US5782
Unipolar Hall Switch – Medium Sensitivity
Features and Benefits
Wide operating voltage range from 3.5V to 24V
Medium 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.
US5782
Temperature Code
L (-40° to 150°C)
C
Package Code
SE (TSOT-3L)
1 Functional Diagram
2 General Description
The Melexis US5782 is a unipolar Hall-effect
switch designed in mixed signal CMOS
technology.
The device integrates a voltage regulator, Hall
sensor with dynamic offset cancellation system,
Schmitt trigger and an open-drain output driver, all
in a single package.
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.
3901005782
Rev 004
Page 1 of 10
Data Sheet
Apr/06
US5782
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
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 SE Package Information (TSOT-3L)............................................................................. 9
17 Disclaimer.................................................................................................................... 10
3901005782
Rev 004
Page 2 of 10
Data Sheet
Apr/06
US5782
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
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 150
-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
3901005782
Rev 004
Page 3 of 10
Data Sheet
Apr/06
US5782
Unipolar Hall Switch – Medium Sensitivity
6 General Electrical Specifications
DC Operating Parameters T
A
= 25 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
Maximum Switching Frequency
F
SW
Package Thermal Resistance
R
TH
Table 3: Electrical specifications
Test Conditions
Operating
B < B
RP
I
OUT
= 20mA, B > B
OP
B < B
RP,
V
OUT
= 24V
R
L
= 1kΩ, C
L
= 20pF
R
L
= 1kΩ, C
L
= 20pF
Single layer (1S) Jedec board
Min
3.5
0.5
Typ
12
2.5
0.13
0.01
0.25
0.25
10
301
Max
24
5
0.5
10
Units
V
mA
V
µA
µs
µs
KHz
°C/W
o
7 Magnetic Specifications
DC Operating Parameters T
A
= 25 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
7
3.5
2
Typ
12
7
5
Max
15
10
7
Units
mT
mT
mT
o
8 Output Behaviour versus Magnetic Pole
DC Operating Parameters T
A
= -40 C to 150 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 5: Output behaviour versus magnetic pole
OUT
Low
High
High
o
o
South pole
OUT = low (V
DSon
)
3901005782
Rev 004
Page 4 of 10
Data Sheet
Apr/06
US5782
Unipolar Hall Switch – Medium Sensitivity
9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US5782 is a Hall-effect device with medium magnetic
sensitivity. Its sensitivity enables high accuracy in position sensing by the use of small air gap.
The chopper-stabilized amplifier uses switched capacitor technique to suppress 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 stable magnetic characteristics and enables faster and more precise design.
The wide operating voltage from 3.5V to 24V, wide operating temperature according “L” specification and low
current consumption make this device especially suitable for automotive and 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 US5782 exhibits unipolar magnetic switching characteristics. Therefore, it operates only with one
magnetic pole.
The US5782 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 (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 hysteresis prevents
output oscillation near the switching point.
3901005782
Rev 004
Page 5 of 10
Data Sheet
Apr/06
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