BGS3 Hardware Interface Description
3.3 Power Up / Power Down Scenarios
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BGS3_HD_v01.000d
Page 33 of 109
2010-03-26
Confidential / Released
While BGS3 is in Power-down mode the application interface is switched off and must not be
fed from any other source. Therefore, your application must be designed to avoid any current
flow into any digital lines of the application interface, especially of the serial interfaces.
Figure 8:
Signal states during turn-off procedure
Note 1: Depending on capacitance load from host application.
3.3.4
Automatic Shutdown
Automatic shutdown takes effect if:
•
the BGS3 board is exceeding the critical limits of overtemperature or undertemperature
•
the battery is exceeding the critical limits of overtemperature or undertemperature
•
undervoltage or overvoltage is detected
See Charge-only mode described in
for exceptions.
The automatic shutdown procedure is equivalent to the Power-down initiated with the AT^SM-
SO command, i.e. BGS3 logs off from the network and the software enters a secure state
avoiding loss of data.
Alert messages transmitted before the device switches off are implemented as Unsolicited Re-
sult Codes (URCs). The presentation of these URCs can be enabled or disabled with the two
AT commands AT^SBC and AT^SCTM. The URC presentation mode varies with the condition,
please see
for details. For further instructions on AT com-
mands refer to
.
