DP7419 datasheet(2/16 Pages) COPAL

2 / 16 page

DP7419

Doc. No. MD-2115 Rev. H

Characteristics subject to change without notice

PIN DESCRIPTIONS

SCL: Serial Clock

The DP7419 serial clock input pin is used to

clock all data transfers into or out of the device.

SDA: Serial Data

The DP7419 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-

OR'd with the other open drain or open collector

outputs.

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 in order to initiate communication

with the DP7419.

RH, RL: Resistor End Points

The 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 registers (change of wiper

control register is allowed) and when tied high or

left floating normal read/write operations are

allowed. See page 7, Write Protection for more

details.

DEVICE OPERATION

The DP7419 is two resistor arrays integrated with 2wire serial interface logic, four 6-bit wiper control registers

and sixteen 6-bit, non-volatile memory data registers. Each resistor array contains 63 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). RH and RL are symmetrical and may be interchanged. 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.

SOIC

TSSOP

Name

Function

119

VCC

Supply Voltage

220

RL0

Low Reference Terminal for

Potentiometer 0

321

RH0

High Reference Terminal for

Potentiometer 0

422

RW0

Wiper Terminal for

Potentiometer 0

Device Address

624

¯¯¯

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

No Connect

Device Address, LSB

No Connect

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