ML865G1 HW Design Guide
1VV0301632 Rev. 4 Page 54 of 86 2020-09-23
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
ML865G1 when the module is powered off or during an ON/OFF
transition.
Refer to ML865G1 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_08 (to be enabled using the
AT#GPIO=1,0,2 command).
In the ML865G1 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 off Permanently off
Not Registered Permanently on
Registered in idle Blinking 1sec on + 2 sec off
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