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PDF A3425 Data sheet ( Hoja de datos )
| Número de pieza | A3425 | |
| Descripción | Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch | |
| Fabricantes | Allegro MicroSystems | |
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A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Features and Benefits
▪ Two matched Hall effect switches on a single substrate
▪ Sensor Hall element spacing approximately 1 mm
▪ Superior temperature stability
▪ 3.3 to 18 V operation
▪ Integrated ESD diode from OUTPUT and VCC pins
to GND
▪ High-sensitivity switchpoints
▪ Robust structure for EMC protection
▪ Solid-state reliability
Description
The A3425 is a dual–output-channel, bipolar switch with
each channel comprising a separate complete Hall-effect
sensor circuit with dedicated Hall element and separate digital
output for speed and direction signal processing capability. The
independent Hall elements (E1 integrated with OUTPUTA, and
E2 integrated with OUTPUTB) are photolithographically aligned
to better than 1 μm. Maintaining this accurate mechanical
location between the two active Hall elements eliminates the
major manufacturing hurdle encountered in fine-pitch detection
applications.TheA3425 is a highly sensitive, temperature-stable
magnetic sensing device, which is ideal for use in ring magnet-
based speed and direction systems used in harsh automotive
and industrial environments.
The A3425 contains two independent Hall effect switches, and
Package: 8 pin SOIC (suffix L), and 4 pin
SIP (suffix K)
has a monolithic IC that accurately locates the two Hall elements,
E1 and E2, approximately 1 mm apart. The digital outputs are
90º out of phase so that the outputs are in quadrature, with the
proper ring magnet design. This allows for easy processing of
speed and direction signals. Extremely low-drift amplifiers
guarantee symmetry between the switches to maintain signal
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Not to scale
Continued on the next page…
Typical Application
VSupply
100 Ω
2
OUTPUTA
A3425
1
3
VCC
OUTPUTB
0.1 uF
GND
4
VOUTPUTB
VOUTPUTA
A3425DS-Rev. 6
Using unregulated supply
1 page  
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
OPERATING CHARACTERISTICS (continued) Valid over operating temperature ranges unless otherwise noted; typical
data applies to VCC = 12 V, and TA = 25ºC
Characteristic
Symbol
MAGNETIC CHARACTERISTICS, K Package5
Test Conditions
Min. Typ. Max Units
Operate Point: B > BOP
BOP(A), BOP(B)
Release Point: B < BRP
Hysteresis: BOP(A) – BRP(A),
BOP(B) – BRP(B)
Symmetry: Channel A, Channel B,
BOP(A) + BRP(A), BOP(B) + BRP(B)
Operate Symmetry: BOP(A) – BOP(B)
BRP(A), BRP(B)
BHYS(A), BHYS(B)
SYMA, SYMB
SYMAB(OP)
Release Symmetry: BRP(A) – BRP(B)
SYMAB(RP)
MAGNETIC CHARACTERISTICS, L Package5
–7
–35 –7
5 16
35
–
40
–40 –
–30 –
–30 –
40
30
30
G
G
G
G
G
G
Operate Point: B > BOP
BOP(A), BOP(B)
– 7 30 G
Release Point: B < BRP
Hysteresis: BOP(A) – BRP(A),
BOP(B) – BRP(B)
Symmetry: Channel A, Channel B,
BOP(A) + BRP(A), BOP(B) + BRP(B)
Operate Symmetry: BOP(A) – BOP(B)
BRP(A), BRP(B)
BHYS(A), BHYS(B)
SYMA, SYMB
SYMAB(OP)
–30 –7
5 14
–
35
–35 –
–25 –
35
25
G
G
G
G
Release Symmetry: BRP(A) – BRP(B)
SYMAB(RP)
–25 – 25 G
1 When operating at maximum voltage, never exceed maximum junction temperature, TJ(max). Refer to power derating curve charts.
2 Device will survive the current level specified, but operation within magnetic specification cannot be guaranteed.
3 Short circuit of the output to VCC is protected for the time duration specified.
4 Maximum specification limit is equivalent to ICC(max) + 3 mA.
5 Magnetic flux density, B, is indicated as a negative value for north-polarity magnetic fields, and as a positive value for south-polarity
magnetic fields. This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the
relative strength of the field is indicated by the absolute value of B, and the sign indicates the polarity of the field (for example, a
–100 G field and a 100 G field have equivalent strength, but opposite polarity).
EMC
Contact Allegro MicroSystems for EMC performance.
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A3425
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Electrical Operating Characteristics, Package L
8
7
6
5
4
3
2
1
0
0
ICC(off)
-40°C
25°C
150°C
5 10 15
VCC (V)
20
8
7
6
5
4
3
2
1
0
-50
ICC(off)
3.3 V
18 V
0 50 100 150 200
Temperature (°C)
8
7
6
5
4
3
2
1
0
0
ICC(on)
-40°C
25°C
150°C
5 10 15
VCC (V)
20
8
7
6
5
4
3
2
1
0
-50
ICC(on)
3.3 V
18 V
0 50 100 150
Temperature (°C)
200
500
400
300
200
100
0
-50
Output Saturation Voltage
VCC = 3.3 V, Isink = 20 mA
Ch. A
Ch. B
0 50 100 150 200
Temperature (°C)
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet A3425.PDF ] | |
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