User's Manual

HE920 Hardware User Guide
1vv0301014 Rev.9 – 2014-01-23
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 57 of 84
11. General Purpose I/O
The general-purpose I/O pads can be configured to act in three different ways:
 input
 output
 alternate function (internally controlled)
Input pads can only be read and report the digital value (high or low) present on the pad at the
read time; output pads can only be written or queried and set the value of the pad output; an
alternate function pad is internally controlled by the HE920 firmware and acts depending on
the function implemented.
The following GPIOs are available on the HE920.
PAD
Signal
I/O
Function
Type
Drive Strength
F9
GPIO_01
I/O
Configurable GPIO
B-PD
1.8V
2 mA
E10
GPIO_02
I/O
Configurable GPIO
B-PD
1.8V
2 mA
F11
GPIO_03
I/O
Configurable GPIO
B-PD
1.8V
2 mA
E12
GPIO_04
I/O
Configurable GPIO
B-PD
1.8V
2 mA
F13
GPIO_05
I/O
Configurable GPIO
B-PD
1.8V
2 mA
E14
GPIO_06
I/O
Configurable GPIO
B-PD
1.8V
2 mA
R18
GPIO_07
I/O
Configurable GPIO
B-PD
1.8V
2 mA
S19
GPIO_08
I/O
Configurable GPIO
B-PD
1.8V
2 mA
U19
GPIO_09
I/O
Configurable GPIO
B-PD
1.8V
2 mA
W19
GPIO_10
I/O
Configurable GPIO
B-PD
1.8V
2 mA
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 module when is powered OFF or during an
ON/OFF transition.