Reference Manual

91 ConnectCore 9M 2443 & Wi-9M 2443 Hardware Reference
Chapter 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital I/O
Manufacturer part number: BlockMaster MTS0900T
I2C digital I/O
expansion, X44
The development board provides a 3.81mm (1.50”) green terminal block, X44, for
additional digital I/Os. The I2C I/O port chip is on-chip ESD-protected, 5V tolerant,
and provides an open drain interrupt output.
The I/O expander is a Philips PCA9554D at I2C address 0x20 (bits A7..A1), or
0x40/0x41 if expressed in 8-bit format including the R/W bit at the end (bits A7..A1
+ R/W bit)."
The pins are allocated as shown below:
Digital I/O
connector, X44
Pin Function Pin Function
1IO_0 6IO_5