US5781
Unipolar Hall Switch – Mediu Sensitivity
um
Features and Benefits
Wide operating voltage range fr
rom 3.5V to
24V
Medium sensitivity
CMOS technology
Chopper-stabilized amplifier stage
tage
Low current consumption
Open drain output
Thin SOT23 3L and flat TO-92 3L
both RoHS Compliant
packages
Application Exam
mples
Automotive, Consu
umer and Industrial
Solid-state switch
Interrupter
Current detector
Proximity detection
on
Ordering Code
Product Code
US5781
US5781
US5781
US5781
US5781
Temperature Code
E
L
E
L
L
Package Code
SE
SE
UA
UA
UA
Option Code
AAA-000
AAA-000
AAA-000
AAA-000
AAA-000
Packing Form Code
RE
RE
BU
BU
CA
Legend:
Temperature Code:
Package Code:
Packing Form:
Ordering example:
L for Temperature Range -40° to 150°C
C
E for Temperature Range -40° to 85°
C
C
SE for TSOT, UA for TO-92(Flat)
or
TO
BU for Bulk, CA for Ammopack
US5781ESE-AAA-000-RE
US5781ESE
1 Functional Diagram
2 General Descriptio
ion
The Melexis US5781 is a unipolar Hall-effect
switch designed in mixed signal CMOS
ed
technology.
The device integrates a vol
ltage regulator, Hall
sensor with dynamic offset c
cancellation system,
Schmitt trigger and an open-d
drain output driver, all
in a single package.
Thanks to its wide operating voltage range and
ng
extended choice of temper
rature range, it is
suitable for use in automot
otive and solid state
switch applications.
The device is delivered in a Thin Small Outline
Transistor (TSOT) for surface mount process and
e
in a Plastic Single In Line (TO
O-92 flat) for through-
hole mount.
Both 3-lead packages are RoHS compliant.
3901005781
Rev 014
Page 1 of 11
Data Sheet
Mar/12
US5781
Unipolar Hall Switch – Medium Sensitivity
Table of Contents
1 Functional Diagram ........................................................................................................ 1
2 General Description ........................................................................................................ 1
3 Glossary of Terms .......................................................................................................... 3
4 Absolute Maximum Ratings ........................................................................................... 3
5 Pin Definitions and Descriptions ................................................................................... 3
6 General Electrical Specifications .................................................................................. 4
7 Magnetic Specifications ................................................................................................. 4
8 Output Behaviour versus Magnetic Pole ...................................................................... 4
9 Detailed General Description ......................................................................................... 5
10 Unique Features ............................................................................................................ 5
11 Performance Graphs .................................................................................................... 6
11.1 Typical Magnetic Switch Points vs V
DD
....................................................................................................6
11.2 Magnetic Switch Points vs Temperature .................................................................................................6
11.3 Typical Saturation Voltage vsTemperature (V
DD
=12V;Iout=20mA) .........................................................6
12 Application Information................................................................................................ 7
12.1 Typical Three-Wire Application Circuit ....................................................................................................7
12.2 Two-Wire Circuit ......................................................................................................................................7
12.3 Automotive and Harsh, Noisy Environments Three-Wire Circuit ............................................................7
13 Application Comments ................................................................................................. 7
14 Standard information regarding manufacturability of Melexis products with
different soldering processes........................................................................................... 8
15 ESD Precautions ........................................................................................................... 8
16 Package Information..................................................................................................... 9
16.1 SE Package (TSOT-3L)...........................................................................................................................9
16.2 UA Package (TO-92 flat) .......................................................................................................................10
17 Disclaimer.................................................................................................................... 11
3901005781
Rev 014
Page 2 of 11
Data Sheet
Mar/12
US5781
Unipolar Hall Switch – Medium Sensitivity
3 Glossary of Terms
MilliTesla (mT), Gauss
RoHS
TSOT
ESD
BLDC
Units of magnetic flux density:
1mT = 10 Gauss
Restriction of Hazardous Substances
Thin Small Outline Transistor (TSOT package) – also referred with the Melexis
package code “SE”
Electro-Static Discharge
Brush-Less Direct-Current
4 Absolute Maximum Ratings
Parameter
Symbol
Supply Voltage
V
DD
Supply Current
I
DD
Output Voltage
V
OUT
Output Current
I
OUT
Storage Temperature Range
T
S
Maximum Junction Temperature
T
J
Table 1: Absolute maximum ratings
Value
28
50
28
50
-50 to 150
165
Units
V
mA
V
mA
°C
°C
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-
rated conditions for extended periods may affect device reliability.
