Allegro UGN3275K Datasheet

V

CC

1

X

SUPPLY

OUTPUT

32

OUTPUT

Dwg. PH-002

4

GROUND

Data Sheet

27632.2

3275

COMPLEMENTAR Y-OUTPUT

HALL-EFFECT LATCH

Type UGN3275K latching Hall-effect sensors are bipolar inte­grated circuits designed for electronic commutation of brushless dc
motors. They feature dual complementary outputs. The latches are
typically used to sense matched magnetic flux densities of alternating
polarity from multipole ring magnets.

Each sensor IC includes a Hall voltage generator, operational
amplifier, Schmitt trigger, voltage regulator, and dual bipolar output
transistors. The regulator allows use of the integrated circuit with
supply voltages of 4.5 V to 24 V.

If the Hall cell is exposed to a magnetic flux density greater than
the operate threshold (BOP), OUTPUT goes low (turns on) and
OUTPUT goes high (turns off). The outputs will hold (latch) this state
until magnetic field reversal exposes the Hall cell to a magnetic flux
density below the release threshold (BRP) when OUTPUT will go high
(off) and OUTPUT will go low (on). This state is also latched. Under
any condition one output is on while the other is off. Because the
operating state switches only with magnetic field reversal, and not
merely with a change in the strength, these integrated circuits qualify
as true Hall-effect latches.

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

Power Supply, VCC. . . . . . . . . . . . . . . . 25 V

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

Output OFF Voltage, V
Output ON Current, I
Operating Temperature Range,

TA . . . . . . . . . . . . . . . . . -20°C to +85°C

Storage Temperature Range,

TS . . . . . . . . . . . . . . . . -65°C to +150°C

. . . . . . . . . . 25 V

OUT

. . . . . . . . . . 50 mA

OUT

These complementary-output Hall-effect latches are supplied in a
four-pin plastic SIP, 0.200" (5.08 mm) wide, 0.130" (3.3 mm) high, and

0.060" (1.54 mm) thick.

FEATURES

■ Operable with Multipole Ring Magnets

■ High Reliability

■ Small Size

■ Output Compatible with All Digital Logic Families

■ 4.5 V to 24 V Operation

■ High Hysteresis Level Minimizes Stray-Field Problems

■ Complementary Outputs

Always order by complete part number: UGN3275K .

3275

COMPLEMENTARY-OUTPUT
HALL-EFFECT LATCH

SENSOR LOCATION

ACTIVE AREA DEPTH

0.015"

0.38 mm
NOM

0.096"

2.44 mm

0.047"

1.21 mm

A

1

REG.

FUNCTIONAL BLOCK DIAGRAM

V

CC

X

2

OUTPUT

3

OUTPUT

BRANDED
SURFACE

1 432

Dwg. MH-001-2A

ELECTRICAL CHARACTERISTICS at T

= +25°C, V

A

= 4.5 V to 24 V

CC

4

GROUND

Dwg. FH-002

(unless otherwise noted).

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V
Output Saturation Voltage V

OUT(SAT)

Output Leakage Current I
Supply Current l
Output Rise Time t
Output Fall Time t

CC

OFF

CC

r

f

Operating 4.5 — 24 V
VCC = 4.5 V, I
V

= 24 V, VCC = 24 V, B < B

OUT

VCC = 24 V, B < B

= 20 mA, B > B

OUT

RP

RP

OP

— — 400 mV
——10µA

— — 7.0 mA
VCC = 12 V, RL = 820 Ω, CL = 20 pF — 0.04 0.4 µs
VCC = 12 V, RL = 820 Ω, CL = 20 pF — 0.18 0.4 µs

MAGNETIC CHARACTERISTICS

TA = +25°CT

= -20°C to +85°C

A

Characteristic Symbol Min. Max. Min. Max. Units

Operate Point B
Release Point B
Hysteresis B

OP

RP

hys

25 250 15 250 G

-250 -25 -250 -15 G
100 — 100 — G

NOTE: As used here, negative flux densities are defined as less than zero (algebraic convention).

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1991, 2000 Allegro MicroSystems, Inc.