Rainbow Electronics MAX5842 - Manual (Page 13)

MAX5842
Quad, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
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SERIAL DATA INPUT
C3 C2 C1 C0 D11 D10 D9 D8
FUNCTION
1 1 1 0 X X X X
Update all DAC outputs simultaneously. Device ignores
D11-D8. Do not send the data byte.
1 1 1 1 0 0 0 0
E xtend ed com m and m od e. The next w or d w r i tes to the p ow er -
d ow n r eg i ster s ( E xtend ed C om m and M od e) .
1 1 1 1 0 0 0 1
Read DAC A data. The device expects an S r condition
followed by an address word with R/W = 1.
1 1 1 1 0 0 1 0
Read DAC B data. The device expects an S r condition
followed by an address word with R/W = 1.
1 1 1 1 0 1 0 0
Read DAC C data. The device expects an S r condition
followed by an address word with R/W = 1.
1 1 1 1 1 0 0 0
Read DAC D data. The device expects an S r condition
followed by an address word with R/W = 1.
Table 3. Command Byte Definitions (continued)
S A6 A5 A4 A3 A2 A1 A0 C3 C2 C1 C0 D11 D10 D9 D8
Sr A6 A5 A4 A3 A2 A1 A0
MSB LSB MSB LSB
LSB MSB
ACK ACK
ACK
D7 D6 D5 D4 D3 D2 D1 D0
MSB LSB
ACK
ACK P
R/W
= 1
X X PD1 PD0 D11 D10 D9 D8
MSB LSB
DATA BYTES GENERATED BY MASTER DEVICE
DATA BYTES GENERATED BY MAX5842
ACK GENERATED BY
MASTER DEVICE
R/W
= 0
Figure 8. Example Read Word Data Sequence