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A3214 Schematic ( PDF Datasheet ) - Allegro

Teilenummer A3214
Beschreibung Micropower Ultra-Sensitive Hall-Effect Switches
Hersteller Allegro
Logo Allegro Logo 




Gesamt 11 Seiten
A3214 Datasheet, Funktion
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






A3214 Datasheet, Funktion
A3213 and
A3214
Micropower Ultra-Sensitive Hall-Effect Switches
TYPICAL OPERATING CHARACTERISTICS
A3213 and A3214
Switchpoints versus Ambient Temperature
VDD = 2.4 V
80
60 BOP(S)
40
20 BRP(S)
0
-20 BRP(N)
-40
-60 BOP(N)
-80
-60
-40 -20 0 20 40 60 80
Ambient Temperature, TA (°C)
100
A3213 and A3214
Switchpoints versus Ambient Temperature
VDD = 5.5 V
80
60 BOP(S)
40
20 BRP(S)
0
-20
-40 BRP(N)
-60
-80
-60
BOP(N)
-40 -20 0 20 40 60 80
Ambient Temperature, TA (°C)
100
A3213 and A3214
Switchpoints versus Supply Voltage
TA = 25°C
80
60
BOP(S)
40
20 BRP(S)
0
-20
BRP(N)
-40
-60
BOP(N)
-80
012345
Supply Voltage, VDD (V)
6
A3213
Average Supply Current versus Temperature
A3214
Average Supply Current versus Temperature
900 24
750 20
600 VDD = 5.5 V
450
VDD = 3.0 V
300
VDD = 2.4 V
150
0
-60 -40 -20 0
20 40 60 80 100
Ambient Temperature, TA (°C)
A3213
Average Supply Current versus Supply Voltage
TA = 25°C
900
16 VDD = 5.5 V
12
8 VDD = 3.0 V
4
VDD = 2.4 V
0
-60 -40 -20 0
20 40 60 80 100
Ambient Temperature, TA (°C)
A3214
Average Supply Current versus Supply Voltage
TA = 25°C
24
750 20
600 16
450 12
300 8
150 4
0
0123456
Supply Voltage, VDD (V)
0
0123456
Supply Voltage, VDD (V)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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