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A3212 데이터시트 PDF




Allegro MicroSystems에서 제조한 전자 부품 A3212은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 A3212 기능
기능 Micropower, Ultrasensitive Hall-Effect Switches
제조업체 Allegro MicroSystems
로고 Allegro MicroSystems 로고


A3212 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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A3212 데이터시트, 핀배열, 회로
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• Micropower operation
• Operation with north or south pole
• 2.5 to 3.5 V battery operation
• Chopper stabilized
□Superior temperature stability
□Extremely low switchpoint drift
□Insensitive to physical stress
• High ESD protection
• Solid-state reliability
• Small size
• Easily manufacturable with magnet pole independence
Packages:
DFN (EL)
DFN (EH)
SOT23W (LH) Not to scale
SIP (UA)
A3211 and A3212
Micropower, Ultrasensitive
Hall-Effect Switches
DESCRIPTION
TheA3211 andA3212 integrated circuits are ultrasensitive, pole
independent Hall-effect switches with latched digital output.
These devices are especially suited for operation in battery-
operated, hand-held equipment such as cellular and cordless
telephones, pagers, and palmtop computers. A 2.5 to 3.5 V
operation and a unique clocking scheme reduce the average
operating power requirements to less than 15 μW with a
2.75 V supply.
Unlike other Hall-effect switches, either a north or south pole
of sufficient strength will turn the output on in the A3212,
and in the absence of a magnetic field, the output is off. The
A3211 provides an inverted output. The polarity independence
and minimal power requirements allow these devices to easily
replace reed switches for superior reliability and ease of
manufacturing, while eliminating the requirement for signal
conditioning.
Improved stability is made possible through chopper
stabilization (dynamic offset cancellation), which reduces the
residual offset voltage normally caused by device overmolding,
temperature dependencies, and thermal stress.
This device includes on a single silicon chip a Hall-voltage
generator, small-signal amplifier, chopper stabilization, a
latch, and a MOSFET output. Advanced CMOS processing
is used to take advantage of low-voltage and low-power
Continued on next page....
SUPPLY
SWITCH
X
TIMING
LOGIC
OUTPUT
GROUND
3211-DS, Rev. 22
Functional Block Diagram
Dwg. FH-020-5




A3212 pdf, 반도체, 판매, 대치품
A3211 and
A3212
Micropower, Ultrasensitive
Hall-Effect Switches
ELECTRICAL CHARACTERISTICS: over operating voltage and temperature range (unless otherwise specified).
Characteristic
Symbol
Test Conditions
Min.
Limits
Typ.*
Max.
Units
Supply Voltage Range
Output Leakage Current
Output On Voltage
Awake Time
Period
Duty Cycle
VDD
IOFF
VOUT
tawake
tperiod
d.c.
Operating
VOUT = 3.5 V, Output off
IOUT = 1 mA, VDD = 2.75 V
2.5 2.75
3.5
<1.0
1.0
– 100 300
– 45 90
– 45 90
– 0.1
V
µA
mV
µs
ms
%
Chopping Frequency
fC
IDD(EN)
Chip awake (enabled)
Supply Current
IDD(DIS)
IDD(AVG)
Chip asleep (disabled)
VDD = 2.75 V
VDD = 3.5 V
* Typical data is at TA = 25°C and VDD = 2.75 V, and is for design information only.
– 340 –
kHz
– – 2.0 mA
– – 8.0 µA
– 5.1 10
µA
– 6.7 10
µA
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A3212 전자부품, 판매, 대치품
A3211 and
A3212
Micropower, Ultrasensitive
Hall-Effect Switches
FUNCTIONAL DESCRIPTION
Low Average Power
Internal timing circuitry activates the IC for 45 µs and deactivates
it for the remainder of the period (45 ms). A short "awake" time
allows for stabilization prior to the sampling and data latching on
the falling edge of the timing pulse. The output during the "sleep"
time is latched in the last sampled state. The supply current is not
affected by the output state.
+V
B
IDD(EN)
"AWAKE"
PERIOD
"SLEEP"
SAMPLE &
OUTPUT LATCHED
IDD(DIS)
0
Dwg. WH-017-2
Chopper-Stabilized Technique
The Hall element can be considered as a resistor array similar to a
Wheatstone bridge. A large portion of the offset is a result of the
mismatching of these resistors. These devices use a proprietary
dynamic offset cancellation technique, with an internal high-fre-
quency clock to reduce the residual offset voltage of the Hall ele-
ment that is normally caused by device overmolding, temperature
dependencies, and thermal stress. The chopper-stabilizing tech-
nique cancels the mismatching of the resistor circuit by chang-
ing the direction of the current flowing through the Hall plate
using CMOS switches and Hall voltage measurement taps, while
maintaing the Hall-voltage signal that is induced by the external
magnetic flux. The signal is then captured by a sample-and-hold
circuit and further processed using low-offset bipolar circuitry.
This technique produces devices that have an extremely stable
quiescent Hall output voltage, are immune to thermal stress, and
have precise recoverability after temperature cycling. A relatively
high sampling frequency is used for faster signal processing capa-
bility can be processed.
More detailed descriptions of the circuit operation can be found
in: Technical Paper STP 97-10, Monolithic Magnetic Hall Sensing
Using Dynamic Quadrature Offset Cancellation and Technical
Paper STP 99-1, Chopper-Stabilized Amplifiers With A Track-and-
Hold Signal Demodulator.
+V
X
HALL
VOLTAGE
+
Dwg. AH-011-2
Dwg. EH-012-1
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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