MCP4726 datasheet(49/86 Pages) MICROCHIP

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DS22272A-page 49

MCP4706/4716/4726

6.0

MCP47X6 I2C COMMANDS

The I2C protocol does not specify how commands are

formatted, so this section specifies the MCP47X6’s I2C

command formats and operation.

The commands can be grouped into the following

categories:

• Write memory

• Read memory

• General Call commands

The supported commands are shown in Table 6-2.

Many of these commands allow for continuous

operation. This means that the I2C Master does not

generate a Stop bit but repeats the required data/

clocks. This allows faster updates since the overhead

of the I2C control byte is removed. Table 6-1 shows the

supported commands and the required number of bit

clocks for both single and continuous commands.

Write commands, determined by the R/W bit = ‘0’, use

up to three command codes bits (C2:C0) to determine

the write’s operation.

The Read command is strictly determined by the R/W

bit = ‘1’. There are two formats of the command. One

for 12-bit and 10-bit devices and a second for 8-bit

devices.

The

General

Call

commands

utilize

the

I2C

specification reserved General Call command address

and command codes.

TABLE 6-1:

I2C COMMANDS - NUMBER

OF CLOCKS

6.0.1

ABORTING A TRANSMISSION

A Restart or Stop condition in an expected data bit

position will abort the current command sequence and

data will not be written to the MCP47X6.

TABLE 6-2:

MCP47X6 SUPPORTED COMMANDS

Command

# of Bit

Clocks

(1)

Operation

Mode

Write Volatile DAC Register

Command (2)

Single

Continuous 18n + 11

Write Volatile Memory

Command

Single

Continuous 27n + 11

Write All Memory Command

Single

Continuous 27n + 11

Write Volatile Configuration

bits Command

Single

Continuous

9n + 11

Read Command (12 and 10-bit

DAC register) (2)

Single

Continuous 54n + 11

Read Command (8-bit DAC

Single

Continuous 36n + 11

Note 1:

“n” indicates the number of times the

command operation is to be repeated.

This command is useful to determine when

an EEPROM programming cycle has

completed (RDY/BSY status bit)

Command

Code

(Note 1) Command Name

Writes Volatile

Memory?

Writes

EEPROM

Memory?

Command

during

EEPROM

Write Cycle?

Comment

C2 C1 C0

Config. DAC Config. DAC

Write Volatile DAC Register

Command (Note 2)

PD1:PD

0 only

Yes

Writes

volatile

Power

Down bits so can also be

used to exit a power down

state.

Write Volatile Memory Command

Yes

Write All Memory Command

Yes

Write Volatile Configuration bits

Command

Yes

Reserved

N.A.

Reserved (Note 3)

N.A.

Reserved (Note 3)

N.A.

Read Command

N.A.

Yes

Determined by R/W bit in

I2C Control byte

General Call Reset

N.A.

Determined by General

Call command byte after

the

I2C

General

Call

address.

General Call Wake-up

N.A.

Note 1:

These bits are the MSb of the 2nd byte in the I2C write command. See Figure 6-1 to Figure 6-4.

X = Don’t Care bit. This command format does not use C0 bit.

Device operation is not specified.

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