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PDF ( 数据手册 , 数据表 ) A3213

零件编号 A3213
描述 Micropower Ultra-Sensitive Hall-Effect Switches
制造商 Allegro
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A3213 数据手册, 描述, 功能
A3213 and A3214
Micropower Ultra-Sensitive Hall-Effect Switches
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• Micropower operation
• Operate with north or south pole
• 2.4 to 5.5 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 assembly into applications due to magnetic pole
independence
Packages:
3 pin surface mount
SOT23-W (suffix LH)
3 lead ultramini SIP
(suffix UA)
Not to scale
DESCRIPTION
The A3213 and A3214 integrated circuits are ultra-sensitive,
pole-independent Hall-effect switches with a latched digital
output. They are especially suited for operation in battery-
operated, hand-held equipment such as cell and cordless
telephones and palmtop computers. A 2.4 to 5.5 V operation
and a unique clocking scheme reduce the average operating
power requirements: the A3213 to 825 µW, the A3214 to
14 µW (typical, at 2.75 V). Except for operating duty cycle
and average operating current, the A3213 and A3214 are
identical.
Unlike other Hall-effect switches, either a north or south
pole of sufficient strength will turn the output on; in the
absence of a magnetic field, the output is off. The polarity
independence and minimal power requirement allows these
devices to easily replace reed switches for superior reliabil-
ity and ease of manufacturing, while eliminating the require-
ment for signal conditioning.
Improved stability is made possible through chopper sta-
bilization (dynamic offset cancellation), which reduces the
residual offset voltage normally caused by device overmold-
ing, temperature dependencies, and thermal stress.
Continued on the next page…
SUPPLY
SWITCH
X
TIMING
LOGIC
OUTPUT
GROUND
27622.62-DS Rev. 27
Functional Block Diagram
Dwg. FH-020-5







A3213 pdf, 数据表
A3213 and
A3214
Micropower Ultra-Sensitive Hall-Effect Switches
Applications
Allegro's pole-independent sensing technique allows for opera-
tion with either a north pole or south pole magnet orientation,
enhancing the flexibility of the device in application assembling.
The technology provides the same output polarity for either pole
face.
It is strongly recommended that an external bypass capacitor be
connected (in close proximity to the Hall element) between the
supply and ground of the device to reduce both external noise
and noise generated by the chopper-stabilization technique. This
is especially true due to the relatively high impedance of battery
supplies.
The simplest form of magnet that will operate these devices is
a bar magnet with either pole near the branded surface of the
device. Many other methods of operation are possible. Exten-
sive applications information on magnets and Hall-effect devices
is also available in the Allegro application note 27701, or at
www.allegromicro.com
5V
MAX
B OPN
OUTPUT OFF
B OPS
GND
OUTPUT ON
0
-B
BRPN
BRPS
0
MAGNETIC FLUX
OUTPUT ON
+B
VOUT
10 pF
VDD
OUTPUT
50 k
0.1 µF
SUPPLY
(3 V BATTERY)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8














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