Specifications

Table Of Contents

Cinterion

PLSx3 Hardware Interface Description

2.1 Application Interface

t PLSx3_HID_v01.003 2021-03-12

Public / Released

Page 39 of 121

2.1.10.3 Fast Shutdown

The GPIO4 interface line can be configured as fast shutdown signal line FST_SHDN. The con-

figured FST_SHDN line is an active low control signal and must be applied for at least 1 milli-

seconds. If unused this line can be left open because of a configured internal pull-up resistor.

Before setting the FST_SHDN line to low, the IGT signal should be set to high (see Figure 14).

The fast shutdown feature can be triggered using the AT command AT^SMSO=<fso>. For de-

tails see [1].

If triggered, a low impulse >1 milliseconds on the FST_SHDN line starts the fast shutdown. The

fast shutdown procedure still finishes any data activities on the module's flash file system, thus

ensuring data integrity, but will no longer deregister gracefully from the network, thus saving

the time required for network deregistration.

Figure 14: Fast shutdown timing

Please note that the normal software controlled shutdown using AT^SMSO will allow option for

a fast shutdown by parameter <fso>, i.e., without network deregistration. However, in this case

no URCs including shutdown URCs will be provided by the AT^SMSO command.

Please also note that the fast shutdown operation does not allow the module deregister from

the network, therefore, this practice is not recommended, and should not be conducted on reg-

ular basis. If it is used for energy saving reason, for instance, used in battery-driven solutions

that require prompt system shutdown before battery depletion, discretion is advised in such

case.

BATT+

IGT

EMERG_RST

GPIO4/AT^SMSO=<fso>

(Fast Shut Down)

Internal Reset

V180

PWR_IND

< 15ms

Active low

Open Collector

High Z

Switch off procedure

fast shut down