AH172
Internal Pull-up Hall Effect Latch
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. 0.4 May 7, 2004
1/6
Features
- Bipolar Hall effect latch sensor
- 3.0V to 20V DC operation voltage
- Built-in pull-up resistor
- 25mA output sink current
- Operating temperature: -20
C to 85C
- Package: SIP3, SOT23
Applications
- Rotor position sensing
- Current switch
- Encoder
- RPM detection
Pin Assignments
(SIP3 package)
( SOT23 package)
1. VCC
2. GND
3. OUT
1. VCC
3.
GND 2.
(Top view)
OUT
General Description
AH172 is a single digital output Hall-effect sensor
with pull-up resistor for high temperature operation.
The device includes an on-chip Hall voltage
generator for magnetic sensing, an amplifier to
amplify Hall voltage, and a comparator to provide
switching hysteresis for noise rejection, and an
output driver with a pull-up resistor (Rpu). An
internal bandgap regulator is used to provide
temperature compensated supply voltage for
internal circuits and allows a wide operating supply
range. While the magnetic flux density (B) is larger
than operate point (Bop), the OUT pin turns on
(low). If B removed toward release point (Brp), the
OUT pin is latched "on" state prior to B < Brp. When
B < Brp, the OUT pin go into " off " state.
Pin Descriptions
Name
Description
VCC
Positive power supply
GND
Ground
OUT
Output stage
Ordering Information
AH172 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
AH172
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.4 May 7, 2004
2/6
Block Diagram
AMP
REG.
R
pu
1
3
2
VCC
OUT
GND
Functional Application Circuit
M
Driver
&
Control Logic
I
a
I
b
I
c
I
A
I
C
I
B
H
B
H
A
H
C
M: Three Phase Hall Motor
Digital Hall Effect Sensor
Hall Motor Driver
RPM sensing
3 Phase Hall Motor
AH172
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.4 May 7, 2004
3/6
Absolute Maximum Ratings
( at Ta= 25
C )
Characteristics
Symbol
Values
Unit
Supply voltage
VCC
20
V
Output "off " voltage
V
out (off)
20 V
Output "on" current
I
o (sink)
25 mA
Operating temperature range
T
op
-20~+85
C
Storage temperature range
T
stg
-65~+150
C
SIP 550
mW
Power dissipation
SOT23
PD
230 mW
Electrical Characteristics
( Ta= 25
C )
Characteristics
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply voltage
Vcc
--
3
--
20
V
Output saturation voltage
Vout(sat)
VCC=12V, OUT "ON"
Io =10mA
-- 300
400 mV
Supply current
Icc
VCC=12V, OUT "OFF"
--
3.5
6
mA
Internal pull-up resistor
Rpu
--
7
10
13
K
Dropout voltage
Vd
Vd = Vcc-Vce
--
--
0.3
V
Magnetic Characteristics
(At Ta= 25
C )
(1mT = 10 Gauss)
A grade
Characteristics
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
15
-
60
Gauss
Release Point
Brp
-60
-
-15
Gauss
Hysteresis Bhy
-
80
-
Gauss
B grade
Characteristics
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
5
-
80
Gauss
Release Point
Brp
-80
-
-5
Gauss
Hysteresis Bhy
-
80
-
Gauss
AH172
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.4 May 7, 2004
4/6
Operating Characteristics
Marking side
S
N
B
hy
V
sat
V
cc
( Output Voltage )
V
d
B
rp
B
op
0
( Magnetic flux density )
V
out
High
Low
Marking side
S
N
( SIP3 )
( SOT23 )
Marking Information
(1) SOT23
(2) SIP3
J2 : AH172
XX YM X
Date code
Y : Year
M :Month (A~L)
(Top View)
ID code
A~Z: Non-Lead Free
a~z : Lead Free
172
YWW X
Date code
Y : Year
WW : Nth week
(Top View)
ID code
A~Z: Non-Lead Free
a~z : Lead Free
AH172
Internal Pull-up Hall Effect Latch
Anachip Corp.
www.anachip.com.tw
Rev 0.4 May 7, 2004
5/6
Package Information
(1) Package Type: SIP-3L
Active Area Depth
Sensor Location
1
2
3
2.10mm
1.55mm
0.51mm
NOM
BRANDED
SURFACE
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
Package Dimension
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