Datasheet

chipKIT™ Pro MX7 Board Reference Manual

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Page 19 of 35

 JF-02 – SCL5

 JF-03 – SDA5

11.1 On-Board I

C Peripheral Device

The chipKIT Pro MX7 provides one on-board I

C peripheral device, a Microchip 24LC256 serial EEPROM. This

device is connected to I2C2. The 24LC256 is a 256Kbit (32Kbyte) serial EEPROM device to provide non-volatile

memory storage. The device address for the 24LC256 is 1010000 (0x50).

When using the MPIDE software, this device can be accessed using the Wire library Wire object, or using the

DTWI library via the DTWI1 object class.

Refer to the Microchip data sheet for detailed information on the operation of this device.

12 Analog Inputs

The PIC32MX795 microcontroller provides a 10-bit analog to digital (A/D) converter that provides up to sixteen

analog inputs. The chipKIT Pro MX7 board provides access to 10 of these inputs via the Pmod connectors. The

converted values produced by the A/D converter will be in the range 0–1023.

For detailed information on the operation and use of the A/D converter, refer to the PIC32 Family Reference

Manual, Section 17, 10-bit AD Converter.

The analog inputs are accessed using the analogRead() function in the MPIDE software. The analog input pin

number is specified using the symbols A0–A9. The digital pin numbers for the pins or the numbers 0–9 can also be

used, but using the symbols A0–A9 is recommended.

The following gives the Pmod connector position, digital pin number, microcontroller I/O port, and bit number for

the analog inputs:

 A0 – JA-01, digital pin 0, RB02

 A1 – JA-02, digital pin 1, RB03

 A2 – JA-03, digital pin 2, RB04

 A3 – JA-04, digital pin 3, RB06

 A4 – JA-07, digital pin 4, RB07

 A5 – JA-08, digital pin 5, RB08

 A6 – JA-09, digital pin 6, RB09

 A7 – JA-10, digital pin 7, RB10

 A8 – JC-07, digital pin 20, RB15

 A9 – JC-10, digital pin 23, RB14

12.1 A/D Converter Voltage Reference

The PIC32 microcontroller provides two voltage reference inputs to the analog to digital converter. Vref- is used

set the lower reference level and Vref+ is used to set the upper reference level. These references can be connected

to internal references or to external references using two of the analog input pins.