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PDF A1421 Data sheet ( Hoja de datos )
| Número de pieza | A1421 | |
| Descripción | High Precision Hall Effect AC-Coupled Differential Sensor IC | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A1421, A1422, and A1423
High Precision Hall Effect AC-Coupled Differential Sensor IC
with Integrated Filter Capacitor
Features and Benefits
• Integrated tracking capacitor
• Used for sensing motion of ring magnet or ferrous targets
• Wide operating temperature range
• Operation with magnetic input signal frequency from
20 Hz to 30 kHz
• EMI/ESD-resistant
• Large effective air gaps
• 4.0 to 26.5 V supply operating range
• Output compatible with CMOS logic families
• Reverse battery protection
• Resistant to mechanical and thermal stress
• Accurate true zero crossing switchpoint (A1421 only)
• High vibration immunity, in running mode (A1423 only)
Package: 4 pin SIP (suffix K)
Description
The A1421, A1422, and A1423 are AC-coupled Hall-effect
sensor ICs which include monolithic integrated circuits that
switch in response to changing differential magnetic fields
created by rotating ring magnets or, when coupled with a
magnet, by ferrous targets. This family of devices also includes
an integrated capacitor that provides the high accuracy of analog
sensing without an external filter capacitor. This reduces cost
and components, while improving the reliability of the final
sensor solution.
Magnetic field changes affect the two integrated Hall
transducers and then are differentially amplified on the chip.
Differential design provides immunity to radial vibration,
within the device operating air gap range, by rejection of this
common-mode signal change. Steady-state system offsets
are eliminated using an on-chip differential bandpass filter
with integrated capacitor. This filter also provides relative
immunity to interference from electromagnetic sources. The
device utilizes advanced temperature compensation for the
high-pass filter, sensitivity, and Schmitt trigger switchpoints
to guarantee optimal operation to low frequencies over a wide
range of air gaps and temperatures.
Not to scale
Continued on the next page…
VS+
VCC
(Pin 1)
Functional Block Diagram
Dual Hall
Transducers
Regulator
0.1 uF
Hall
Amp
Gain
Stage
Bandpass Filter Integrated
Tracking Capacitor
VREF
Diagnostic
Circuitry
Comparator
TEST
(Pin 3)
VOUT
(Pin 2)
A1421a-DS, Rev. 4
GND
(Pin 4)
(Required)
1 page  
A1421, A1422,
and A1423
High Precision Hall Effect AC-Coupled Differential
Sensor IC with Integrated Filter Capacitor
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
RθJA Minimum-K PCB (single-sided with copper limited to solder pads)
*In still air. Additional thermal information available on Allegro Web site.
Value Units
177 ºC/W
Power Derating Curve
TJ(max) = 165°C; ICC = ICC(max)
30
28
26 VCC(max)
24
22
20
18
16
14
12 Minimum-K PCB
10 (RQJA = 177 ºC/W)
8
6
4 VCC(min)
2
0
20 40 60 80 100 120 140 160 180
Maximum Power Dissipation
TJ(max) = 165°C; ICC = ICC(max); VCC = VCC(max)
900
850
800
750
700
650
600
550
500
450
400
(RQMJAin=im1u7m7-ºKCP/WC)B
350
300
250
200
150
100
50
0
20 40 60 80 100 120 140 160 180
Temperature (°C)
Definitions of Terms
The following provide additional information about some of the
parameters cited. For additional information, visit the Allegro
Web site at www.allegromicro.com.
Applied Magnetic Field, Bdiff – The differential magnetic flux
density, which is calculated as the arithmetic difference of the
flux densities observed by each of the two Hall elements. fBdiff is
the input signal frequency.
Output Off Switchpoint (Operate Point), BOP – The value of
increasing differential magnetic flux density at which the device
output switches from low to high (A1421) or high to low (A1422
and A1423).
Output On Switchpoint (Release Point), BRP – The value of
decreasing differential magnetic flux density at which the device
output switches from high to low (A1421) or from low to high
(A1422 and A1423).
Power-On Time, tPO – The time needed by the device, after
power is applied, to initialize all circuitry necessary for proper
operation.
Settling Time, tSettling – The time required by the device, after
tPO, and after a valid magnetic signal has been applied, to
provide proper output transitions. Settling time is a function of
magnetic offset, offset polarity, signal phase, signal frequency,
and signal amplitude.
Supply Current (on), ICC(on) – The current draw of the device
with the output transitor is turned on.
Supply Current (off), ICC(off) – The current draw of the device
with the output transitor is turned off.
Response Time, tResponse – The total time required for generating
zero-crossing output transitions after initialization (the sum of
Power-on Time and Settling Time).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1421, A1422,
and A1423
High Precision Hall Effect AC-Coupled Differential
Sensor IC with Integrated Filter Capacitor
Device Evaluation: EMC Characterization
Please contact Allegro MicroSystems for EMC performance information.
Test Name
ESD – Human Body Model*
Reference Specification
AEC-Q100-002
ESD – Machine Model
AEC-Q100-003
Conducted Transients
ISO 7637-1
Direct RF Injection
ISO 11452-7
Bulk Current Injection
ISO 11452-4
TEM Cell
ISO 11452-3
*ESD test is done with no external components.
Vs
R2
C1 1
VCC
A1421, A1422
4
GND
or A1423 VOUT 2
TEST
3
R1
C2
Component Value Units
R1* 1 kΩ
R2 100 Ω
C1 0.1 μF
C2 0.1 ηF
*Pull-up resistor not required for
protection but for normal operation.
Recommended EMC test circuit. Test circuit recommended
configuration may change after evaluation of first silicon.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet A1421.PDF ] | |
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