參數(shù)資料
型號(hào)： DAC757IDGSR
廠商： Texas Instruments, Inc.
英文描述： QUAD, 12-BIT, LOW-POWER, VOLTAGE OUTPUT, I2C INTERFACE DIGITAL-TO-ANALOG CONVERTER
中文描述： 四，12位，低功耗，電壓輸出，I2C接口的數(shù)字模擬轉(zhuǎn)換器
文件頁(yè)數(shù)： 19/31頁(yè)
文件大小： 783K
代理商： DAC757IDGSR
www.ti.com
DAC7574
SLAS375–JUNE 2003
Master Transmitter Writing to a Slave Receiver (DAC7574) in Standard/Fast Modes
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 DAC7574 and determines which channel of DAC7574 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 DAC7574 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
2
C-Bus is
recognized (refer to the DATA INPUT MODE section of Table 4).
With (PD0-Bit = 1) the DAC7574 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
)
DAC7574
DAC7574 Acknowledges
Master
0
0
Load 1
Load 0
x
Buff Sel 1
Buff Sel 0
PD0
Control byte (
PD0=0
)
DAC7574
DAC7574 Acknowledges
Master
D11
D10
D9
D8
D7
D6
D5
D4
Writing data word, high byte
DAC7574
DAC7574 Acknowledges
Master
D3
D2
D1
D0
x
x
x
x
Writing data word, low byte
DAC7574
DAC7574 Acknowledges
Data or Stop or Repeated Start(1)
Master
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
)
DAC7574
DAC7574 Acknowledges
Master
0
0
Load 1
Load 0
x
Buff Sel 1
Buff Sel 0
PD0
Control byte (
PD0 = 1
)
DAC7574
DAC7574 Acknowledges
Master
PD1
PD2
0
0
0
0
0
0
Writing data word, high byte
DAC7574
DAC7574 Acknowledges
Master
0
0
0
0
x
x
x
x
Writing data word, low byte
DAC7574
DAC7574 Acknowledges
Stop or Repeated Start(1)
Master
Done
(1)
(2)
Use repeated START to secure bus operation and loop back to the stage of write addressing for next Write.
Once DAC7574 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.
19
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