Digilent 410-295P-KIT - Manual (Page 19)

ChipKIT Pro MX4 Reference Manual
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Page 19 of 37
Pull-ups
Enabled Pull-ups
Disabled
11.1 Jumper Setting for I
2
C Pull Up Resistors
When using the ChipKIT Pro MX4 with the MPIDE and the chipKIT system, the I
2
C interfaces are accessed using the
standard chipKIT Wire library, or the Digilent DTWI library.
The Wire library supports a single I
2
C interface, I2C1 on J2. This is accessed using the Wire object.
The DTWI library supports both I
2
C interfaces. The DTWI0 object class is used to create an object for access to I2C1
and the DTWI1 object class is used to access I2C2.
The pinouts of the I
2
C daisy chain connectors are as follows:
Connector J2. I2C1
• J2-1 – SCL1
• J2-2 – SCL1
• J2-3 – SDA1
• J2-4 – SDA1
• J2-5 – GND
• J2-6 – GND
• J2-7 – BRD_3V3
• J2-8 – BRD_3V3
Connector J6, I2C2
• J6-1 – SCL2
• J6-2 – SCL2
• J6-3 – SDA2
• J6-4 – SDA2
• J6-5 – GND
• J6-6 – GND
• J6-7 – BRD_3V3
• J6-8 – BRD_3V3