MCP4431 Microchip Technology Inc., MCP4431 Datasheet - Page 58

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

MCP443X/5X
7.4
The Write Command format, see
the I
Byte, an A bit, the MCP44XX Data Byte, an A bit, and
a Stop (or Restart) condition. The MCP44XX generates
the A / A bits.
A Write command to a Volatile memory location
changes that location after a properly formatted Write
Command and the A / A clock have been received.
7.4.1
For volatile memory locations, data is written to the
MCP44XX after every byte transfer (during the
Acknowledge). If a Stop or Restart condition is
generated during a data transfer (before the A), the
data will not be written to the MCP44XX. After the A bit,
the master can initiate the next sequence with a Stop or
Restart condition.
Refer to
DS22267A-page 58
2
C Control Byte, an A bit, the MCP44XX Command
Figure 7-2
Write Data
Normal and High Voltage
SINGLE WRITE TO VOLATILE
MEMORY
for the byte write sequence.
Figure
7-2, includes
7.4.2
A continuous write mode of operation is possible when
writing to the volatile memory registers (address 00h,
01h, 04h, 06h, 07h, and 0Ah). This continuous write
mode allows writes without a Stop or Restart condition
or repeated transmissions of the I
Figure 7-3
writes. The writes do not need to be to the same volatile
memory address. The sequence ends with the master
sending a STOP or RESTART condition.
7.4.3
The High Voltage Command (HVC) signal is
multiplexed with Address 0 (A0) and is used to indicate
that the command, or sequence of commands, are in
the High Voltage operational state.
The HVC pin has an internal resistor connection to the
MCP44XXs internal V
shows the sequence for three continuous
CONTINUOUS WRITES TO
VOLATILE MEMORY
THE HIGH VOLTAGE COMMAND
(HVC) SIGNAL
DD
 2010 Microchip Technology Inc.
signal.
2
C Control Byte.