MCP4451 datasheet(58/94 Pages) MICROCHIP

58 / 94 page

MCP443X/5X

DS22267A-page 58

 2010 Microchip Technology Inc.

7.4

Write Data

Normal and High Voltage

The Write Command format, see Figure 7-2, includes

the I2C Control Byte, an A bit, the MCP44XX Command

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

SINGLE WRITE TO VOLATILE

MEMORY

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 Figure 7-2 for the byte write sequence.

7.4.2

CONTINUOUS WRITES TO

VOLATILE MEMORY

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 I2C Control Byte.

Figure 7-3 shows the sequence for three continuous

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

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 VDD signal.

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