MCP4641 datasheet(54/102 Pages) MICROCHIP

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MCP453X/455X/463X/465X

DS22096B-page 54

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7.4

Write Data

Normal and High Voltage

The Write command can be issued to both the volatile

and nonvolatile memory locations. The format of the

command (see Figure 7-2), includes the I2C Control

Byte, an A bit, the MCP4XXX Command Byte, an A bit,

the MCP4XXX Data Byte, an A bit, and a Stop (or

Restart) condition. The MCP4XXX 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

MCP4XXX after every byte transfer (during the

Acknowledge). If a Stop or Restart condition is gener-

ated during a data transfer (before the A), the data will

not be written to the MCP4XXX. 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, and 04h). 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

multiplexed with Address 0 (A0) and is used to indicate

that the command, or sequence of commands, are in

the High Voltage operational state. High Voltage

commands allow the device’s WiperLock Technology

and write protect features to be enabled and disabled.

The HVC pin has an internal resistor connection to the

MCP45XX/46XXs internal VDD signal.

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