MCP4441 datasheet(58/100 Pages) MICROCHIP

58 / 100 page

MCP444X/446X

DS22265A-page 58

6.2.7

GENERAL CALL

The General Call is a method that the “Master” device

can communicate with all other “Slave” devices. In a

Multi-Master application, the other Master devices are

operating in Slave mode. The General Call address

has two documented formats. These are shown in

Figure 6-11. We have added a MCP44XX format in this

figure as well.

This will allow customers to have multiple I2C Digital

Potentiometers on the bus and have them operate in a

synchronous fashion (analogous to the DAC Sync pin

functionality). If these MCP44XX 7-bit commands

conflict with other I2C devices on the bus, then the

customer will need two I2C busses and ensure that the

devices are on the correct bus for their desired

application functionality.

Dual Pot devices can not update both Pot0 and Pot1

from a single command. To address this, there are

General Call commands for the Wiper 0, Wiper 1, and

the TCON registers.

Table 6-3 shows the General Call Commands. Three

commands are specified by the I2C specification and

are not applicable to the MCP44XX (so command is

Not Acknowledged) The MCP44XX General Call

Commands are Acknowledge. Any other command is

Not Acknowledged.

TABLE 6-3:

GENERAL CALL COMMANDS

Note:

Only one General Call command per issue

of the General Call control byte. Any

additional General Call commands are

ignored and Not Acknowledged.

7-bit

Command

(1, 2, 3)

Comment

‘1000 00d’b Write Next Byte (Third Byte) to Volatile

Wiper 0 Register

‘1001 00d’b Write Next Byte (Third Byte) to Volatile

Wiper 1 Register

‘1100 00d’b Write Next Byte (Third Byte) to TCON

‘1000 010’b

‘1000 011’b

Increment Wiper 0 Register

‘1001 010’b

‘1001 011’b

Increment Wiper 1 Register

‘1000 100’b

‘1000 101’b

Decrement Wiper 0 Register

‘1001 100’b

‘1001 101’b

Decrement Wiper 1 Register

Note 1:

Any other code is Not Acknowledged.

These codes may be used by other

devices on the I2C bus.

The 7-bit command always appends a “0”

to form 8-bits.

“d” is the D8 bit for the 9-bit write value.

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