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PDF A3212 Data sheet ( Hoja de datos )
| Número de pieza | A3212 | |
| Descripción | Micropower, Ultrasensitive Hall-Effect Switches | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A3212 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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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
1 page  
A3211 and
A3212
Micropower, Ultrasensitive
Hall-Effect Switches
A3211 MAGNETIC CHARACTERISTICS over operating voltage range (unless otherwise specified)
Characteristic
Symbol
Test Conditions
Over Temperature Range E: TA = –40°C to 85°C
Operate Points
BOPS
BOPN
South pole to branded side; B > BOP, VOUT = High (Output Off)
North pole to branded side; B > BOP, VOUT = High (Output Off)
Release Points
BRPS
BRPN
South pole to branded side; B < BRP, VOUT = Low (Output On)
North pole to branded side; B < BRP, VOUT = Low (Output On)
Hysteresis
BHYS
|BOPx - BRPx|
NOTES:
1. Negative flux densities are defined as less than zero (algebraic convention), i.e., -50 G is less than +10 G.
2. BOPx = operate point (output turns off); BRPx = release point (output turns on).
3. Typical Data is at TA = +25°C and VDD = 2.75 V and is for design information only.
4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
Min.
–
–55
10
–
–
Limits
Typ. Max.
37 55
–40 –
31 –
–34 –10
5.9 –
Units
G
G
G
G
G
A3212 MAGNETIC CHARACTERISTICS over operating voltage range (unless otherwise specified)
Characteristic
Symbol
Test Conditions
Over Temperature Range E: TA = –40°C to 85°C
Operate Points
BOPS
BOPN
South pole to branded side; B > BOP, VOUT = Low (Output On)
North pole to branded side; B > BOP, VOUT = Low (Output On)
Release Points
BRPS
BRPN
South pole to branded side; B < BRP, VOUT = High (Output Off)
North pole to branded side; B < BRP, VOUT = High (Output Off)
Hysteresis
BHYS
|BOPx - BRPx|
Over Temperature Range L: TA = –40°C to 150°C
Operate Points
BOPS
BOPN
South pole to branded side; B > BOP, VOUT = Low (Output On)
North pole to branded side; B > BOP, VOUT = Low (Output On)
Release Points
BRPS
BRPN
South pole to branded side; B < BRP, VOUT = High (Output Off)
North pole to branded side; B < BRP, VOUT = High (Output Off)
Hysteresis
BHYS
|BOPx - BRPx|
NOTES:
1. Negative flux densities are defined as less than zero (algebraic convention), i.e., -50 G is less than +10 G.
2. BOPx = operate point (output turns on); BRPx = release point (output turns off).
3. Typical Data is at TA = +25°C and VDD = 2.75 V and is for design information only.
4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
Min.
–
–55
10
–
–
–
–65
10
–
–
Limits
Typ.
Max.
37 55
–40 –
31 –
–34 –10
5.9 –
37 65
–40 –
31 –
–34 –10
5.9 –
Units
G
G
G
G
G
G
G
G
G
G
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A3211 and
A3212
Micropower, Ultrasensitive
Hall-Effect Switches
2.90
+0.10
–0.20
8X 10°
REF
2.98
+0.12
–0.08
3
D
1.49
For Reference Only – Not for Tooling Use
(Reference DWG-2840)
Dimensions in millimeters – NOT TO SCALE
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
4° ±4°
A
0.180
+0.020
–0.053
0.96 D
1.91
+0.19
–0.06
D
2.40
0.70
0.25 MIN
1.00
12
0.55 REF
0.25 BSC
0.95
Branded Face
Seating Plane
Gauge Plane
B PCB Layout Reference View
1.00 ±0.13
0.95 BSC
0.05
+0.10
–0.05
0.40 ±0.10
A Active Area Depth, 0.28 mm
B Reference land pattern layout; all pads a minimum of 0.20 mm from all adjacent pads;
adjust as necessary to meet application process requirements and PCB layout tolerances
C Branding scale and appearance at supplier discretion
D Hall elements, not to scale
Package LH, 3-Pin SOT-23W
NNN
C Standard Branding Reference View
N = Last three digits of device part number
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 13 Páginas | |
| PDF Descargar | [ Datasheet A3212.PDF ] | |
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