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OLIMEX© 2024
4.2 UEXT connectors
MOD-IO2 board has two UEXT connectors (male and female) and can interface Olimex's UEXT boards.
For more information on UEXT please visit:
https://www.olimex.com/Products/Modules/UEXT/
4.2.1 Female connector
The female connector is used either to connect to a board directly (without using the female-female cable)
or to connect the module to another MOD-IO2 – to create a stackable module that can be addressed via
the I2C. Remember to change the I2C address of each board when using multiple boards. By default the
I2C address is 0x21.
Pin # Signal name
1
+3.3V out*
2
GND
3
Not connected
4
Not connected
5
SCL
*Pin 1 is disconnected by default (can be enabled by modifying jumper UEXT_FPWR_E1). To avoid
short-circuit with other modules that might also have 3.3V out.
I2C pins SCL and SDA have 4.7k pull-up resistors enabled by default. They can be disconnecting by
disconnecting jumpers SCL_E1 and SDA_E1.
4.2.2 Male connector
The male connector is used with the ribbon cable in the package to connect to another male UEXT or to
connected to another MOD-IO2.
Pin # Signal name
1
+3.3V out*
2
GND
3
Not connected
4
Not connected
5
SCL
*Pin 1 is disconnected by default (can be enabled by modifying jumper UEXT_MPWR_E1). To avoid
short-circuit with other modules that might also have 3.3V out.
SCL and SDA have NO pull-ups.
Female UEXT
Pin # Signal name
6
SDA
7
Not connected
8
Not connected
9
Not connected
10
Not connected
Male UEXT
Pin # Signal name
6
SDA
7
Not connected
8
Not connected
9
Not connected
10
Not connected
Page 18 of 28
MOD-IO2 user's manual
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