Digilent chipKIT Network Shield Manuel de référence et guide de l'utilisateur - Page 9

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chipKIT Network Shield Reference Manual

different value is needed or some other device

on the bus is providing the pull-ups or if I

C #2

isn't being used and the pull-ups are interfering

with the use of the pins. The on-board pull-ups

are enabled by install shorting blocks on JP10

and JP11. Removing the shorting blocks

disables the pull-ups.

Digilent has several small I/O modules

available that can be connected using the I

connector. These include a 3-axis

accelerometer, 4-channel, 12-bit A/D

converter, serial character LCD panel, 3-axis

gyroscope, real-time clock/calendar, and I/O

expander.

EEPROM: A 256Kbit (32Kbyte), I

C EEPROM

is provided using a Microchip 24LC256. This

EEPROM, IC5, is located on the bottom of the

board.

The EEPROM is on I

C bus #1, and its seven

C device address is '1010000'.

bit I

Digilent provides a library for accessing this

EEPROM. The library is available on the

Digilent web site and in the third party libraries

repository on github.

For complete technical documentation on the

24LC256, refer to the data sheet available on

the Microchip web site.

32.768Khz Oscillator

A 32.768Khz oscillator is provided to use as a

clock source for the Real Time Clock/Calendar

(RTCC) peripheral in the PIC32MX796

microcontroller on the Max32 board. The

output of this oscillator connects to pin 12 or

connector J11.

On the Max32 board, this signal connects to

signal RC13, which connects to pin 73 on the

PIC32 microcontroller. This pin provides the

secondary oscillator input, which can be used

to clock the RTCC in the PIC32

microcontroller.

www.digilentinc.com

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