2

FN6590.0

November 27, 2007

Block Diagrams

Pin Descriptions

µTQFN

PIN

SYMBOL

BRIEF DESCRIPTION

1PU

The PU is a negative-edge triggered input with internal pull-up. Toggling PU will move the wiper close to RH terminal.

2PD

The PD is a negative-edge triggered input with internal pull-up. Toggling PD will move the wiper close to RL terminal.

3

RH

The RH and RL pins of the ISL23512 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum

voltage is VSS and the maximum is VCC. The terminology of RH and RL references the relative position of the terminal in

relation to wiper movement direction selected by the PU/PD input.

Ground

5

RW

The RW pin is the wiper terminal of the potentiometer which is equivalent to the movable terminal of a mechanical

potentiometer.

6

RL

The RH and RL pins of the ISL23512 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum

voltage is VSS and the maximum is VCC. The terminology of RH and RL references the relative position of the terminal in

relation to wiper movement direction selected by the PU/PD input.

7, 9, 10

NC

No connection.

Supply Voltage.

4-BIT

UP/DOWN

COUNTER

ONE

OF

DECODER

RESISTOR

ARRAY

RH

PU

PD

TRANSFER

GATES

SIXTEEN

RL

CONTROL

BLOCK

PU

PD

RH

GENERAL

DETAILED

0

1

2

12

13

14

15

RL

RW

RW

ISL23512