MAX5387 データシートの表示（PDF） - Maxim Integrated

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MAX5387

Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer

Maxim Integrated 

Dual, 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometer

SDA

0

1

0

1

A2

A1

A0

NOP/W

ACK

START

MSB

LSB

SCL

Figure 6. Slave Address

ACKNOWLEDGE

HOW CONTROL BYTE AND DATA

BYTE MAP INTO DEVICE REGISTERS

ACKNOWLEDGE

R7 R6 R5 R4 R3 R2 R1 R0

D7 D6 D5 D4 D3 D2 D1 D0

S

0A

A

AP

SLAVE ADDRESS

NOP/W

COMMAND BYTE

1 DATA BYTE

Figure 7. Command and Single Data Byte Received

Message Format for Writing

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).

Command Byte

Use the command byte to select the destination of the

wiper data. See Table 2.

Command Descriptions

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

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

ADDRESS INPUTS

A2

A1

A0

GND

GND

GND

GND

GND

VDD

GND

VDD

GND

GND

VDD

VDD

VDD

GND

GND

VDD

GND

VDD

VDD

VDD

GND

VDD

VDD

VDD

SLAVE ADDRESS

0101000

0101001

0101010

0101011

0101100

0101101

0101110

0101111

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