Specifications

Cinterion
®
EXS62-W/EXS82-W Hardware Interface Description
2.1 Application Interface
61
t EXS62-W_EXS82-W_HID_v01.200ee 2022-09-07
Public/ Released
Page 42 of 144
Figure 20: Power indication circuit
2.1.11.3 Fast Shutdown
The FST_SHDN line triggers the module’s fast shutdown procedure. The fast shutdown proce-
dure ensures data integrity during shutdown, but will no longer deregister gracefully from the
network thus saving the time normally required for network deregistration. For fast shutdown
behavior and timings see Figure 21 as well asTable 7.
The FST_SHDN line is an active low control signal and must be applied via an open drain or
open collector circuit (see Table 2 for electrical characteristics). It is recommended to verify the
behavior of the external application especially during the boot and initialization phase against
back powering and unintentional fast shutdown.
It is recommended to keep the FST_SHDN line low until the module has shut down. A low level
of the V180 signal indicates that the module has entered the Power Down mode. No shutdown
URCs will be issued with a fast shutdown. Thus, it is recommended to monitor the V180 line by
the external application. Other reference voltage lines may still show a high level.
Once V180 is low, the external application can cut the module’s power supply.
In order not to trigger a restart loop of the module, the ON line shall be released by the external
application, and not be actively driven continuously.
22k
10k
100k
V180
Power
indication
External
power supply