phyCORE-OMAP44xx
Part I: PCM-049/phyCORE-OMAP44xx System on Module
L-760e_1 © PHYTEC Messtechnik GmbH 2012
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1.9 General Purpose I/Os
The phyCORE-OMAP44xx provides 3 GPIOs
1
. Beside these 3 dedicated GPIOs, most of the OMAP44xx signals
which are connected directly to the module connector can be configured to act as GPIOs, due to the multiplexing
functionality of most controller pins. The GPIO pins can be used as data input with an optional and configurable
debounce cell or data output. Furthermore the pins support an interrupt generation in active mode and
wake-up request generation in idle mode upon the detection of external events. With the pad configuration
feature of the OMAP44xx, you can also configure the GPIO to optionally have a pull-up or pull-down.
shows the location of the dedicated GPIO pins on the phyCORE-Connector, as well as the corresponding
ports of the OMAP44xx.
As can be seen in the table above the voltage level is VCC_1V8_IO. To avoid mismatch of different voltage levels
external devices connected to these pins should be supplied by the reference voltage VCC_1V8_IO.
The IO reference voltage (VCC_1V8_IO) is available at X1B30 (refer to
). Alternatively an open
drain circuit with a pull-up resistor attached to VCC_1V8_IO can be connected to the GPIOs of the
phyCORE-OMAP44xx.
1.
To support all features of the phyCORE-OMAP44xx Carrier Board special functions have been assigned to the GPIOs in the BSP
delivered with the module. In order to otherwise utilize the GPIOs the software must be changed.
assigned to the GPIO pins.
Pin #
Signal
I/O
SL
Description
X1A38
X_GPIO_115
I/O
1.8 V /
VCC_1V8_IO
GPIO 115
X1B39
X_GPIO_114
I/O
1.8 V /
VCC_1V8_IO
GPIO 114
X1D28
X_GPIO_WK30
I/O
1.8 V /
VCC_1V8_IO
GPIO WK30
Table 27:
Location of Dedicated GPIO Pins
Caution:
Please take care to not load the reference voltage VCC_1V8_IO too heavily to avoid any disfunction or damage
of the module. The maximum load is 400 mA.
