MAX521ACAG 데이터 시트보기 (PDF) - Maxim Integrated
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MAX521ACAG Datasheet PDF : 20 Pages
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Quad/Octal, 2-Wire Serial 8-Bit DACs
with Rail-to-Rail Outputs
0 OR AD2
0 1 0 1 AD1 AD0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 0
SDA
ADDRESS BYTE
START
CONDITION
ACK
COMMAND BYTE
ACK
(ADDRESSING DAC0)
OUTPUT BYTE
ACK
COMMAND BYTE
ACK
(FULL SCALE)
(ADDRESSING DAC1)
( ) DAC0 INPUT LATCH
SET TO FULL SCALE
1 1 1 1 1 1 1 1 00 0 0 0 0 01 00 1 0 0 0 0 0 0 0 0
SDA
OUTPUT BYTE
(FULL SCALE)
ACK
COMMAND BYTE ACK
(ADDRESSING DAC2)
( ) DAC1 INPUT LATCH
SET TO FULL SCALE
OUTPUT BYTE
ACK
(HALF SCALE)
STOP
DAC2 INPUT LATCH CONDITION
( ) SET TO HALF SCALE DAC OUTPUTS CHANGE HERE:
( ) DACS 0 AND 1 GO TO FULL SCALE,
DAC 2 GOES TO HALF SCALE.
Figure 7. Setting DAC Outputs
(a)
SDA
START
CONDITION
01 0 1
0 OR AD2
(PD)
AD1 AD0 0 0 0 0 0 0 1
XX
ADDRESS BYTE
ACK
COMMAND BYTE
0
X
ACK
( ) STOP DEVICE ENTERS
CONDITION POWER-DOWN STATE
0 OR AD2
(b)
(PD)
0 1 0 1 AD1 AD0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 1 1 1 1 1 0
SDA
START
CONDITION
ADDRESS BYTE
NOTE: X = DON'T CARE
ACK
COMMAND BYTE
ACK
(ADDRESSING DAC0)
OUTPUT BYTE
ACK
(FULL SCALE)
STOP
DAC 0 INPUT LATCH CONDITION
( ) SET TO FULL SCALE DEVICE ENTERS POWER-DOWN STATE.
( ) DAC 0 OUTPUT LATCH SET TO FULL SCALE.
Figure 8. Entering the Power-Down State
(a)
SDA
START
CONDITION
01 0 1
0 OR AD2
AD1 AD0 0
ADDRESS BYTE
(PD)
000 0 0 0
XX
ACK
COMMAND BYTE
0
X
ACK
( ) STOP DEVICE RETURNS TO
CONDITION NORMAL OPERATION
(b)
0 OR AD2
(PD)
0 1 0 1 AD1 AD0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0
SDA
START
CONDITION
ADDRESS BYTE
NOTE: X = DON'T CARE
ACK
COMMAND BYTE
ACK
(ADDRESSING DAC3)
OUTPUT BYTE
ACK
(SET TO 0)
STOP
DAC3 OUTPUT CONDITION
( ) LATCH SET TO 0 DEVICE RETURNS TO NORMAL OPERATION.
( ) DAC 3 SET TO 0.
Figure 9. Returning to Normal Operation from Power-Down
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