Digi NS9210 - Manual (Page 50)

50 NS9210 Processor Module Hardware Reference
C h a p t e r 2
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I
2
C i n t e r f a c e
I
2
C header
The I²C interface has only one device connected to the bus on the development
board - an I/O expander (see next paragraph). Otherwise, additional I²C devices
(like EEPROMs) can be connected to the module by using I²C header X15. The
pinning of this header is provided below.
I
2
C digital I/O
expansion
The development board provides a 3.81mm (1.50") green terminal block , X44, for
additional digital I/Os. The I 2 C I/O port chip is on-chip ESD-protected, 5V tolerant,
and provides an open drain interrupt output .
I2C digital I/Os, X44 I2C header, X15
Pin Signal
1 I2C_SDA/GPIO103
2 +3.3V
3 I2C_SCL/GPIO102
4 GND