ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Description
ATS177 is an integrated Hall-Effect latch sensor designed for
electronic commutation of brush-less DC motor applications.
The device includes an on-chip Hall voltage generator for
magnetic sensing, a comparator that amplifies the Hall
voltage, and a schmitt trigger to provide switching hysteresis
for noise rejection, and open-collector output. An internal
bandgap regulator provides a temperature compensated
supply voltage for internal circuits and allows a wide operating
supply range.
When the magnetic flux density (B) is larger than operate
point (Bop), output is switched on (DO pin is pulled low). The
output state is held on until a magnetic flux density reversal
falls below Brp. When
B
is less than Brp, the output is
switched off.
The ATS177 is available in SIP-3L package.
Pin Assignments
(Top View)
3. DO
2. GND
1. Vcc
SIP-3L
Applications
•
•
•
•
Brush-less DC Motor
Brush-less DC Fan
Revolution counting
Speed measurement
Features
•
•
•
•
•
•
•
•
•
Bipolar Hall-Effect latch sensor
3.5V to 20V DC operating voltage
Temperature compensation
Open-collector pre-driver
25mA maximum output sink current
Built-in reverse polarity protection
Operating temperature: -40°C to +125°C
SIP-3L package
Green Molding Compound (No Br, Sb) (Note 1)
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Notes:
Typical Application Circuit
+12V
D1
R1
2K
U1
L1
L2
R2
1
VCC OUTPUT
GND
2 ATS177
3
Q1
NPN
3K
+
C1
0.47uF
Q2
NPN
+
C2
0.47uF
Brush-less DC Fan
ATS177
Document number: DS31055 Rev. 6 - 2
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July 2010
© Diodes Incorporated
ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Pin Descriptions
Pin name
Vcc
GND
DO
P/I/O
P
P
O
Pin #
1
2
3
Description
Positive power supply
Ground
Digital output
Functional Block Diagram
Vcc
1
Regulator
Hall
plate
3
2
DO
Amp
2
GND
Absolute Maximum Ratings
(T
A
= 25°C)
Symbol
V
CC
V
RCC
B
V
CE
P
D
I
C
T
J(MAX)
T
S
Characteristics
Supply Voltage
Reverse V
CC
Polarity Voltage
Magnetic Flux Density
Output OFF Voltage
Package Power Dissipation
Output “ON” Current
Maximum Junction Temperature
Storage Temperature Range
Rating
20
-20
Unlimited
30
550
25
150
-65~+150
Unit
V
V
V
mW
mA
°C
°C
SIP-3L
Continuous
Recommended Operating Conditions
Symbol
V
CC
T
A
Notes:
Characteristic
Supply Voltage
Operating Ambient Temperature
(Note 2)
Conditions
Operating
Operating
Min
3.5
-20
Max
20
85
Unit
V
°C
2. Shall not exceed P
D
and Safety Operation Area.
ATS177
Document number: DS31055 Rev. 6 - 2
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July 2010
© Diodes Incorporated
ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Electrical Characteristics
(T
A
= 25°C)
Symbol
V
CE
(sat)
Icex
Icc
tr
tf
Characteristic
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Falling Time
Test Conditions
V
CC
= 14V, Ic = 20mA
V
CE
= 14V, V
CC
= 14V
V
CC
= 20V, Output Open
V
CC
= 14V, RL = 820Ω, CL = 20pF
V
CC
= 14V, RL = 820Ω, CL = 20pF
Min
-
-
-
-
-
Typ.
300
<0.1
5
0.3
0.3
Max
700
10
10
1.5
1.5
Unit
mV
uA
mA
us
us
Test Circuit
14V
DO
RL
RL=820 Ohm
CL=20 pF
CL
Test Circuit
ATS177
Document number: DS31055 Rev. 6 - 2
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July 2010
© Diodes Incorporated
ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Magnetic Characteristics
(T
A
= 25°C, Note 3)
(1mT=10 Gauss)
A grade
Symbol
Bops(south pole to brand side)
Brps(south pole to brand side)
Bhy(|Bopx|-|Brpx|)
B grade
Symbol
Bops(south pole to brand side)
Brps(south pole to brand side)
Bhy(|Bopx|-|Brpx|)
Notes:
Parameter
Operation Point
Release Point
Hysteresis
Min
5
-70
-
Typ.
-
-
80
Max
70
-5
-
Unit
Gauss
Gauss
Gauss
Parameter
Operation Point
Release Point
Hysteresis
Min
-
-100
-
Typ.
-
-
80
Max
100
-
-
Unit
Gauss
Gauss
Gauss
3. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
DO
Output Voltage in Volts
OFF
12
10
8
6
4
OP
RP
Vsat
-200
-100
0
2
ON
100
200
Magnetic Flux Density in Gauss
Typical Magnetic Switch Point vs. Temperuture
100
Flux Density (B)
50
0
Bop
Brp
Bhys
-50
-20
25
80
o
100
Temperature ( C)
ATS177
Document number: DS31055 Rev. 6 - 2
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© Diodes Incorporated
ATS177
SINGLE OUTPUT HALL EFFECT LATCH
Performance Characteristics
(1) SIP-3L
T
A
(°C)
P
D
(mW)
T
A
(°C)
P
D
(mW)
25
550
105
198
50
440
110
176
60
396
115
154
70
352
120
132
80
308
125
110
85
286
130
88
90
264
135
66
95
242
140
44
100
220
150
0
P
D
(mW)
6 00
5 00
4 00
3 00
2 00
1 00
0
0
-40
25
Power Dissipation Curve
50
75
85
100
1 25
T
A
(
o
C)
15 0
ATS177
Document number: DS31055 Rev. 6 - 2
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July 2010
© Diodes Incorporated