MCP4728 datasheet(34/50 Pages) MICROCHIP

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MCP4728 Evaluation Board User’s Guide

DS51837A-page 30

1.3.2.14

EXAMPLE 7: TESTING EEPROM FEATURES

The device will upload the EEPROM data to both input and output DAC registers (a)

during power-up sequence or (b) when it receives the General Call Reset command.

One of these conditions makes the analog outputs available immediately with their

current EEPROM settings. Note that the Power-Down bit must be cleared for the

output.

• Testing Procedure:

Write to the EEPROM with one of the examples shown earlier (i.e.,

Section 1.3.2.12 “Example 6: Sequential Write for DAC Input Registers and

EEPROM”).

Measure and record the analog voltage of each channel (VOUT) using a

multimeter.

Turn-off the VDD of the device. If you are using the VDD from the PICkit Serial

Analyzer, disconnect JP1 connect.

Turn-back on the VDD again and measure the analog voltage (VOUT) of each

channel again. Confirm the VOUT is the same as in Step (b).

1.3.2.15

EXAMPLE 8: READING DAC REGISTERS AND EEPROM

This example shows how to read back the DAC input registers and EEPROM data.

Figure 1-20 shows the PICkit Serial script file to read all DAC input registers and

EEPROM data. Once this file is executed, the PC GUI will show you the contents of the

registers and EEPROM.

FIGURE 1-20:

Reading the DAC Registers and its EEPROM with a Read Command. See

Figure 1-21 for Details in Reading Data.

18h = 24 (decimal):

Requesting 24 bytes.

Read Command

Reading Data

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