MCP4431 Microchip Technology Inc., MCP4431 Datasheet - Page 57

• Manufacturer Part Number: MCP4431
• Description: 7/8-bit Volatile Quad Digital Pot With I 2c Interface
• Manufacturer: Microchip Technology Inc.

7.2
Only the Read Command and the Write Command
have Data Byte(s).
The Write command concatenates the 8 bits of the
Data Byte with the one data bit (D8) contained in the
Command Byte to form 9 bits of data (D8:D0). The
Command Byte format supports up to 9 bits of data so
that the 8-bit resistor network can be set to Full-Scale
(100h or greater). This allows wiper connections to
Terminal A and to Terminal B. The D9 bit is currently
unused.
TABLE 7-3:
 2010 Microchip Technology Inc.
Write Data
Read Data
Increment Wiper
Decrement Wiper
High Voltage
High Voltage
High Voltage
High Voltage
Data Byte
Write Data
Read Data
Increment Wiper
Decrement Wiper
COMMANDS
Command Name
7.3
If the four address bits received (AD3:AD0), and the
two command bits received (C1:C0), are a valid
combination, the MCP44XX will Acknowledge the I
bus.
If the address bits and command bits are an invalid
combination, then the MCP44XX will Not Acknowledge
the I
When an error condition has occurred, any commands
that follow are ignored until the I
Start Condition.
7.3.1
A Restart or Stop condition in the expected data bit
position will abort the current command sequence and
data will not be written to the MCP44XX.
2
C bus.
Error Condition
ABORTING A TRANSMISSION
MCP443X/5X
# of Bits
2
C bus is reset with a
29
29
20
20
29
29
20
20
DS22267A-page 57
HVC pin?
(V
Voltage
High
IHH
Yes
Yes
Yes
Yes
—
—
—
—
) on
2
C