MCP4728 datasheet(19/50 Pages) MICROCHIP

19 / 50 page

Quick Start Instructions

DS51837A-page 15

• Modify the parameters in the Script Detail column as below:

1.3.2.3

SAVE THE SCRIPT FILE AND PROGRAMMING THE MCP4728 DAC

REGISTERS

Type in a script file name (i.e., MCP4728_W_VrfSel) 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 an Oscilloscope.

Script Detail

I2CSTART

I2CWRTBYT

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

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

--------> 1’st byte (000-0000) selecting external VREF.

I2CSTOP

Note:

All 6 parameters above must be listed in order. The parameters 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 Analyzer transmits the I2C Write Command

to the MCP4728 device. The saved file name will appear in the 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.

MCP4728 Datasheet(PDF) 19 Page - Microchip Technology