MCP4728 datasheet(32/50 Pages) MICROCHIP

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MCP4728 Evaluation Board User’s Guide

DS51837A-page 28

• Parameters in the Script Detail column:

1.3.2.13

SAVE THE SCRIPT FILE AND PROGRAMMING THE MCP4728 DAC

REGISTERS

Type in any script name (i.e., MCP4728_W_SeqB) in the space below the Script

Name menu.

Click Save Script button.

Click Execute Script button.

You can also see the SCL and SDA waveforms using the Oscilloscope.

Read the VOUT voltage at the VOUT test terminals:

Since the UDAC bit is set to “0” in the command, the device will update the VOUT B, C,

and D outputs as soon as the command is executed regardless of the condition of the

LDAC pin switch S1.

Script Detail

I2CSTART

I2CWRTBYT

-------> This means there are eight bytes to send.

-------> Address byte = 1100-0000 (See Note).

-------> Command Type and Ch. B is a starting channel

-------> Configuration register bits and data nibble for Ch. B

-------> Data byte for Ch. B

-------> Data byte for Ch. C

-------> Configuration register bits and data nibble for Ch. D

I2CSTOP

-------> Data byte for Ch. D

-------> Configuration register bits and data nibble for Ch. C

Note:

All parameters above must be listed in order. The parameter above with *

are not modifiable. The MCP4728 device on the evaluation board has I2C

address bits (A2, A1, A0) = (0,0,0).

Note:

At this point, the PICkit Serial transmits the I2C Write Command to the

MCP4728 device. The saved file name will appear in Users I2C Scripts

column, and can be re-used any time by selecting the file name.

Note:

When you click on the “Execute Script” menu, the “Busy” LED on the PICkit

Serial Analyzer will momentarily turn on and then turn off. If the LED

remains ON, a communications problem has occurred. Remove the PICkit

Serial Analyzer from your computer and recheck the parameter values

including the order of parameters under the “Script Detail” column including

the I2C address of the device, and try again until the “Busy” LED turns OFF

immediately after sending the I2C command.

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