Rainbow Electronics MAX550A - Manual (Page 10)

MAX548A/MAX549A/MAX550A
+2.5V to +5.5V, Low-Power, Single/Dual,
8-Bit Voltage-Output DACs in µMAX Package
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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