MCP4728 datasheet(24/66 Pages) MICROCHIP

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MCP4728

DS22187C-page 24

4.4

DAC Input Registers and

Non-Volatile EEPROM Memory

Each channel has its own volatile DAC input register

and EEPROM. The details of the input registers and

EEPROM are shown in Table 4-1 and Table 4-2,

respectively.

TABLE 4-1:

INPUT REGISTER MAP (VOLATILE)

Configuration Bits

DAC Input Data (12 bits)

Bit

Name

RDY

/BSY

A2 A1 A0

VREF

DAC1 DAC0 PD1

PD0

D11 D10 D9 D8 D7 D6 D5

D4 D3 D2 D1 D0

Bit

Function

(Note 1)

I2C

Address Bits

(Note 2)

Ref.

Select

(Note 2)

DAC Channel

(Note 2)

Power-Down

Select

(Note 2)

Gain

Select

(Note 2)

CH. A

CH. B

CH. C

CH. D

Note 1: EEPROM write status indication bit (flag).

2: Loaded from EEPROM during power-up, or can be updated by the user.

TABLE 4-2:

EEPROM MEMORY MAP AND FACTORY DEFAULT SETTINGS

Configuration Bits

DAC Input Data (12 bits)

Bit Name

VREF

PD1

PD0

D11

D10

Bit

Function

I2C Address Bits

(Note 1)

Ref.

Select

(Note 2)

Power-Down

Select

Gain

Select

(Note 3)

CH. A

000

CH. B

000

CH. C

000

CH. D

000

Note 1: Device I2C address bits. The user can also specify these bits during the device ordering process. The

factory default setting is “000”. These bits can be reprogrammed by the user using the I2C Address Write

command.

Voltage Reference Select:

0 = External V

REF (VDD), 1 = Internal VREF (2.048V).

Gain Select:

0 = Gain of 1, 1 = Gain of 2.

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