Datasheet

© 2010 Microchip Technology Inc. DS22187E-page 43
MCP4728
FIGURE 5-12: Write Command: Write Voltage Reference Selection Bit (V
REF
) to the DAC Input
Registers.
FIGURE 5-13: Write Command: Write Power-Down Selection Bits (PD1, PD0) to the DAC Input
Registers. See Table 4-7 for the power-down bit setting.
Note 1: V
REF
= 0: V
DD
= 1: Internal Reference (2.048V)
V
REF
A = Voltage reference of Channel A
V
REF
B = Voltage reference of Channel B
V
REF
C = Voltage reference of Channel C
V
REF
D = Voltage reference of Channel D
2: X is don’t care bit.
Command Type Bits: C2=1 C1=0 C0=0
1st byte
Note 1
2nd Byte
R/W
Device Addressing
ACK (MCP4728)
(C2 C1 C0)
Start
Write
S1100A2A1A00A100XV
REF
AV
REF
BV
REF
CV
REF
D A P
Command
Registers and V
OUT
are updated
at this falling edge of ACK pulse.
Stop
Note 1: X is don’t care bit.
2nd Byte
(C2 C1 C0) 3rd Byte
1 0 1 X PD1 A PD0 A PD1 B PD0 B
A PD1 C PD0 C PD1 D PD0 D X X X X A P
ACK (MCP4728)
1st byte
Channel C
R/W
Device Addressing
ACK (MCP4728)
Start
Write
S1100A2A1A00A
Command
Command Type Bits: C2=1 C1=0 C0=1
Stop
Registers and V
OUT
are updated
at this falling edge of ACK pulse.
Channel A Channel B Channel D
for Power-Down
Selection Bits