Specifications

Table Of Contents
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ALAS5V Hardware Interface Description
4.2 Power Up/Power Down Scenarios
96
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 75 of 124
4.2.3.3 Turn off ALAS5V Using IGT Line
The IGT line can be configured for use in two different switching modes: You can set the IGT
line to switch on the module only, or to switch it on and off. The switching mode is determined
by the parameter "MEShutdown/OnIgnition" of the AT^SCFG command.
By factory default, the ON/OFF switch mode of IGT is disabled:
To configure IGT for use as ON/OFF switch:
Take great care before changing the switching mode of the IGT line. To ensure that the IGT
line works properly as ON/OFF switch it is of vital importance that the following conditions are
met:
Switch-on condition: If the ALAS5V is off, the IGT line must be asserted for at least 100 milli-
seconds before being released.
Switch-off condition: If the ALAS5V is on, the IGT line must be asserted for at least 2.1 sec-
onds before being released. The module switches off after the line is
released. The switch-off routine is identical with the procedure initiated
by AT^SMSO, i.e. the software performs an orderly shutdown as
described in Section 4.2.3.1.
Before switching off the module wait at least 32 seconds after startup.
Figure 30: Timing of IGT if used as ON/OFF switch
AT^SCFG=”MEShutdown/OnIgnition”
^SCFG: "MEShutdown/OnIgnition","off"
OK
# Query the current status of IGT.
# IGT can be used only to switch on ALAS5V.
IGT works as described in Section 4.2.1.
AT^SCFG=”MEShutdown/OnIgnition”,”on
^SCFG: "MEShutdown/OnIgnition","on"
OK
# Enable the ON/OFF switch mode of IGT.
# IGT can be used to switch on and off ALAS5V.
1 2
>32s
> 100ms >2.1s
1 TriggersswitchONroutine
2 TriggersswitchOFFroutine
IGT