MCP4725 datasheet(18/42 Pages) MICROCHIP

18 / 42 page

MCP4725

DS22039C-page 18

TABLE 6-2:

WRITE COMMAND TYPE

FIGURE 6-1:

Write Command for Fast Mode.

C2 C1 C0

Command Name

Function

Fast Mode

This command is used to change the DAC register. EEPROM is not affected

“

Write DAC Register

Load configuration bits and data code to the DAC Register

Write DAC Register

and

EEPROM

(a) Load configuration bits and data code to the DAC Register

and

(b) also write the EEPROM

Reserved

Reserved for future use

Reserved

Reserved for future use

Reserved

Reserved for future use

Reserved

Reserved for future use

Note 1: X = Dont’ Care. Fast Mode does not use C0 bit.

2: The MCP4725 ignores the “Reserved” commands.

1st byte (Device Addressing)

Device Code

Address

R/W

ACK (

MCP4725)

2nd byte

3rd byte

DAC Register Data (12 bits)

ACK (

MCP4725)

Repeat bytes of 2nd and 3rd bytes

Change DAC Code in Fast Mode: (C2,C1) = (0,0)

Fast Mode Command (C2, C1 = 0, 0)

ACK (

MCP4725)

Power Down Select

Start Bit

2nd byte

3rd byte

Read/Write Command

Stop Bit

see

Note 1

see

Note 2

ACK (

MCP4725)

see

Note 2

Note 1: A2 and A1 bits are programmed at the factory by hard-wired, and A0 bit is determined by the logic state

of A0 pin.

2: The device updates V

OUT at the falling edge of the ACK pulse of the 3rd byte.

0 A2

A1 A0

00 PD1 PD0 D11

D10 D9

D7 D6 D5 D4 D3

D2 D1

00 PD1 PD0 D11

D10 D9

D7 D6 D5 D4 D3

D2 D1

Bits

ACK (

MCP4725)

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