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DAC5574 Datasheet(PDF) 18 Page - Texas Instruments

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Part No. DAC5574
Description  QUAD, 8-BIT, LOW-POWER, VOLTAGE OUTPUT, I2C INTERFACE DIGITAL TO ANALOG CONVERTER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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DAC5574 Datasheet(HTML) 18 Page - Texas Instruments

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Master Transmitter Writing to a Slave Receiver (DAC5574) in Standard/Fast Modes
DAC5574
SLAS407 – DECEMBER 2003
All write access sequences begin with the device address (with R/W = 0) followed by the control byte. This
control byte specifies the operation mode of DAC5574 and determines which channel of DAC5574 is being
accessed in the subsequent read/write operation. The LSB of the control byte (PD0-Bit) determines if the
following data is power-down data or regular data.
With (PD0-Bit = 0) the DAC5574 expects to receive data in the following sequence HIGH-BYTE –LOW-BYTE –
HIGH-BYTE – LOW-BYTE..., until a STOP Condition or REPEATED START Condition on the I
2C-Bus is
recognized (refer to the DATA INPUT MODE section of Table 4).
With (PD0-Bit = 1) the DAC5574 expects to receive 2 Bytes of power-down data (refer to the POWER DOWN
MODE section of Table 4).
Table 4. Write Sequence in F/S Mode
DATA INPUT MODE
Transmitter
MSB
6
5
4
3
2
1
LSB
Comment
Master
Start
Begin sequence
Master
1
0
0
1
1
A1
A0
R/W
Write addressing (R/W=0)
DAC5574
DAC5574 Acknowledges
Master
0
0
Load 1
Load 0
x
Buff Sel 1
Buff Sel 0
PD0
Control byte (PD0=0)
DAC5574
DAC5574 Acknowledges
Master
D7
D6
D5
D4
D3
D2
D1
D0
Writing data word, high byte
DAC5574
DAC5574 Acknowledges
Master
x
x
x
x
x
x
x
x
Writing data word, low byte
DAC5574
DAC5574 Acknowledges
Master
Data or Stop or Repeated Start(1)
Data or done(2)
POWER DOWN MODE
Transmitter
MSB
6
5
4
3
2
1
LSB
Comment
Master
Start
Begin sequence
Master
1
0
0
1
1
A1
A0
R/W
Write addressing (R/W=0)
DAC5574
DAC5574 Acknowledges
Master
0
0
Load 1
Load 0
x
Buff Sel 1
Buff Sel 0
PD0
Control byte (PD0 = 1)
DAC5574
DAC5574 Acknowledges
Master
PD1
PD2
0
0
0
0
0
0
Writing data word, high byte
DAC5574
DAC5574 Acknowledges
Master
x
x
x
x
x
x
x
x
Writing data word, low byte
DAC5574
DAC5574 Acknowledges
Master
Stop or Repeated Start(1)
Done
(1)
Use repeated START to secure bus operation and loop back to the stage of write addressing for next Write.
(2)
Once DAC5574 is properly addressed and control byte is sent, HIGH–BYTE–LOW–BYTE sequences can repeat until a STOP condition
or repeated START condition is received.
18


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