User's Manual

L
LE920 Hardware User Guide
1vv0301026 Rev.0 - draft4 – 2013-05-
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 56 of 76
11. General Purpose I/O
The general-purpose I/O pads can be configured to act in three different ways:
x input
x output
x 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 LE920 firmware and acts depending on
the function implemented.
The following GPIOs are available on the LE920.
PAD Signal I/O Function Type Drive Strength
F9
GPIO_01 I/O Configurable GPIO
BH-PD(*)
1.8V
2 mA
E10
GPIO_02 I/O
Configurable GPIO BH-PD(*)
1.8V
2 mA
F11
GPIO_03 I/O
Configurable GPIO BH-PD(*)
1.8V
2 mA
E12
GPIO_04 I/O
Configurable GPIO BH-PD(*)
1.8V
2 mA
F13
GPIO_05 I/O
Configurable GPIO BH-PD(*)
1.8V
2 mA
E14
GPIO_06 I/O
Configurable GPIO BH-PD(*)
1.8V
2 mA
R18
GPIO_07 I/O
Configurable GPIO BH-PD(*)
1.8V
2 mA
S19
GPIO_08 I/O Configurable GPIO
BH-PD(*)
1.8V
2 mA
U19
GPIO_09 I/O Configurable GPIO
BH-PD(*)
1.8V
2 mA
W19
GPIO_10 I/O Configurable GPIO
BH-PD(*)
1.8V
2 mA
(*) BH-PD - Bidirectional digital with CMOS input; High-voltage tolerant; Contains an
internal pull-down device.
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.