Specifications

Cinterion
®
EXS62-W/EXS82-W Hardware Interface Description
3.2 Power Up/Power Down Scenarios
102
t EXS62-W_EXS82-W_HID_v01.200ee 2022-09-02
Public/ Released
Page 72 of 144
3.2.5.2 Undervoltage Shutdown
The undervoltage shutdown threshold is the specified minimum supply voltage V
BATT+
given in
Table 2
1
. When the average supply voltage measured by EXSx2-W approaches the undervolt-
age shutdown threshold (i.e., 0.05V offset) the module will send the following URC:
^SBC: Undervoltage
If the undervoltage persists the module will send the URC several times before switching off
automatically.
This type of URC does not need to be activated by the user. It will be output automatically when
fault conditions occur.
Note: For battery powered applications it is strongly recommended to implement a BATT+ con-
necting circuit in order to not only be able save power, but also to restart the module after an
undervoltage shutdown where the battery is deeply discharged. Also note that the undervolt-
age threshold is calculated for max. 400mV voltage drops during transmit burst. Power supply
sources for external applications should be designed to tolerate 400mV voltage drops without
crossing the lower limits. For external applications operating at the limit of the allowed tolerance
the default undervoltage threshold may be slightly adjusted by subtracting an offset. For details
see [1]: AT^SCFG= "MEShutdown/sVsup/threshold".
3.2.5.3 Overvoltage Shutdown
The overvoltage shutdown threshold is the specified maximum supply voltage V
BATT+
given in
Table 2. When the average supply voltage measured by EXSx2-W approaches the overvoltage
shutdown threshold (i.e., 0.05V offset) the module will send the following URC:
^SBC: Overvoltage Warning
The overvoltage warning is sent only once - until the next time the module is close to the over-
voltage shutdown threshold.
If the voltage continues to rise above the specified overvoltage shutdown threshold, the module
will send the following URC:
^SBC: Overvoltage Shutdown
This alert is sent only once before the module shuts down cleanly without sending any further
messages.
This type of URC does not need to be activated by the user. It will be output automatically when
fault conditions occur.
Keep in mind that several EXSx2-W components are directly linked to BATT+ and, therefore,
the supply voltage remains applied at major parts of EXSx2-W. Especially the power amplifier
linked to BATT+
RF
is sensitive to high voltage and might even be destroyed.
1. Please note that the threshold for an automated undervoltage shutdown only applies in case GSM is
not activated. With EXS82-W however, GSM might be activated, and in this case the external application
needs to ensure that the minimum supply voltage does not fall below 3.3V including GSM drops, ripple,
spikes. Else the GSM performance might be restricted.