DP7269 datasheet(2/16 Pages) COPAL

2 / 16 page

DP7269

Doc. No. MD-2123 Rev. D

NIDEC COPAL ELECTRONICS CORP.

Characteristics subject to change without notice

PIN DESCRIPTIONS

PIN DESCRIPTION

SCL: Serial Clock

The DP7269 serial clock input pin is used to

clock all data transfers into or out of the

device.

SDA: Serial Data

The DP7269 bidirectional serial data pin is

used to transfer data into and out of the

device. The SDA pin is an open drain output

and can be wire-Ored with the other open

drain or open collector I/Os.

A0, A1, A2, A3: Device Address Inputs

These inputs set the device address when

addressing multiple devices. A total of sixteen

devices can be addressed on a single bus. A

match in the slave address must be made with

the

address

input

order

initiate

communication with the DP7269.

RH, RL: Resistor End Points

The two sets of RH and RL pins are equivalent

to the terminal connections on a mechanical

potentiometer.

RW: Wiper

The RW pins are equivalent to the wiper

terminal of a mechanical potentiometer.

¯¯¯: Write Protect Input

The WP

¯¯¯ pin when tied low prevents non-

volatile writes to the data register (change of

wiper control register is allowed) and when

tied high or left floating normal read/write

operations are allowed. See Write Protection

on page 7 for more details.

DEVICE OPERATION

The DP7269 is two resistor arrays integrated with a 2-wire serial interface, two 8-bit wiper control registers and

eight 8-bit, non-volatile memory data registers. Each resistor array contains 255 separate resistive elements

connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical

potentiometer (RH and RL). The tap positions between and at the ends of the series resistors are connected to the

output wiper terminals (RW) by a CMOS transistor switch. Only one tap point for each potentiometer is connected

to its wiper terminal at a time and is determined by the value of the wiper control register. Data can be read or

written to the wiper control registers or the non-volatile memory data registers via the 2-wire bus. Additional

instructions allow data to be transferred between the wiper control registers and each respective potentiometer's

non-volatile data registers. Also, the device can be instructed to operate in an "increment/decrement" mode.

Pin #

Name

Function

No Connect

Device Address, LSB

No Connect

7VCC

Supply Voltage

8RL0

Low Reference Terminal for Potentiometer 0

9RH0

High Reference Terminal for Potentiometer 0

RW0

Wiper Terminal for Potentiometer 0

Device Address

¯¯¯

Write Protection

SDA

Serial Data Input/Output

Device Address

RL1

Low Reference Terminal for Potentiometer 1

RH1

High Reference Terminal for Potentiometer 1

RW1

Wiper Terminal for Potentiometer 1

GND

Ground

No Connect

SCL

Bus Serial Clock

Device Address

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