Single Output Hall Effect Latch
ATS177
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.A6 Jun 23, 2004
1/6
ATC
Features
- 3.5V to 20V DC operation voltage
- Temperature compensation
- Wide operating voltage range
- Open-Collector pre-driver
- 25mA maximum sinking output current.
- Reverse polarity protection
- Package: SIP3, SOT23
Applications
- Brush-less DC Motor
- Brush-less DC Fan
- Revolution counting
- Speed measurement
General Description
ATS177 is an integrated Hall effect latched 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 is used to provide
temperature compensated supply voltage for
internal circuits and allows a wide operating supply
range.
If a magnetic flux density larger than threshold Bop,
DO is turned on(low). The output state is held until
a magnetic flux density reversal falls below Brp
causing DO to be turned off (high).
Ordering Information
ATS177 X - X X X - X
Packing
Blank : Tube or Bulk
A : Tape & Reel
P: SIP3
W: SOT23
Package
Lead
L : Lead Free
Blank: Normal
Wafer Body
Magnetic
Characteristics
Blank or
A~Z : if necessary
to specify
A or B
Typical Application Circuit
+12V
U1
ATS177
VCC
1
GND
2
OUTPUT
3
Q1
NPN
Q2
NPN
R1
2K
R2
3K
D1
+ C1
0.47uF
+ C2
0.47uF
L1
L2
Brush-less DC Fan
Single Phase Hall Effect Latch
ATS177
Anachip Corp.
www.anachip.com.tw
Rev. A6 Jun 23, 2004
3/6
ATC
Absolute Maximum Ratings
( at Ta=25
o
C )
Characteristics
Symbol
Values
Unit
Supply voltage
V
CC
20 V
Reverse Vcc Polarity Voltage
V
RCC
-20 V
Magnetic flux density
B
Unlimited
Output OFF Voltage
Vce
30
V
Output "on" current
Continuous
Ic
25
mA
Operating temperature range
Ta
-20~+85
C
Storage temperature range
Ts
-65~+150
C
Maximum Junction Temp.
Tj
175
C
SIP-3L 400
mW
Package Power
Dissipation
SOT23-3L
Pd
200 mW
Electrical Characteristics
(Ta=+ 25
C)
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Units
Supply Voltage
Vcc
--
3.5
-
20
V
Output Saturation Voltage Vce(sat) Vcc=14V, Ic=20mA
-
300
700
mV
Output Leakage Current
Icex
Vce=14V, Vcc=14V
-
<0.1
10
uA
Supply Current
Icc
Vcc=20V, Output Open
-
5
10
mA
Output Rise Time
tr
Vcc=14V, RL=820
,
CL=20Pf
- 0.3
1.5
us
Output Falling Time
tf
Vcc=14V, RL=820
,
CL=20pF
- 0.3
1.5
us
Test Circuit
CL
14V
DO
RL=820 Ohm
CL=20 pF
RL
Test Circuit
Single Phase Hall Effect Latch
ATS177
Anachip Corp.
www.anachip.com.tw
Rev. A6 Jun 23, 2004
4/6
ATC
Magnetic Characteristics
(Ta= 25
C)
(1mT=10Gauss)
A grade
Parameter
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
5
-
70
Gauss
Release Point
Brp
-70
-
-5
Gauss
Hysteresis Bhys
-
80
-
Gauss
B grade
Parameter
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
-
-
100
Gauss
Release Point
Brp
-100
-
-
Gauss
Hysteresis Bhys
-
80
-
Gauss
12
10
8
6
4
2
OP
ON
OFF
RP
Output Voltage in Volts
-200
200
100
-100
0
Magnetic Flux Density in Gauss
DO
Vsat
Typical Magnetic Switch Point vs. Temperuture
-50
0
50
100
-20
25
80
100
Temperature (
o
C)
Flux
Dens
ity
(B)
Bop
Brp
Bhys
Single Phase Hall Effect Latch
ATS177
Anachip Corp.
www.anachip.com.tw
Rev. A6 Jun 23, 2004
5/6
ATC
Marking Information
(1) SOT23
(2) SIP3
J7:ATS177
XX YM X
Date code
Y : Year
M :Month (A~L)
(Top View)
ID code
A~Z: Non-Lead Free
a~z: Lead Free
177
YWW X
Date code
Y : Year
WW : Nth week
(Top View)
ID code
A~Z: Non-Lead Free
a~z : Lead Free
Package Information
(unit: mm)
(1)Package Type: SIP-3L
Active Area Depth
Sensor Location
1
2
3
2.10mm
1.55mm
0.51mm
NOM
BRANDED
SURFACE
Package Dimension
1.57mm
1.47mm
4.17mm
4.04mm
1.82
mm
15.50mm
13.00mm
1
2
3
1.27mm
0.41mm
0.41mm
45
45
0.38mm
0.7mm
3.10mm
2.97mm
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