MCP4728 datasheet(23/50 Pages) MICROCHIP

23 / 50 page

Quick Start Instructions

DS51837A-page 19

• Parameters in the Script Detail column:

1.3.2.7

SAVE THE SCRIPT FILE AND PROGRAMMING THE MCP4728 DAC

REGISTERS

Type in any script name (i.e., MCP4728_W_Fast) 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 pads:

In order to update the DAC output register, the LDAC pin must be “Low”.

• Press “S1” button in the MCP4728 Evaluation Board.

The device will update the VOUT as soon as the LDAC pin switch S1 is pressed.

You can now measure the DAC output voltages (VOUT A, VOUT B, VOUT C, VOUT D)

using a voltmeter. When Examples 1, 2, and 3 are executed sequentially, all channels

use an internal reference. Figure 1-13 shows the expectation of each DAC channel out-

puts.

Script Detail

I2CSTART

I2CWRTBYT

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

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

-------> 1st byte of DAC A Register (Channel A) = 0000-1111

-------> 2nd byte of DAC A Register (Channel A) = 1111-1111

-------> 1st byte of DAC B Register (Channel B) = 0000-0111

-------> 2nd byte of DAC B Register (Channel B) =1111-1111

-------> 1st byte of DAC C Register (Channel C) = 0000-0011

-------> 2nd byte of DAC C Register (Channel C) = 1111-1111

-------> 1st byte of DAC D Register (Channel D) = 0000 -0001

-------> 2nd byte of DAC D Register (Channel D) = 1111-1111

I2CSTOP

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.

MCP4728 Datasheet(PDF) 23 Page - Microchip Technology

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