MCP4641 datasheet(53/102 Pages) MICROCHIP

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DS22096B-page 53

MCP453X/455X/463X/465X

7.2

Data Byte

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.

7.3

Error Condition

If the four address bits received (AD3:AD0) and the two

command bits received (C1:C0) are a valid combina-

tion, the MCP4XXX will Acknowledge the I2C bus.

If the address bits and command bits are an invalid

combination, then the MCP4XXX will Not Acknowledge

the I2C bus.

Once an error condition has occurred, any following

commands are ignored until the I2C bus is reset with a

Start Condition.

7.3.1

ABORTING A TRANSMISSION

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 MCP4XXX.

TABLE 7-3:

COMMANDS

Command Name

# of Bits

High

Voltage

(VIHH) on

HVC pin?

Write Data

—

Read Data

—

Increment Wiper

—

Decrement Wiper

—

High Voltage Write Data

Yes

High Voltage Read Data

Yes

High Voltage Increment Wiper

Yes

High Voltage Decrement Wiper

Yes

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