Gemalto M2M GmbH ELS81-US 사용자 설명서
Cinterion
®
ELS81-US Hardware Interface Description
3.2 Power Up/Power Down Scenarios
77
els81-us_hid_v01.004
2017-09-27
Confidential / Preliminary
Page 60 of 107
3.2.2.2
Restart ELS81-US Using EMERG_RST
The EMERG_RST signal is internally connected to the main module processor. A low level for
more than 10ms sets the processor and with it all the other signal pads to their respective reset
state. The reset state is described in
more than 10ms sets the processor and with it all the other signal pads to their respective reset
state. The reset state is described in
as well as in the figures showing the startup
behavior of an interface.
After releasing the EMERG-RST line, i.e., with a change of the signal level from low to high,
the module restarts. The other signals continue from their reset state as if the module was
switched on by the ON signal.
the module restarts. The other signals continue from their reset state as if the module was
switched on by the ON signal.
Figure 34:
Emergency restart timing
It is recommended to control this EMERG_RST line with an open collector transistor or an open
drain field-effect transistor.
drain field-effect transistor.
Caution: Use the EMERG_RST line only when, due to serious problems, the software is not
responding for more than 5 seconds. Pulling the EMERG_RST 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 ELS81-US does not respond, if reset or shutdown via AT command fails.
responding for more than 5 seconds. Pulling the EMERG_RST 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 ELS81-US does not respond, if reset or shutdown via AT command fails.
BATT+
ON
EMERG_RST
VCORE
V180
VDDLP
>10ms
System
started
System
started again
Reset
state
Ignition