Datasheet

TPL0102

SLIS134B –MARCH 2011– REVISED AUGUST 2011

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PRINCIPLES OF OPERATION

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

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

end-to-end resistance of 100kΩ.

The TPL0102 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

C interface.

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

zeroes, the wiper terminal W is closest to its L (Low) terminal. 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.

Potentiometer Pin Description

HA,HB,LA,LB

The high (HA, HB) and low (LA, LB) terminals of the TPL0102 are equivalent to the fixed terminals of a

mechanical potentiometer. The H and L terminals do not have any polarity restrictions, i.e. H can be at a higher

voltage than L, or L can be at a higher voltage than H. The WA and WB terminals are the wipers and equivalent

to the movable terminal of a mechanical potentiometer. The position of the wiper is set using the WR register.

With the WR register set to 255 decimal, the wiper is closest to the H terminal, and with the WR register set to 0,

the wiper is closest to the L terminal.

SDA, SCL

SDA is a bi-directional serial data input/output pin for I

C communication. SDA is an open drain output and

requires an external pull-up resistor.

SCL is the serial clock input for I

C communication. SCL requires an external pull-up resistor.

A0, A1, A2

These inputs are used to set the last three bits of the I

C address of the device. By using different values for A0,

A1, A2, up to eight TPL0102 devices can be used on the same I

C bus.