MCP4728 datasheet(36/66 Pages) MICROCHIP

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MCP4728

DS22187C-page 36

5.6.3

SEQUENTIAL WRITE COMMAND:

WRITE DAC INPUT REGISTERS

AND EEPROM SEQUENTIALLY

FROM STARTING CHANNEL TO

CHANNEL D

(C2=0, C1=1, C0=0; W1=1, W0=0)

When the device receives this command, it writes the

input data to the DAC input registers sequentially from

the starting channel to channel D, and also writes to

EEPROM

sequentially.

The

starting

channel

determined by the DAC1 and DAC0 bits. Table 5-2

shows the functions of the channel selection bits for the

sequential write command.

When the device is writing EEPROM, the RDY/BSY bit

stays “Low” until the EEPROM write operation is

completed. The state of the RDY/BSY bit flag can be

monitored by a read command or at the RDY/BSY pin.

Any new command received during the EEPROM write

operation (RDY/BSY bit is “Low”) is ignored. Figure 5-9

shows an example of the sequential write command.

Updating Analog Outputs:

The analog outputs can be updated by one of the

following

events

after

the

falling

edge

the

acknowledge clock pulse of the 4th byte.

When the LDAC pin or UDAC bit is “Low”.

If UDAC bit is “High”, bringing down the LDAC

pin to “Low” any time.

By sending the General Call Software Update

command.

5.6.4

SINGLE WRITE COMMAND: WRITE

A SINGLE DAC INPUT REGISTER

AND EEPROM

(C2=0, C1=1, C0=0; W1=1, W0=1)

When the device receives this command, it writes the

input data to a selected single DAC input register and

also to its EEPROM. The channel is selected by the

channel selection bits (DAC1 and DAC0). See Table

for the channel selection bit function. Figure 5-10

shows an example of the single write command.

Updating Analog Outputs:

The analog outputs can be updated by one of the

following

events

after

the

falling

edge

the

acknowledge clock pulse of the 4th byte.

When the LDAC pin or UDAC bit is “Low”.

If UDAC bit is “High”, bringing down the LDAC

pin to “Low” any time.

By sending the General Call Software Update

command.

Note 1: The UDAC bit can be used effectively to

upload the input register to the output

channel only, while the LDAC pin and

General Call Software Update command

affect all channels.

TABLE 5-2:

DAC CHANNEL SELECTION

BITS FOR SEQUENTIAL

WRITE COMMAND

DAC1

DAC0

Channels

Ch. A - Ch. D

Ch. B - Ch. D

Ch. C - Ch. D

Ch. D

Note 1: The UDAC bit can be used effectively to

upload the input register to the output

channel only, while the LDAC pin and

General Call Software Update command

affect all channels.

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