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3235

Allegro MicroSystems
Part Number 3235
Manufacturer Allegro MicroSystems
Description DUAL-OUTPUT HALL-EFFECT SWITCH
Published Mar 30, 2005
Detailed Description 3235 DUAL-OUTPUT HALL-EFFECT SWITCH 3235 DUAL-OUTPUT HALL-EFFECT SWITCH Type UGN3235K Hall-effect sensors are bipolar i...
Datasheet PDF File 3235 PDF File

3235
3235

Overview
3235 DUAL-OUTPUT HALL-EFFECT SWITCH 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 responds 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 shows a zone in the region of 0 G, tH, where both outputs are in the 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).
Data Sheet 27633A* V CC X 1 2 3 4 OUTPUT1 OUTPUT2 Dwg.
PH-007 Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS at TA = +25°C Power Supply, VCC .
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