Rainbow-electronics MAX5821 Manuale Utente Pagina 11
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Chip Information
TRANSISTOR COUNT: 11,186
PROCESS: BiCMOS
MAX5822
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
______________________________________________________________________________________ 11
SERIAL DATA INPUT
C3 C2 C1 C0 D11 D10 D9 D8
FUNCTION
0000
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Load DAC A input and DAC registers with new data.
Contents of DAC B input registers are transferred to the
DAC register. Both outputs are updated.
0001
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Load DAC B input and DAC registers with new data.
Contents of DAC A input registers are transferred to the
DAC register. Both outputs are updated simultaneously.
0100
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Load DAC A input register with new data. DAC outputs
remain unchanged.
0101
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Load DAC B input register with new data. DAC outputs
remain unchanged.
1000
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Data in all input registers is transferred to respective DAC
registers. All DAC outputs are updated simultaneously.
New data is loaded into DAC A input register.
1001
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Data in all input registers is transferred to respective DAC
registers. All DAC outputs are updated simultaneously.
New data is loaded into DAC B input register.
1100
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Load all DACs with new data and update all DAC outputs
simultaneously. Both input and DAC registers are updated
with new data.
1101
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
Load all input registers with new data. DAC outputs
remain unchanged.
1110 XXXX
Update all DAC outputs simultaneously. Device ignores
D11–D8. Do not send the data byte.
1111 0000
Extended command mode. The next word writes to the
power-down registers (Extended Command Mode).
1111 0001
Read DAC A data. The device expects an S
r
condition
followed by an address word with R/W = 1.
1111 0010
Read DAC B data. The device expects an S
r
condition
followed by an address word with R/W = 1.
Table 3. Command Byte Definitions
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