MAX549 MAXIM [Maxim Integrated Products], MAX549 Datasheet - Page 11

• Manufacturer Part Number: MAX549
• Description: +2.5V to +5.5V, Low-Power, Single/Dual, 8-Bit Voltage-Output DACs in ?MAX Package
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 3. MAX549A Serial-Interface Programming Commands
X = Don’t care
UB1
UNASSIGNED COMMAND
COMMANDS LOADING INPUT REGISTER(S) ONLY
COMMANDS UPDATING DAC REGISTER(S)
COMMANDS POWERING DOWN AND LOADING INPUT REGISTER(S) ONLY
COMMANDS POWERING DOWN AND UPDATING DAC REGISTER(S)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
8-Bit Voltage-Output DACs in µMAX Package
UB2
X
X
X
X
X
X
X
X
X
X
X
X
X
X
UB3
CONTROL BYTE
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Loaded First
______________________________________________________________________________________
+2.5V to +5.5V, Low-Power, Single/Dual,
C2
X
0
0
0
X
0
0
0
1
1
1
1
1
1
C1
0
0
0
0
1
1
1
1
0
0
0
1
1
1
C0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
A1
0
0
1
1
0
0
1
1
0
1
1
0
1
1
A0
0
1
0
1
0
1
0
1
1
0
1
1
0
1
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
Loaded Last
DATA BYTE
XXXXXXXX
XXXXXXXX
D7........D0
Unassigned command
Load DAC A input register. DAC registers unchanged.
Load DAC B input register. DAC registers unchanged.
Load both DAC input registers. DAC registers
unchanged.
Update both DAC registers with current contents of their
input registers. Both input registers unchanged.
Load DAC A input register and update both DAC
registers. DAC B input register unchanged.
Load DAC B input register and update both DAC
registers. DAC A input register unchanged.
Load both DAC input registers and update both DAC
registers.
Load DAC A input register and power down DAC A.
DAC B input register and both DAC registers unchanged.
Load DAC B input register and power down DAC B.
DAC A input register and both DAC registers unchanged.
Load both DAC input registers and power down both
DACs. Both DAC registers unchanged.
Load DAC A input register, power down DAC A, and
update both DAC registers. DAC B input register
unchanged.
Load DAC B input register, power down DAC B, and
update both DAC registers. DAC A input register
unchanged.
Load both DAC input registers, power down both DACs,
and update both DAC registers.
(Commands executed on CS’s rising edge)
COMMAND
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