Operating Temperature Range
Temperature Suffix “E”
Temperature Suffix “L”
Symbol
T
A
T
A
Value
-40 to 85
-40 to 150
Units
°C
°C
5 Pin Definitions and Descriptions
SE Pin
№
UA Pin
№
Name
1
1
VDD
2
3
OUT
3
2
GND
Table 2: Pin definitions and descriptions
Type
Supply
Output
Ground
Function
Supply Voltage pin
Open Drain Output pin
Ground pin
SE package
UA package
3901005781
Rev 014
Page 3 of 11
Data Sheet
Mar/12
US5781
Unipolar Hall Switch – Medium Sensitivity
6 General Electrical Specifications
DC Operating Parameters T
A
= 25
o
C, V
DD
Parameter
Symbol
Supply Voltage
V
DD
Supply Current
I
DD
Output Saturation Voltage
V
DSon
Output Leakage Current
I
OFF
Output Rise Time
t
r
Output Fall Time
t
f
Maximum Switching Frequency
F
SW
SE Package Thermal Resistance
R
TH
UA Package Thermal Resistance
R
TH
Table 3: Electrical specifications
= 12V (unless otherwise specified)
Test Conditions
Min
Operating
3.5
B < B
RP
0.5
I
OUT
= 20mA, B > B
OP
B < B
RP,
V
OUT
= 24V
R
L
= 1k , C
L
= 20pF
R
L
= 1k , C
L
= 20pF
Single layer (1S) Jedec board
Typ
2.5
0.3
0.01
0.25
0.25
10
301
200
Max
24
5
0.5
10
Units
V
mA
V
µA
µs
µs
KHz
°C/W
°C/W
7 Magnetic Specifications
DC Operating Parameters T
A
= 25
o
C, V
DD
= 12V (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Operating Point
B
OP
7
12
Release Point
B
RP
3.5
7.5
Hysteresis
B
HYST
2
5
Table 4: Magnetic specifications
Max
15
10
7
Units
mT
mT
mT
8 Output Behaviour versus Magnetic Pole
DC Operating Parameters T
A
= -40
o
C to 150
o
C, V
DD
= 3.5V to 24V (unless otherwise specified)
Parameter
Test Conditions (SE) OUT (SE) OUT (UA)
South pole
B > B
OP
High
Low
Null or weak magnetic field
B -7 0 or B < B
RP
High
High
North pole
B > B
OP
Low
High
Table 5: Output behaviour versus magnetic pole
North pole
South pole
OUT = low (V
DSon
)
UA package
OUT = low (V
DSon
)
SE package
3901005781
Rev 014
Page 4 of 11
Data Sheet
Mar/12
US5781
Unipolar Hall Switch – Mediu Sensitivity
um
9 Detailed General Descri
ription
Based on mixed signal CMOS technology, Melexis US5781 is a Hall-effect device with med
edium magnetic
sensitivity. Its sensitivity enables high accuracy in position sensing by the use of small air g
gap.
The chopper-stabilized amplifier uses switched capacitor technique to suppress the offset generally observed
with Hall sensors and amplifiers. The CM
CMOS technology makes this advanced technique po
possible and
contributes to smaller chip size and lo
ower current consumption than bipolar technology. The small chip size is
he
also an important factor to minimize th effect of physical stress.
he
This combination results in more stabl magnetic characteristics and enables faster and m
le
more precise design.
The wide operating voltage from 3.5V to 24V, “L” and “E” operating temperature range and low current
d
consumption make this device especia suitable for automotive and solid state switch app
ally
plications.
The output signal is open-drain type. S
Such output allows simple connectivity with TTL or CM
CMOS logic by using
a pull-up resistor tied between a pull-u voltage and the device output.
up
10 Unique Features
The US5781 exhibits unipolar magnet switching characteristics. Therefore, it operates on with one
agnetic
nly
magnetic pole.
The UA package is south pole active:
Applying a south magnetic pole greater than B
OP
facing the
branded side of the package switches the outp low.
put
The SE package is north pole active:
Applying a north magnetic pole greater than B
OP
facing the
branded side of the package switches the outp low.
put
Removing the magnetic field (B→0) switches the output high.
The use of the opposite magnetic pole facing the branded side
does not affect the output state.
Unipolar switch characteristic
A magnetic hysteresis B
HYST
keeps B
OP
and B
RP
separated by a minimal value. This hyster
resis prevents
output oscillation near the switching point.
po
3901005781
Rev 014
Page 5 of 11
Data Sheet
Mar/12
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