Specifications

Table Of Contents
Cinterion
®
ALAS5V Hardware Interface Description
4.2 Power Up/Power Down Scenarios
96
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 76 of 124
4.2.3.4 Turn off or Restart ALAS5V in Case of Emergency
Caution: Use the EMERG_OFF line only when, due to serious problems, the software is not
responding for more than 5 seconds. Pulling the EMERG_OFF line causes the loss of all infor-
mation stored in the volatile memory. Therefore, this procedure is intended only for use in case
of emergency, e.g. if ALAS5V does not respond, if reset or shutdown via AT command fails.
The EMERG_OFF line is available on the application interface and can be used to turn off or
to restart the module. In any case the EMERG_OFF line must be pulled to ground until the Pow-
er Down mode is reached, as indicated by PWR_IND=high. To control the EMERG_OFF line
it is required to use an open drain / collector driver. EMERG_OFF is pulled high internally.
Now, to permanently turn off the module, the IGT line has to be set to high (inactive) before the
EMERG_OFF line is released. The module will then switch off and needs to be restarted at a
later time. This switch off behavior is shown in Figure 31.
Figure 31: Shutdown by EMERG_OFF signal
To simply restart the module, the IGT line has to continue to be driven low (active) for at least
100ms after having released the EMERG_OFF line. The module will then switch off and restart
automatically. This restart behavior is shown in Figure 32.
Figure 32: Restart by EMERG_OFF signal
EMERG_OFF
PWR_IND
BATT+
IGT
2)
t
PD
1)
1) The time to Power Down mode (t
PD
) depends on the operating state, and can be up to 2000ms.
PWR_IND should be monitored by the external application. Note that a low impulse at
EMERG_OFF for more than 2000ms will reset the module’s RTC.
2) The the power supply voltage (BATT+) may be disconnected only after having reached Power
Down mode as indicated by the PWR_IND signal going high. The power supply has to be avail-
able (again) before the module is restarted.
EMERG_OFF
PWR_IND
BATT+
IGT
t
RESET
1)
Module on
Module off
Module on
1) The time to module reset (t
RESET
) must be > 100ms