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3275 Datasheet

COMPLEMENTARY-OUTPUT HALL-EFFECT LATCH

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3275
V
CC
12 34
Dwg. PH-002
Pinning is shown viewed from branded side.
COMPLEMENTARY-OUTPUT
HALL-EFFECT LATCH
Type UGN3275K latching Hall-effect sensors are bipolar inte-
grated 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.
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.
ABSOLUTE MAXIMUM RATINGS
Power Supply, VCC . . . . . . . . . . . . . . . . 25 V
Magnetic Flux Density, B . . . . . . Unlimited
Output OFF Voltage, VOUT . . . . . . . . . . 25 V
Output ON Current, IOUT . . . . . . . . . . 50 mA
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . . -65°C to +150°C
FEATURES
s Operable with Multipole Ring Magnets
s High Reliability
s Small Size
s Output Compatible with All Digital Logic Families
s 4.5 V to 24 V Operation
s High Hysteresis Level Minimizes Stray-Field Problems
s Complementary Outputs
Always order by complete part number: UGN3275K .




Allegro MicroSystems

3275 Datasheet Preview

3275 Datasheet

COMPLEMENTARY-OUTPUT HALL-EFFECT LATCH

No Preview Available !

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
BRANDED
SURFACE 1
2
3
4
Dwg. MH-001-2A
FUNCTIONAL BLOCK DIAGRAM
1 VCC
REG.
2 OUTPUT
X 3 OUTPUT
4 GROUND
Dwg. FH-002
ELECTRICAL CHARACTERISTICS at TA = +25°C, VCC = 4.5 V to 24 V
(unless otherwise noted).
Characteristic
Supply Voltage
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Fall Time
Symbol
VCC
VOUT(SAT)
IOFF
lCC
tr
tf
MAGNETIC CHARACTERISTICS
Test Conditions
Operating
VCC = 4.5 V, IOUT = 20 mA, B > BOP
VOUT = 24 V, VCC = 24 V, B < BRP
VCC = 24 V, B < BRP
VCC = 12 V, RL = 820 , CL = 20 pF
VCC = 12 V, RL = 820 , CL = 20 pF
Min.
4.5
Typ.
0.04
0.18
Max.
24
400
10
7.0
0.4
0.4
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
BOP
BRP
Bhys
TA = +25°C
Min.
Max.
25 250
-250
-25
100 —
TA = -20°C to +85°C
Min.
Max.
15 250
-250
-15
100 —
NOTE: As used here, negative flux densities are defined as less than zero (algebraic convention).
Units
V
mV
µA
mA
µs
µs
Units
G
G
G
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1991, 2000 Allegro MicroSystems, Inc.


Part Number 3275
Description COMPLEMENTARY-OUTPUT HALL-EFFECT LATCH
Maker Allegro MicroSystems
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