MAX5392 MAXIM [Maxim Integrated Products], MAX5392 Datasheet - Page 12

• Manufacturer Part Number: MAX5392
• Description: Dual, 256-Tap, Volatile, Low-Voltage, Linear Taper Digital Potentiometer
• Manufacturer: MAXIM [Maxim Integrated Products]

Dual, 256-Tap, Volatile, Low-Voltage,
Linear Taper Digital Potentiometer
The MAX5392 includes a 7-bit slave address (Figure 4).
The 8th bit following the 7th bit of the slave address is the
NOP/W bit. Set the NOP/W bit low for a write command
and high for a no-operation command. The device does
not support readback.
The device provides three address inputs (A0, A1, and
A2), allowing up to eight devices to share a common
bus (Table 1). The first 4 bits (MSBs) of the factory-set
slave addresses are always 0101. A2, A1, and A0 set the
next 3 bits of the slave address. Connect each address
input to V
address to share a common bus.
Write to the devices by transmitting the device’s slave
address with NOP/W (8th bit) set to zero, followed by
at least 2 bytes of information. The first byte of informa-
Figure 6. Acknowledge
Figure 7. Command and Single Data Byte Received
12
_____________________________________________________________________________________
S
SCL
SDA
CONDITION
START
DD
or GND. Each device must have a unique
BYTE MAP INTO DEVICE REGISTERS
SLAVE ADDRESS
HOW CONTROL BYTE AND DATA
ACKNOWLEDGE
Message Format for Writing
1
NOP/W
0
A
Slave Address
D15 D14 D13 D12 D11 D10
2
COMMAND BYTE
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).
Table 1. Slave Addresses
GND
GND
GND
GND
V
V
V
V
A2
D9
DD
DD
DD
DD
ADDRESS INPUTS
D8
A
GND
GND
GND
GND
V
V
V
V
A1
8
D7
DD
DD
DD
DD
NOT ACKNOWLEDGE
D6
D5
1 DATA BYTE
ACKNOWLEDGE
GND
GND
GND
GND
V
V
V
V
A0
ACKNOWLEDGMENT
DD
DD
DD
DD
CLOCK PULSE FOR
D4
ACKNOWLEDGE
D3
9
D2
SLAVE ADDRESS
D1
0101000
0101001
0101010
0101011
0101100
0101101
0101110
0101111
D0
A
P