Microchip Technology MCP4728EV Hoja De Datos
MCP4728
DS22187E-page 38
© 2010 Microchip Technology Inc.
FIGURE 5-7:
Fast Write Command: Write DAC Input Registers Sequentially from Channel A to D.
1st byte
DAC Input Register of Channel A
2nd Byte
R/W
Device Addressing
ACK
(MCP4728)
(C2 C1)
3rd Byte
Update Channel A DAC Input Register at this ACK pulse.
Repeat Bytes
Start
Stop
Fast Write
Note 1: X is a don’t care bit. V
OUT
can be updated after the last byte’s ACK pulse is issued and by bringing down the LDAC
pin to “Low”.
2nd Byte
ACK
(MCP4728)
3rd Byte
Update Channel B DAC Input Register at this ACK pulse.
DAC Input Register of Channel B
S
1
1
0
0
A2 A1 A0
0
A
0
0
PD1 PD0 D11 D10 D9 D8
A
D7 D6 D5 D4 D3 D2 D1 D0
A
Command Type Bits:
C2=0
C1=0
C0=X
Command
X
X PD1 PD0 D11 D10 D9 D8
A
D7 D6 D5 D4 D3 D2 D1 D0
A
2nd Byte
ACK
(MCP4728)
3rd Byte
Update Channel C DAC Input Register at this ACK pulse.
DAC Input Register of Channel C
X
X
PD1 PD0 D11 D10 D9 D8
A
D7 D6 D5 D4 D3 D2 D1 D0
A
2nd Byte
ACK
(MCP4728)
3rd Byte
Update Channel D DAC Input Register at this ACK pulse.
DAC Input Register of Channel D
X
X PD1 PD0 D11 D10 D9 D8
A
D7 D6 D5 D4 D3 D2 D1 D0
A
P