MCP4531 Microchip Technology Inc., MCP4531 Datasheet - Page 52

• Manufacturer Part Number: MCP4531
• Description: 7/8-bit Single/dual I 2 C Digital Pot With Non-volatile Memory
• Manufacturer: Microchip Technology Inc.

MCP454X/456X/464X/466X
6.2.7
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
in this figure as well.
This will allow customers to have multiple I
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 I
the customer will need two I
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
commands are specified by the I
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.
DS22107A-page 52
Note:
6-11. We have added a MCP45XX/46XX format
shows the General Call Commands. Three
GENERAL CALL
Only one General Call command per issue
of the General Call control byte. Any addi-
tional General Call commands are ignored
and Not Acknowledged.
2
C devices on the bus, then
2
C busses and ensure that
2
C specification and
2
C Digital
TABLE 6-3:
‘1000 00d’b Write Next Byte (Third Byte) to Volatile
‘1001 00d’b Write Next Byte (Third Byte) to Volatile
‘1100 00d’b Write Next Byte (Third Byte) to TCON
‘1000 010’b
‘1000 011’b
‘1001 010’b
‘1001 011’b
‘1000 100’b
‘1000 101’b
‘1001 100’b
‘1001 101’b
Note 1:
Command
(1, 2, 3)
7-bit
or
or
or
or
2:
3:
Any other code is Not Acknowledged.
These codes may be used by other
devices on the I
The 7-bit command always appends a “0”
to form 8-bits. .
“d” is the D8 bit for the 9-bit write value.
Wiper 0 Register
Wiper 1 Register
Register
Increment Wiper 0 Register
Increment Wiper 1 Register
Decrement Wiper 0 Register
Decrement Wiper 1 Register
GENERAL CALL COMMANDS
© 2008 Microchip Technology Inc.
2
Comment
C bus.