AH373
Internal Pull-up Hall Effect Latch
Features
- Bipolar Hall effect latch sensor
- 2.2V to 20V DC operation voltage
- Built-in pull-up resistor
- 25mA output sink current
- Operating temperature:
−
40
°
C ~
+
125
°
C
- Package: SIP3, SOT23
General Description
AH373 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 moves 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.
Applications
- Rotor position sensing
- Current switch
- Encoder
- RPM detection
Pin Assignment
Pin Descriptions
Name
Description
Positive Power Supply
Ground
Output Pin
373
2
373
1
3
VCC
(Top view)
1 : VCC
2 : GND
3 : OUT
GND
OUT
( SOT23 package)
1 2 3
(SIP3 package)
Ordering Information
AH373 X - X X X
Wafer Body
Blank or
A~Z : if necessary
to specify
Package
P: SIP-3L
W: SOT23-3L
Lead
L : Lead Free
Blank: Normal
Packing
Blank : Tube or Bulk
A : Tape & Reel
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. 0.0 Jan 31, 2005
1/6
AH373
Internal Pull-up Hall Effect Latch
Block Diagram
VCC
1
Regulator
Hall
plate
Rpu
3
2
OUT
Amp
2
GND
Functional Application Circuit
I
A
I
B
M
Digital Hall Effect Sensor
M: Three Phase Hall Motor
Driver
&
Control Logic
I
C
I
a
I
b
I
c
RPM sensing
H
A
H
B
H
C
Hall Motor Driver
3 Phase Hall Motor
Absolute Maximum Ratings
( at Ta= 25°C )
Characteristics
Supply voltage
Output “off ” voltage
Output “on” current
Operating temperature range
Storage temperature range
Power dissipation
SIP
SOT23
Symbol
VCC
Vout (off)
Io (sink)
Top
Tstg
PD
Values
20
28
25
-40~+125
-65~+150
550
230
Unit
V
V
mA
°C
°C
mW
mW
Anachip Corp.
www.anachip.com.tw
2/6
Rev 0.0 Jan 31, 2005
AH373
Internal Pull-up Hall Effect Latch
Electrical Characteristics
( Ta= 25°C, Vcc=12V )
Characteristics
Supply voltage
Output saturation voltage
Output Leakage Current
Supply current
Internal pull-up resistor
Symbol
Vcc
Vout(sat)
Ioff
Icc
Rpu
Conditions
—
Iout =20mA
B < Brp
OUT ”OFF”
—
Min.
2.2*
-
-
-
7
Typ.
-
300
<0.1
2
10
Max.
20
400
10
4
13
Unit
V
mV
uA
mA
KΩ
*Note:
The output of IC will be switched after the supply voltage is over 2.2V, but the magnetic characteristics won't be normal until the
supply is over 2.5V.
Magnetic Characteristics
Parameter
Operate Point
Release Point
Hysteresis
(Ta=25°C, Vcc=2.5V to 20V)
Symbol
Bop
Brp
Bhys
Min.
5
-60
-
Typ.
30
-30
60
(1mT=10Gauss)
Max.
Unit
60
Gauss
-5
Gauss
-
Gauss
Operating Characteristics
Output
S
S
Marking side
( Output Voltage )
( off-state )
Vcc
Turn off
Bhy
Turn on
( on-state )
Marking side
N
( SOT23 )
N
( SIP3 )
Vsat
Brp
0
Bop
Vsat
( Magnetic flux density B )
Anachip Corp.
www.anachip.com.tw
3/6
Rev 0.0 Jan 31, 2005
AH373
Internal Pull-up Hall Effect Latch
Performance Characteristics (SIP3)
Ta (°C)
Pd (mW)
Ta (°C)
Pd (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 (m W )
600
500
400
300
200
100
0
0
25
P o w e r D is s ip a tio n C u rv e
50
75
100
125
150
T a (。 C )
Performance Characteristics (SOT23-3)
Ta (°C)
Pd (mW)
25
230
50
184
60
166
70
147
80
129
90
110
100
92
110
74
120
55
125
46
130
37
140
18
150
0
P d (m W )
P o w e r D is s ip a tio n C u rv e
300
200
100
0
0
25
50
75
100
125
150
T a (。 C )
Anachip Corp.
www.anachip.com.tw
4/6
Rev 0.0 Jan 31, 2005
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