MCP4728 datasheet(25/66 Pages) MICROCHIP

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DS22187C-page 25

MCP4728

TABLE 4-3:

CONFIGURATION BITS

Bit Name

Functions

RDY/BSY

This is a status indicator (flag) of EEPROM programming activity:

= EEPROM is not in programming mode

= EEPROM is in programming mode

Note: RDY/BSY status can also be monitored at the RDY/BSY pin.

(A2, A1, A0)

Device I2C address bits. See

Section 5.3 “MCP4728 Device Addressing” for more details.

VREF

Voltage Reference Selection bit:

= V

= Internal voltage reference (2.048V)

Note: Internal voltage reference circuit is turned off if all channels select external reference

(VREF = VDD).

DAC1, DAC0

DAC Channel Selection bits:

= Channel A

= Channel B

= Channel C

= Channel D

PD1, PD0

Power-Down selection bits:

= Normal Mode

= V

OUT is loaded with 1 kΩ resistor to ground. Most of the channel circuits are powered off.

= V

OUT is loaded with 100 kΩ resistor to ground. Most of the channel circuits are powered

off.

= V

OUT is loaded with 500 kΩ resistor to ground. Most of the channel circuits are powered

off.

Note: See Table 4-7 and Figure 4-1 for more details.

Gain selection bit:

= x1 (gain of 1)

= x2 (gain of 2)

Note: Applicable only when internal V

REF is selected. If VREF = VDD, the device uses a gain of

1 regardless of the gain selection bit setting.

UDAC

DAC latch bit. Upload the selected DAC input register to its output register (VOUT):

= Upload. Output (V

OUT) is updated.

= Do not upload.

Note: UDAC bit affects the selected channel only.

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