User's Guide

ME910C1 HW User Guide
1VV0301351 Rev.11 Page 57 of 105 2019-06-21
If the digital output of the device to be connected with the GPIO input pad of ME910C1
has interface levels different from the 1.8V CMOS, then it can be buffered with an open
collector transistor with a 47K pull up to 1.8V supplied by VAUX/POWERMON R11 pad.
NOTE:
In order to avoid a back powering effect it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
ME910C1 when the module is powered off or during an ON/OFF
transition.
Refer to ME910C1 series AT command reference guide for GPIO
pins configuration.
5.9.2. Using a GPIO as OUTPUT
The GPIO pads, when used as outputs, can drive 1.8V CMOS digital devices or
compatible hardware. When set as outputs, the pads have a push-pull output and
therefore the pull-up resistor may be omitted.
5.9.3. Indication of network service availability
The STAT_LED pin status shows information on the network service availability and Call
status.
The function is available as alternate function of GPIO_01 (to be enabled using the
AT#GPIO=1,0,2 command).
In the ME910C1 modules, the STAT_LED needs an external transistor to drive an
external
LED and its voltage level is defined accordingly to the table below:.
Device Status
Led Status