3235

DUAL-OUTPUT

HALL-EFFECT SWITCH

Type UGN3235K Hall-effect sensors are bipolar integrated circuits

designed for commutation of brushless dc motors, and other rotary

encoding applications using multi-pole ring magnets. The device

features two outputs which are independently activated by magnetic

fields of opposite polarity.

Each sensor IC includes a Hall voltage generator, two Schmitt

triggers, a voltage regulator, output transistors, and on-board reverse

polarity protection. The regulator enables these devices to operate

from voltages ranging between 4.5 V and 24 V. On-chip compensation

circuitry stabilizes the switch points over temperature.

Each open-collector output is independently operated by the

proper amount and polarity of incident magnetic flux. Output 1 re-

sponds only to the positive flux from the south pole of a magnet,

Output 2 to the negative flux from the north pole of a magnet. When

the sensor experiences the field of a south magnetic pole greater than

the maximum operate point of Output 1, that output switches to the

LOW state and Output 2 is unaffected. When the incident flux falls

below the minimum release point for Output 1, that output returns to

the HIGH state and Output 2 remains unchanged.

Output 2 independently responds in the same manner to the

negative flux from the north magnetic pole of a magnet. Figure 1

HIGH or OFF state. This constitutes a delay that is independent of

rate of change of the incident magnetic field and ensures that both

outputs are never ON simultaneously. This is an essential feature for

driving brushless dc motors with a minimum of reactive transient

currents.

The UGN3235K is supplied in a four-pin plastic single in-line

package (SIP).

FEATURES

s Reliable and Rugged Magnetic Sensing Switch

s Two Outputs Independently Switched by North and South Poles

s Independent Actuation of Outputs Minimizes Inductive-Load

Reactive Transient

s Built-in Hysteresis Minimizes Interference from Stray Fields

s Operates from 4.5 V to 24 V

s Outputs Compatible with All Logic Levels

s On-Board Reverse Polarity Protection

s Open-Collector, Active-Low Outputs

DUAL-OUTPUT

HALL-EFFECT SWITCH

Always order by complete part number: UGN3235K .

Magnetic Flux Density, B . . . . . . Unlimited

Operating Temperature Range,

Storage Temperature Range

ABSOLUTE MAXIMUM RATINGS

Dwg. PH-007

1

V

CC

4

3

2

Pinning is shown viewed from branded side.

3235