User's Manual

LE920A4 HW User Guide Hardware Interfaces
Doc#: 1VV0301261 General Purpose I/O
Rev. 4.3 Page 90 of 123 2017-12-07
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 digital values (high or low) present on the pad at
reading time. Output pads can only be written to or queried and set the value of the pad
output. An alternate function pad is internally controlled by the module’s firmware and acts
depending on the implemented function.
The following GPIOs are available as a primary function in the module.
Table 40: Primary GPIOs
PAD Signal I/O Function Type
Drive
Strength
F9 GPIO_01 I/O Configurable GPIO CMOS 1.8V 2-16 mA
E10 GPIO_02 I/O Configurable GPIO CMOS 1.8V 2-16 mA
F11 GPIO_03 I/O Configurable GPIO CMOS 1.8V 2-16 mA
E12 GPIO_04 I/O Configurable GPIO CMOS 1.8V 2-16 mA
F13 GPIO_05 I/O Configurable GPIO CMOS 1.8V 2-16 mA
E14 GPIO_06 I/O Configurable GPIO CMOS 1.8V 2-16 mA
W19 GPIO_10 I/O Configurable GPIO CMOS 1.8V 2-16 mA
AN4 GPIO_20 I/O Configurable GPIO CMOS 1.8V 2-16 mA
The additional signals below can be used as GPIOs if their initial functionality is not used.
Table 41: Additional GPIOs
PAD Signal I/O Initial Function Alternate Function Type
Drive
Strength
Y3 GPIO_13 I/O WIFI_SDRST Configurable GPIO CMOS 1.8V 2-16 mA
AB3 GPIO_14 I/O WIFI_SDIO_CMD Configurable GPIO CMOS 1.8V 2-16 mA
AD3 GPIO_15 I/O WIFI_SDIO_D0 Configurable GPIO CMOS 1.8V 2-16 mA
AF3 GPIO_16 I/O WIFI_SDIO_D1 Configurable GPIO CMOS 1.8V 2-16 mA
AH3 GPIO_17 I/O WIFI_SDIO_D2 Configurable GPIO CMOS 1.8V 2-16 mA