MCP4728 datasheet(40/66 Pages) MICROCHIP

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MCP4728

DS22187C-page 40

FIGURE 5-9:

Sequential Write Command: Write DAC Input Registers and EEPROM Sequentially

from Starting Channel to Channel D. The sequential input register starts with the "Starting Channel" and

ends at Channel D. For example, if DAC1:DAC0 = 00, then it starts with channel A and ends at channel D.

If DAC1:DAC0 = 01, then it starts with channel B and ends at Channel D. Note that this command can

send up to 10 bytes including the device addressing and command bytes. Any byte after the 10th byte is

ignored.

2nd Byte

(C2 C1 C0 W1 W2)

3rd Byte

4th Byte

DAC1 DAC0 UDAC AVREF PD1 PD0 Gx D11 D10 D9 D8 A D7D6D5D4D3D2D1 D0 A

ACK

(MCP4728)

1st byte

DAC Input Register of Starting Channel

R/W

Device Addressing

ACK

(MCP4728)

Start

Sequential Write

1100

A2 A1 A0

Command

Command Type Bits:

C2=0

C1=1

C0=0

W1=1

W0=0

Sequential Write

Starting Channel

VREF PD1 PD0 Gx D11 D10 D9 D8 A D7 D6D5D4D3D2D1D0 A P

ACK

(MCP4728)

DAC Input Register of Channel D

3rd Byte

4th Byte

Repeat Bytes of the 3rd - 4th Bytes

Note 1

Notes 1 and 2

Note 1:

VOUT Update:

If UDAC = 0 or LDAC Pin = 0: V

OUT is updated after the 4th byte’s ACK is issued.

EEPROM Write:

The MCP4728 device starts writing EEPROM at the falling edge of the 4th byte’s ACK

pulse.

Stop

Select

for the Starting Channel + 1, ... until Channel D.

(Last Channel)

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