MAX5811 Maxim, MAX5811 Datasheet - Page 10

• Manufacturer Part Number: MAX5811
• Description: 10-Bit / Low-Power / 2-Wire Interface / Serial / Voltage-Output DAC
• Manufacturer: Maxim

10-Bit Low Power 2-Wire Interface Serial,
Voltage-Output DAC
Table 3. Command Byte Definitions
*When C3 = 0 and C2 = 1, data bits D9 and D8 write to the power-down registers (PD1 and PD0).
X = Don’t care.
Figure 6. Example Write Command Sequences
write cycle must be repeated. Figure 6 shows two
example write data sequences.
10
C3
1
1
1
1
1
0
0
0
0
______________________________________________________________________________________
MSB
MSB
S
S
C2
1
1
1
1
0
1
1
1
1
A6
A6
MSB
C1
D5
A5
A5
X
X
X
X
X
0
0
1
1
SERIAL DATA INPUT
D4
A4
A4
C0
0
1
0
1
X
X
X
X
X
D3
A3
A3
D9/PD1*
D2
A2
A2
DATA
DATA
DATA
EXAMPLE WRITE TO POWER-DOWN REGISTER SEQUENCE
DAC
DAC
DAC
X
X
0
0
1
1
D1
A1
A1
EXAMPLE WRITE DATA SEQUENCE
D8/PD0*
D0
A0
A0
DATA
DATA
DATA
DAC
DAC
DAC
X
X
0
1
0
1
LSB
R/W
LSB
R/W
S1
LSB
S0
ACK
ACK
D7-D6
DATA
DATA
DATA
DAC
DAC
DAC
XX
XX
XX
XX
XX
XX
ACK
MSB
MSB
C3
C3
In read mode (R/W = 1), the MAX5811 writes the con-
tents of the DAC register to the bus. The direction of
Load DAC with new data from the following data byte and
update DAC output simultaneously as soon as data is
available from the serial bus. The DAC and input registers
are updated with the new data.
Load input register with data from the following data byte.
DAC output remains unchanged.
Load input register with data from the following data byte.
Update DAC output to the previously stored data.
Update DAC output from input register. The device
ignores any new data.
Read data request. Data bits are ignored. The contents of
the DAC register are available on the bus.
Power up the device.
Power-down mode 0. Power down device with output
floating.
Power-down mode 1. Power down device with output
terminated with 1kΩ to GND.
Power-down mode 2. Power down device with output
terminated with 100kΩ to GND.
C2
C2
P
C1
X
C0
X
PD1
D9
FUNCTION
PD0
D8
D7
X
LSB
LSB
D6
X
Read Data Format
ACK
ACK
P