Rainbow Electronics MAX550A User Manual
Page 10
MAX548A/MAX549A/MAX550A
+2.5V to +5.5V, Low-Power, Single/Dual,
8-Bit Voltage-Output DACs in µMAX Package
10
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Table 2. MAX548A Serial-Interface Programming Commands (continued)
COMMANDS FOR POWERING DOWN
X
1
X
0
X
1
0
CONTROL BYTE
8-Bit DAC Data
X
Load DAC B input register and power down DAC
B. DAC A registers unchanged.
X
X
1
X
0
X
1
1
8-Bit DAC Data
X
Load both DAC input registers and power down
both DACs. Both DAC registers unchanged
X
X
1
X
1
0
1
0
8-Bit DAC Data
X
Load DAC B input register, power down DAC B,
and update both DAC registers. DAC A input
register unchanged.
X
X = Don’t care
X
1
X
1
0
0
1
8-Bit DAC Data
X
Load DAC A input register, power down DAC A,
and update both DAC registers. DAC B input
register unchanged.
X
X
1
X
0
X
0
1
8-Bit DAC Data
X
Load DAC A input register and power down DAC
A. DAC B registers unchanged.
X
X
1
X
1
0
1
1
8-Bit DAC Data
X
Load both DAC input registers, power down both
DACs, and update both DAC registers.
X
X
1
X
1
1
0
1
8-Bit DAC Data
0
Load DAC A input register, power down
DAC A, and update both DAC registers. DAC B
input register unchanged.
X
X
1
X
1
1
1
0
8-Bit DAC Data
0
Load DAC B input register, power down
DAC B, and update both DAC registers. DAC A
input register unchanged.
X
X
1
X
1
1
1
1
8-Bit DAC Data
0
Load both DAC input registers and power down
both DACs. Update both DAC registers.
X
X
1
X
1
1
0
1
8-Bit DAC Data
1
Load DAC A input register and power down DAC
A. While powered down, on LDAC’s falling edge,
update both DAC registers. DAC B input register
unchanged.
X
X
1
X
1
1
1
0
8-Bit DAC Data
1
Load DAC B input register and power down DAC
B. While powered down, on LDAC’s falling edge,
update both DAC registers. DAC A input register
unchanged.
X
X
1
X
1
1
1
1
8-Bit DAC Data
1
Load both DAC input registers and power down
both DACs. While powered down, on LDAC’s
falling edge, update both DAC registers.
X
COMMAND
(Commands executed on
CS
’s rising edge)
LDAC
DATA BYTE
Loaded Last
Loaded First
Pin 6
D7........D0
UB1
A0
A1
C0
C1
C2
UB3
UB2
COMMANDS POWERING DOWN AND LOADING INPUT REGISTER(S) ONLY
COMMANDS POWERING DOWN AND UPDATING DAC REGISTER(S)
COMMANDS POWERING DOWN AND UTILIZING THE ASYNCHRONOUS LOAD FUNCTION