overvoltage shutdown

This URC will be reported when the voltage exceeds the maximum level specified in the Hardware Interface Description [2]. It appears only once before the module starts to perform an orderly shutdown.

In applications powered from Lithium batteries the incorporated protection circuit typically prevents over- charging, thus eliminating the risk of overvoltage conditions. Yet, in case of charging errors, for example caused by a bad battery or due to the absence of a battery protection circuit, the module's overvoltage shut- down function will take effect to avoid overcharging.

Parameter Description

<bcs>(num)

Connection status of battery pack

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>(num)

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. "100" indicates a remain- ing capacity between 81 and 100 percent, "80" indicates 61 ... 81 percent, and so on.

While charging is in progress (charging adapter connected) the battery capacity is not available. Consequently, parameter <bcl>=0. To query the battery capacity disconnect the charger.

<mpc>(num)

Current consumption of the host application as specified with parameter <current>.

<current>(num)

0(P)...5000	Enter the current consumption of your host application in mA. This information
	enables AC75 to correctly determine the end of charging and terminate charg-
	ing automatically when the battery is fully charged. Note that if <current> is
	inaccurate, and the application draws a current higher than the final charge

current, either charging will not be terminated or the battery fails to reach its maximum voltage. Therefore, the termination condition is defined as: current consumption dependent on operating mode of the ME plus current consump- tion of the external application. If used, the current flowing over the VEXT pin of the application interface must be added, too.

The specified value will also be displayed as parameter <mpc> of the AT^SBC read command.

When the AC75 is powered down or reset, the value of <current> is restored to its default. This affects the charging control. Therefore, the parameter should be set every time when needed after rebooting the AC75.

AC75_ATC_V01.002	Page 487 of 569	10/30/06
Confidential / Released