User manual
Quick Start Instructions
© 2009 Microchip Technology Inc. DS51837A-page 33
1.3.2.17 SAVE THE SCRIPT FILE AND PROGRAMMING THE MCP4728 DAC
REGISTERS
1. Type in any script name (i.e., MCP4728_W_PDown) in the space below the
Script Name menu.
2. Click Save Script button.
3. Click Execute Script button.
4. You can also see the SCL and SDA waveforms using the Oscilloscope.
5. Read the V
OUT
voltage at the V
OUT
test pins:
Once this command is executed, all analog voltage outputs (V
OUT
) will be “zero”, and
the analog output pins (V
OUT
) are internally connected with about 500 kΩ.
Note: At this point, the PICkit Serial transmits the I
2
C 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 re-check the parameter values
including the order of parameters under the “Script Detail” column including
the I
2
C address of the device, and try again until the “Busy” LED turns OFF
immediately after sending the I
2
C command.