MCP4641-104ESLASHML datasheet(52/92 Pages) MICROCHIP

52 / 92 page

MCP454X/456X/464X/466X

DS22107A-page 52

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 MCP45XX/46XX 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 MCP45XX/46XX 7-bit com-

mands 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 MCP45XX/46XX (so com-

mand is Not Acknowledged) The MCP45XX/46XX

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 addi-

tional 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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