MCP4728EV datasheet(28/50 Pages) MICROCHIP

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MCP4728 Evaluation Board User’s Guide

DS51837A-page 24

1.3.2.10

EXAMPLE 5: SINGLE WRITE COMMAND FOR DAC INPUT REGISTER

AND EEPROM

This command writes to a single DAC input register and its EEPROM. Both input

EEPROM program activity can be monitored through the RDY/BSY bit and pin. See the

MCP4728 data sheet for details.

Figure 1-16 shows an example of writing a script file. In this example, the PICkit Serial

Analyzer sends a single write command to the MCP4728 for the DAC A (Channel A)

input register.

FIGURE 1-16:

Writing Script File to Write the Channel A Register and its EEPROM with FFFh Using

a Single Write Command. The Channel A output is updated immediately with the ACK Pulse. This example

uses UDAC Bit, instead of using LDAC pin, to update the DAC output.

• Parameters in the Script Detail column:

To change value:

•

Click this box and

type a new value

To delete or Insert box:

•

Select the box and

right click the mouse

button for options

available

Make sure the listed

parameters in “script

Detail” are in the exact

order as shown here.

Script Detail

I2CSTART

I2CWRTBYT

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

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

-------> Command Type and selection of Channel A.

-------> Configuration register bits and data nibble for Channel A.

-------> Data byte for Channel A (register and its EEPROM).

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).

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