MCP2221 Breakout Module User’s Guide
DS50002282A-page 18 2014 Microchip Technology Inc.
3.3 CONFIGURING PARAMETERS
As depicted in Figure 3-1, the MCP2221 Breakout Module user interface is divided into
three parts:
• Commands Panel
• Settings Panel
• Operating Status Box
3.3.1 Commands Panel
Figure 3-2 shows a detailed view of the Commands panel.
FIGURE 3-2: COMMANDS PANEL
3.3.1.1 “ON” CHECK BOX
This check box is used when pressing the Send All button. Data lines that have the
check box enabled will be sent to the slave.
3.3.1.2 “PROTOCOL” FIELD
This field allows selecting between I
2
C and SMBus.
3.3.1.3 “ADDRESS LENGTH” FIELD
This field allows setting the address length for the slave address to 7 bit or 8 bit.
3.3.1.4 “R/W” FIELD
This field specifies whether the command sent to the slave is a read or a write
operation.
3.3.1.5 “REGISTER INDEX” FIELD
This field is used only for SMBus communication and specifies the register address on
which the operation will take place.
3.3.1.6 “DATA” FIELD
The content of this field varies depending on the Read/Write selection.
For a “Read” operation, the data field will contain a single value, specifying the number
of bytes that will be read from the slave.
For a “Write” operation, the data field will contain the data bytes that will be sent to the
slave. Values should be separated by commas. The following formats are accepted for
hexadecimal representation: 0xFF and FF.
The data field can be left empty for write commands. This can be used to scan the bus
and verify that the slave responds correctly.
