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 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
shows a zone in the region of 0 G, t
H
, 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 T
A
= +25
擄
C
Power Supply, V
CC
. . . . . . . . . . . . . . . .
25 V
Reverse Battery Voltage, V
RCC
. . . . .
-30 V
Magnetic Flux Density, B . . . . . .
Unlimited
Output OFF Voltage, V
OUT
. . . . . . . . . .
25 V
Output ON Current, I
OUT
. . . . . . . . . .
50 mA
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . .
-20
擄
C to + 85
擄
C
Storage Temperature Range
T
S
. . . . . . . . . . . . . . . .
-65
擄
C to +150
擄
C
GROUND
SUPPLY
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
Always order by complete part number:
UGN3235K
.
1
2
3
4
5
6
7
8
