User manual

MCP46XXEV Evaluation Board User’s Guide

Double clicking on the MCP4661W0WR User I2CM Script will load the script details.

Figure 2-13 shows what the values mean in the Script Details. These values are hex

numbers.

The first value (03h), is the number of bytes that will be written. The second byte (5Eh)

is the MCP4661 I2C Slave Address with the R/W bit indicating a write (‘0’). The third

byte (00h) is a data byte and contains the Device Register Address, the Device

Command, and the two Most Significant bits (MSb) of the write data. The fourth byte

(7Fh) is the 2nd data byte and contains the remaining 8 bits of the write data.

FIGURE 2-13: Example Write Script.

Number of Bytes that will

be written

Data Byte #2 Data Byte #3

(Device Register Address + (Write Data “D7:D0”)

Command + Data bit “D8”)

Data Byte #1

(Device Slave Address + R/W bit)