Hall voltage, a schmitt trigger to provide switching
hysteresis for noise rejection, and an open-collector
output. The bandgap regulator allows a wide
operating voltage range.
ATS137 is rated for operating temperature range
from -20°C to 85°C and voltage range from 3.5V to
20V.
Applications
- VCD/DVD loader, CD/DVD ROM
- Cover detector
- Speed measurement
- Home appliances
- Home safety
Ordering Information
ATS137 X - X X X - X
Magnetic
Characteristics
A or B
Single Hall-effect Switch
Wafer Body
Blank or
A~Z : if necessary
to specify
Package
P: SIP3
W: SOT23
Lead
L : Lead Free
Blank: Normal
Packing
Blank : Tube or Bulk
A : Tape & Reel
Typical Circuit
3.5V ~20V
Vcc
R
L
ATS
137
Vss
DO
Digital Output
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.A5 Jul 14, 2004
1/7
ATC
Single Hall Effect Switch
Functional Block Diagrams
Vcc
1
ATS137
Regulator
Hall
plate
Amp
3
DO
2
Vss
Pin Descriptions
137
2
Top view
137
1 : Vcc
1
3
2 : Vss
3 : DO
1
2
3
Name
Vcc
Vss
DO
P/I/O
P
P
O
Pin #
1
2
3
Description
Positive Power Supply
Ground
Digital Output
Anachip Corp.
www.anachip.com.tw
2/7
Rev. A5 Jul 14, 2004
ATC
Single Hall Effect Switch
Absolute Maximum Ratings
Characteristics
Supply voltage
Reverse Vcc Polarity Voltage
Magnetic flux density
Output OFF Voltage
Output “on” current
Continuous
Operating temperature
Storage temperature
Maximum Junction Temp.
SIP-3L
Package Power
Dissipation
SOT23-3L
( at Ta=25
o
C )
Symbol
V
CC
V
RCC
B
Vce
Ic
Ta
Ts
Tj
Pd
(Ta=+ 25°C)
Test Conditions
—
Vcc=14V, Ic=20mA
Vce=14V, Vcc=14V
Vcc=20V, Output Open
Vcc=14V, RL=820Ω,
CL=20pF
Vcc=14V, RL=820Ω,
CL=20pF
Min
3.5
-
-
-
-
-
Typ
-
300
<0.1
5
0.3
0.3
Max
20
700
10
10
1.5
1.5
Units
V
mV
uA
mA
us
us
Values
20
-20
Unlimited
30
25
-20~+85
-65~+150
175
400
200
V
mA
°C
°C
°C
mW
mW
Unit
V
V
ATS137
Electrical Characteristics
Characteristic
Supply voltage
Output saturation voltage
Output leakage current
Supply current
Output rise time
Output falling time
Symbol
Vcc
Vce(sat)
Icex
Icc
tr
tf
Test Circuit
14V
DO
RL
RL=820 Ohm
CL=20 pF
CL
Test Circuit
Anachip Corp.
www.anachip.com.tw
3/7
Rev. A5 Jul 14, 2004
ATC
Single Hall Effect Switch
Magnetic Characteristics (Ta=25
o
C)
(1mT=10Gauss)
A grade
Parameter
Operate Point
Release point
Hysteresis
B grade
Parameter
Operate Point
Release point
Hysteresis
Symbol
Bop
Brp
Bhys
Symbol
Bop
Brp
Bhys
Min.
-
10
-
Min.
-
10
-
Typ.
-
-
80
Typ.
-
-
80
Max.
100
-
-
Max.
130
-
-
Unit
Gauss
Gauss
Gauss
Unit
Gauss
Gauss
Gauss
ATS137
Application Information
-Operating principle
ATS137 is a three pins Hall Effect switch IC which can turn magnetic flux variety to digital output signal. In
other words, it is an interface from magnetic system to electrical one by Hall effect. The illustrations are shown
in Fig.1.
Vo
Vcc
B
hys
Magnet
Turn on
magnetic flux
(Gauss)
S
Turn off
Vce(sat)
Marking
side
B
rp
B
op
electrical
Fig.1 Hall-effect switch
Output driver is open-collector topology and maximum sink current (I
sink
) is 25mA. The illustrated circuit is
shown as Fig.2.
3.5V ~20V
Vcc
R
L
DO
Vo
ATS
137S
Vss
I
sink
Digital Output
Fig.2 Application circuit
Anachip Corp.
www.anachip.com.tw
4/7
Rev. A5 Jul 14, 2004
ATC
Single Hall Effect Switch
Application Information (Continued)
Vo will turn on(low) if the S magnetic flux larger than operation point (Bop), and turns off whenever the
magnetic flux is removed and lower than release point (Brp). The related waveforms are shown in Fig.3.
ATS137
magnetic flux (mT)
Bop
S
Marking side
Vo
Hall Effect switch
Vcc
Vce(sat)
t
t
Brp
Fig.3 Vo and magnetic flux variety
The major applications are for contactless switching and shown as follows:
-
VCD/DVD loader, CD/DVD ROM: Detect if the tray is opened or closed
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