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ADG728 Arkusz danych(PDF) 10 Page - Analog Devices

Numer części ADG728
Szczegółowy opis  CMOS, Low-Voltage, 2-Wire Serially-Controlled, Matrix Switches
Download  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

ADG728 Arkusz danych(HTML) 10 Page - Analog Devices

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–10–
REV. 0
ADG728/ADG729
WRITE OPERATION
When writing to the ADG728/ADG729, the user must begin
with an address byte and R/
W bit, after which the switch will
acknowledge that it is prepared to receive data by pulling SDA
low. This address byte is followed by the 8-bit word. The write
operations for each matrix switch are shown in the figures below.
SCL
SDA
S8
S7
S6
S5
S4
S3
S2
S1
00
1
1
A0
R/
W
STOP
COND
BY
MASTER
ACK
BY
ADG728
START
COND
BY
MASTER
ADDRESS BYTE
DATA BYTE
ACK
BY
ADG728
A1
1
Figure 16. ADG728 Write Sequence
SCL
SDA
S8
S7
S6
S5
S4
S3
S2
S1
00
1
A0
R/
W
STOP
COND
BY
MASTER
ACK
BY
ADG729
START
COND
BY
MASTER
ADDRESS BYTE
DATA BYTE
ACK
BY
ADG729
A1
1
0
Figure 17. ADG729 Write Sequence
READ OPERATION
When reading data back from the ADG728/ADG729, the user
must begin with an address byte and R/
W bit, after which the
matrix switch will acknowledge that it is prepared to transmit data
by pulling SDA low. The readback operation is a single byte
that consists of the eight data bits in the input register. The read
operations for each part are shown in Figures 18 and 19.
SCL
SDA
S8
S7
S6
S5
S4
S3
S2
S1
00
1
A0
R/
W
STOP
COND
BY
MASTER
ACK
BY
ADG728
START
COND
BY
MASTER
ADDRESS BYTE
DATA BYTE
NO ACK
BY
MASTER
A1
1
1
Figure 18. ADG728 Readback Sequence
SCL
SDA
S8
S7
S6
S5
S4
S3
S2
S1
00
1
A0
R/
W
STOP
COND
BY
MASTER
ACK
BY
ADG729
START
COND
BY
MASTER
ADDRESS BYTE
DATA BYTE
NO ACK
BY
MASTER
A1
1
0
Figure 19. ADG729 Readback Sequence


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