US5681
Unipolar Hall Switch – High Sensitivity
Features and Benefits
Wide operating voltage range from 3.5V to 24V
High sensitivity
CMOS technology
Chopper-stabilized amplifier stage
Low current consumption
Open drain output
Thin SOT23 3L RoHS Compliant package
Application Examples
Automotive, Consumer and Industrial
Solid-state switch
Interrupter
Current detector
Proximity detection
Ordering Information
Part No.
US5681ESE-AAA-000-RE
US5681KSE-AAA-000-RE
Temperature Code
E (-40°C to 85°C)
K (-40°C to 125°C)
Package Code
SE (TSOT-3L)
SE (TSOT-3L)
Packing Form
RE (Tape & Reel)
RE (Tape & Reel)
1 Functional Diagram
VDD
OUT
2 General Description
The Melexis US5681 is a unipolar Hall-effect
switch designed in mixed signal CMOS
technology.
The device integrates a voltage regulator, Hall
sensor with advanced Correlated Double
Sampling (CDS) offset cancellation system and an
open-drain output driver, all in a single package.
COMP
Voltage
Regulator
ESD protection
Oscillator and
Bias
ESD protection
DIG
Temperature
compensation
reference
POR
DAMP
DIDO
Hall
Plate
Thanks to its wide operating voltage range and
temperature range, it is suitable for use in
automotive and solid state switch applications.
The device is delivered in a Thin Small Outline
Transistor (TSOT) 3-lead RoHS compliant
package.
GND
3901005681
Rev 003
Page 1 of 11
Data Sheet
March/12
US5681
Unipolar Hall Switch – High 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 ...................................................................... 5
9 Detailed General Description ......................................................................................... 5
10 Unique Features ............................................................................................................ 5
11 Performance Graphs .................................................................................................... 6
12 Test Conditions ............................................................................................................. 7
13 Application Information ................................................................................................ 8
13.1 Typical Three-Wire Application Circuit ...................................................................... 8
13.2 Two-Wire Circuit ....................................................................................................... 8
13.3 Automotive and Harsh, Noisy Environments Three-Wire Circuit ............................... 8
14 Application Comments ................................................................................................. 8
15 Standard information regarding manufacturability of Melexis products with
different soldering processes ........................................................................................... 9
16 ESD Precautions ........................................................................................................... 9
17 SE Package Information (TSOT-3L) ........................................................................... 10
18 Disclaimer .................................................................................................................... 11
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Data Sheet
March/12
US5681
Unipolar Hall Switch – High Sensitivity
3 Glossary of Terms
MilliTesla (mT), Gauss
RoHS
TSOT
ESD
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
4 Absolute Maximum Ratings
Parameter
Symbol
Supply Voltage
V
DD
Supply Current
I
DD
Output Voltage
V
OUT
Output Current
I
OUT
Operating Temperature Range
T
A
Storage Temperature Range
T
S
Maximum Junction Temperature
T
J
Table 1: Absolute maximum ratings
Value
28
50
28
50
-40 to 125
-50 to 150
165
Units
V
mA
V
mA
C
C
C
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-
rated conditions for extended periods may affect device reliability.
5 Pin Definitions and Descriptions
Pin №
Name
Type
1
VDD
Supply
2
OUT
Output
3
GND
Ground
Table 2: Pin definitions and descriptions
Function
Supply Voltage pin
Open Drain Output pin
Ground pin
3901005681
Rev 003
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Data Sheet
March/12
US5681
Unipolar Hall Switch – High Sensitivity
6 General Electrical Specifications
DC Operating Parameters T
A
= 25
o
C, V
DD
= 12V (unless otherwise specified)
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
Output Update Frequency
F
OUT
Power-On Time
1
t
ON
Package Thermal Resistance
R
TH
Table 3: Electrical specifications
1
Test Conditions
Operating
B < B
RP
I
OUT
= 20mA, B > B
OP
B < B
RP,
V
OUT
= 24V
R
L
= 1k, C
L
= 20pF
R
L
= 1k, C
L
= 20pF
Min
3.5
0.5
Typ
2.5
0.3
0.01
0.25
0.25
25
301
Max
24
5
0.5
10
100
Single layer (1S) Jedec board
Units
V
mA
V
A
s
s
KHz
s
°C/W
The Power-On Time represents the time from reaching the power-on reset level to the first refresh of the
output (first valid output state).Value according simulation only, not subject to production test.
7 Magnetic Specifications
DC Operating Parameters T
A
= 25
o
C, V
DD
= 12V (unless otherwise specified)
Parameter
Symbol
Operating Point
B
OP
Release Point
B
RP
Hysteresis
B
HYST
Table 4: Magnetic specifications
Test Conditions
Min
3.8
2
1.5
Typ
5.5
3.5
2
Max
7.2
5
2.7
Units
mT
mT
mT
DC Operating Parameters T
A
= -40
o
C to 125
o
C (K-version), TA = -40
o
C to 85
o
C (E-version),
Parameter
Symbol
Operating Point
B
OP
Release Point
B
RP
Hysteresis
B
HYST
Table 5: Magnetic specifications
Test Conditions
Min
3.4
1.8
1
Typ
Max
7.7
5.4
2.8
VDD = 12V
Units
mT
mT
mT
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Data Sheet
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US5681
Unipolar Hall Switch – High Sensitivity
8 Output Behaviour versus Magnetic Pole
DC Operating Parameters T
A
= -40
o
C to 125
o
C, V
DD
= 3.5V to 24V (unless otherwise specified)
Parameter
Test Conditions
South pole
B > B
OP
Null or weak magnetic field
B
0 or B < B
RP
North pole
B > B
OP
Table 6: Output behaviour versus magnetic pole
OUT
Low
High
High
OUT = low (V
DSon
)
9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US5681 is a Hall-effect device with high magnetic
sensitivity. Its sensitivity enables high accuracy in position sensing by the use of small air gap.
The Correlated Double Sampling (CDS) technique suppresses the offset generally observed with Hall
sensors and amplifiers. The CMOS technology makes this advanced technique possible and contributes to
smaller chip size and lower current consumption than bipolar technology. The small chip size is also an
important factor to minimize the effect of physical stress.
This combination results in more accurate and stable magnetic characteristics, and enables faster and more
precise design.
The wide operating voltage from 3.5V to 24V and low current consumption make this device especially
suitable for solid state switch applications.
The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using
a pull-up resistor tied between a pull-up voltage and the device output.
10 Unique Features
The US5681 exhibits unipolar magnetic switching characteristics. Therefore, it operates only with one
magnetic pole.
Output level
OUT = High
OUT switches to High
OUT switches to Low
The US5681 device is south pole active:
Applying a south magnetic pole greater than B
OP
facing the
branded side of the package switches the output low.
Removing the magnetic field (B0) switches the output high.
The use of the opposite magnetic pole facing the branded side
does not affect the output state.
OUT = Low
0mT
B
RP
B
OP
Flux density
Unipolar switch characteristic
A magnetic hysteresis B
HYST
keeps B
OP
and B
RP
separated by a minimal value. This hysteresis prevents
output oscillation near the switching point.
3901005681
Rev 003
Page 5 of 11
Data Sheet
March/12
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