Datasheet
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SLAVE ADDRESS R/W A Ctrl/MS-Byte A LS-Byte A/A P
”0” (write)
Data Transferred
(n* Words + Acknowledge)
Word = 16 Bit
From Master to DAC7571
From DAC7571 to Master
A = Acknowledge (SDA LOW)
A = Not Acknowledge (SDA HIGH)
S = START Condition
Sr = Repeated START Condition
P = STOP Condition
DAC7571 I
2
C-SLAVE ADDRESS:
1 0 0 1 1 0 A0 R/W
MSB LSB
Factory Preset
A0 = I
2
C Address Pin
Standard-and Fast-Mode:
S
HS-Master Code R/W A Ctrl/MS-Byte A LS-Byte A/A P
”0” (write)
Data Transferred
(n* Words + Acknowledge)
Word = 16 Bit
High-Speed-Mode (HS-Mode):
S A Sr Slave Address
HS-Mode Continues
F/S-Mode HS-Mode F/S-Mode
Sr Slave Address
0 0 0 0 1 X X R/W
MSB LSB
HS-Mode Master Code:
0 0 PD1 PD2 D11 D10 D9 D8
MSB LSB
Ctrl/MS-Byte:
D7 D6 D5 D4 D3 D2 D1 D0
MSB LSB
LS-Byte:
D11 − D0 = Data Bits
‘0’ = Write to DAC7571
‘1’ = Not Supported
ADDRESS BYTE
DAC7571
SLAS374C – FEBRUARY 2003 – REVISED MAY 2006
THEORY OF OPERATION (continued)
Figure 45. Master Transmitter Addressing DAC7571 as a Slave Receiver With a 7-Bit Address
MSB R/ W
1 0 0 1 1 0 A0 0
The address byte is the first byte received by the DAC7571 following the START condition from the master
device. The first five bits (MSBs) of the slave address are factory preset to 100110. The next bit of the address
byte is the device select bit, A0. In order for DAC7571 to respond, the logic state of address bit A0 should match
the logic state of address pin A0. A maximum of two devices with the same preset code can therefore be
connected on the same bus at one time. The A0 Address Input can be connected to V
DD
or digital ground, or
can be actively driven by TTL or CMOS logic levels. The device address is set by the state of the A0 pin upon
power-up of the DAC7571. The last bit of the address byte (R/ W) should always be zero (receive only I
2
C
interface). Following the START condition, the DAC7571 monitors the SDA bus, checking the device type
identifier being transmitted. Upon receiving the 100110 code, the appropriate device select bit and the R/ W bit,
the DAC7571 outputs an acknowledge signal on the SDA line. Upon receipt of a broadcast address 10010000,
the DAC7571 responds regardless of the state of the A0 pin.
15
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