I

VOLATILE

REGISTERS

NON-VOLATILE

REGISTERS

A0 A1 A2

HA

LA

HB

LB

WA

WB

VDD

VSS

GND

SDA

SCL

TPL0102-EP

SLIS149 – JUNE 2014

www.ti.com

8 Detailed Description

8.1 Overview

The TPL0102-EP is a two-channel, linear-taper digital potentiometer with 256 wiper positions. Each

potentiometer can be used as a three-pin potentiometer or as a two-pin rheostat. The TPL0102-EP-100 has an

end-to-end resistance of 100 k

Ω.

The TPL0102-EP has non-volatile memory (EEPROM) which can be used to store the wiper position. When the

device is powered down, the last value stored in the IVR register will be maintained in the non-volatile memory.

When power is restored, the contents of the IVR register are recalled and loaded into the corresponding WR

register to set the wipers to the initial position. The internal registers of the TPL0102-EP can be accessed using

The position of the wiper pin is controlled by the value in the WR 8-bit register. When the WR contains all zeroes,

the wiper pin W is closest to its L (low) pin. As the value of the WR increases from all zeroes to all ones (255

decimal), the wiper moves monotonically from the position closest to L to the position closest to H. At the same

time, the resistance between W and L increases monotonically, whereas the resistance between W and H

decreases monotonically.

8.2 Functional Block Diagram

12

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