max5387laud Maxim Integrated Products, Inc., max5387laud Datasheet - Page 11

• Manufacturer Part Number: max5387laud
• Description: Dual, 256-tap, Volatile, Low-voltage Linear Taper Digital Potentiometer
• Manufacturer: Maxim Integrated Products, Inc.

Write to the devices by transmitting the device’s slave
address with NOP/W (eighth bit) set to zero, followed by
at least 2 bytes of information. The first byte of informa-
tion is the command byte. The second byte is the data
byte. The data byte goes into the internal register of the
device as selected by the command byte (Figure 7 and
Table 2).
Use the command byte to select the destination of the
wiper data. See Table 2.
REG A: The data byte writes to register A and the wiper
of potentiometer A moves to the appropriate position.
D[7:0] indicates the position of the wiper. D[7:0] = 00h
Figure 6. Slave Address
Figure 7. Command and Single Data Byte Received
S
SDA
START
SCL
BYTE MAP INTO DEVICE REGISTERS
SLAVE ADDRESS
HOW CONTROL BYTE AND DATA
______________________________________________________________________________________
0
MSB
ACKNOWLEDGE
Message Format for Writing
Dual, 256-Tap, Volatile, Low-Voltage
Command Descriptions
Linear Taper Digital Potentiometer
1
NOP/W
0
A
Command Byte
0
R7
R6
COMMAND BYTE
R5
1
R4
R3
moves the wiper to the position closest to LA. D[7:0] =
FFh moves the wiper to the position closest to HA. D[7:0]
is 80h following power-on.
Table 1. Slave Addresses
R2
A2
GND
GND
GND
GND
V
V
V
V
A2
R1
DD
DD
DD
DD
ADDRESS INPUTS
R0
A1
A
GND
GND
GND
GND
V
V
V
V
A1
DD
DD
DD
DD
D7
D6
LSB
A0
D5
1 DATA BYTE
GND
GND
GND
GND
ACKNOWLEDGE
V
V
V
V
A0
DD
DD
DD
DD
D4
D3
NOP/W
D2
SLAVE ADDRESS
D1
0101000
0101001
0101010
0101011
0101100
0101101
0101110
0101111
ACK
D0
A
P
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