Ds1805 addressable digital potentiometer – Rainbow Electronics DS1805 User Manual
Page 10
DS1805
Addressable Digital Potentiometer
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Figure 5. 2-Wire Write Protocols
Figure 6. Timing Diagram
ACK
STOP
MSB
OPTIONAL
DATA
BYTE
LSB
POT-1
MSB
ST
AR
T
ACK
ACK
ACK
STOP
CONTROL
BYTE
LSB
MSB
COMMAND
BYTE
LSB
MSB
DATA
BYTE
LSB
POT-1
R/W = 0
MSB
REGISTER-0
WRITE POT-1
WRITE REGISTER-0 AND POT-1 (SAME VALUE)
ST
AR
T
ACK
ACK
ACK
CONTROL
BYTE
LSB
MSB
COMMAND
BYTE
LSB
MSB
DATA
BYTE
LSB
REG-0
R/W = 0
0
1
0
1
A2
A1
A0
0
0
1
0
1
A2
A1
A0
0
0
1
0
1
A2
A1
A0
0
1
0
1
0
1
0
0
1
1
0
1
0
1
0
1
0
MSB
ST
AR
T
ACK
ACK
ACK
STOP
CONTROL
BYTE
LSB
MSB
COMMAND
BYTE
LSB
MSB
DATA
BYTE
LSB
REG-0/POT-1 VALUE
R/W = 0
1
0
1
0
1
1
1
1
SDA
SCL
t
HD:STA
t
LOW
t
HIGH
t
R
t
F
t
BUF
t
HD:DAT
t
SU:DAT
REPEATED
START
t
SU:STA
t
HD:STA
t
SU:STO
t
SP
STOP
START