DP7409 datasheet(2/16 Pages) COPAL

2 / 16 page

DP7409

Doc. No. MD-2010 Rev. K

NIDEC COPAL ELECTRONICS CORP.

Characteristics subject to change without notice

PIN DESCRIPTIONS

SCL: Serial Clock

The DP7409 serial clock input pin is used to clock all

data transfers into or out of the device.

SDA: Serial Data

The DP7409 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 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 DP7409.

RH, RL: Resistor End Points

The four sets of RH and RL pins are equivalent to the

terminal connections on a mechanical potentiometer.

RW: Wiper

The four 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 Write Protection

on page 7 for more details.

DEVICE OPERATION

The DP7409 is four resistor arrays integrated with 2-wire 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 allows 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#

(TSSOP)

Pin#

(SOIC)

Name

Function

VCC

Supply Voltage

RL0

Low Reference Terminal

for Potentiometer 0

RH0

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

410

RH1

High Reference Terminal

for Potentiometer 1

511

RW1

Wiper Terminal for

Potentiometer 1

GND

Ground

713

No Connect

814

RW2

Wiper Terminal for

Potentiometer 2

915

RH2

High Reference Terminal

for Potentiometer 2

RL2

Low Reference Terminal

for Potentiometer 2

SCL

Bus Serial Clock

Device Address

No Connect

Device Address, LSB

RW3

Wiper Terminal for

Potentiometer 3

RH3

High Reference Terminal

for Potentiometer 3

RL3

Low Reference Terminal

for Potentiometer 3

No Connect

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