MCP4728 Microchip Technology Inc., MCP4728 Datasheet - Page 40

• Manufacturer Part Number: MCP4728
• Description: 12-bit, Quad Digital-to-analog Converter With Eeprom Memory
• Manufacturer: Microchip Technology Inc.

MCP4728
FIGURE 5-9:
from Starting Channel to 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.
DS22187A-page 40
Command Type Bits:
Start
S
(C2 C1 C0 W1 W2)
0
Sequential Write
1
Command
1
1
Device Addressing
0
0
1
Note 1:
1st byte
0
0 DAC1 DAC0 UDAC A V
A2 A1 A0
2:
Sequential Write
Sequential Write Command: Write DAC Input Registers and EEPROM Sequentially
Channel Select
The MCP4728 device starts writing EEPROM at the falling edge of the 4th byte’s ACK
pulse.
V
If UDAC = 0 or LDAC Pin = 0: V
EEPROM Write:
C2=0
2nd Byte
OUT
ACK (MCP4728)
Update:
R/W
0
C1=1
A
V
Repeat Bytes of the 3rd - 4th Bytes
REF
C0=0
REF
PD1 PD0 Gx D11 D10 D9 D8 A D7 D6 D5 D4 D3 D2 D1 D0 A
PD1 PD0 Gx D11 D10 D9 D8 A D7 D6 D5 D4 D3 D2 D1 D0 A
W1=1
OUT
3rd Byte
3rd Byte
DAC Input Register of Selected Channel
DAC Input Register of Channel D
is updated after the 4th byte’s ACK is issued.
W0=0
ACK (MCP4728)
ACK (MCP4728)
© 2009 Microchip Technology Inc.
4th Byte
4th Byte
Notes 1 and 2
Note 1
Stop
P