AUD | USD

A3213, A3214 Datasheet

Allegro MicroSystems, LLC

Download PDF Datasheet

Datasheet

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.
27622.62-DS Rev. 28
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
Micropower Ultra-Sensitive Hall-Effect Switches
Continued on the next page…
Functional Block Diagram
A3213 and A3214
TIMING
LOGIC
Dwg. FH-020-5
LATCH
GROUND
OUTPUT
SUPPLY
X
DYNAMIC
OFFSET CANCELLATION
SWITCH
SAMPLE
& HOLD
FEATURES AND BENEFITS DESCRIPTION
October 31, 2016
PACKAGES:
Not to scale
3-pin SOT23W
(suffix LH)
3-pin SIP,
matrix HD style
(suffix UA)
3-pin SIP,
chopper style
(suffix UA)
NOT FOR
NEW DESIGN
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
SELECTION GUIDE
Part Number Mounting Packing [1] Ambient [1], TA
(°C)
DC
(%)
IDD(AVG)(typ)
(µA)
A3213ELHLT-T LH package
Surface Mount
7-in. reel
3000 pieces/reel
–40 to 85
25 309
A3213ELHLX-T LH package
Surface Mount
13-in. reel
10000 pieces/reel
A3213EUA-T [2] UA package
SIP through hole
Bulk
500 pieces/bag
A3213LUA-T [2] UA package
SIP through hole
Bulk
500 pieces/bag –40 to 150
A3214ELHLT-T LH package
Surface Mount
7-in. reel
3000 pieces/reel
–40 to 85 0.10 6A3214ELHLX-T LH package
Surface Mount
13-in. reel
10000 pieces/reel
A3214EUA-T [2] UA package
SIP through hole
Bulk
500 pieces/bag
1 Contact Allegro for additional packing and operating temperature range options.
2 The chopper-style UA package is not for new design; the matrix HD style UA package is recommended for new designs.
These devices include, on a single silicon chip, a Hall-voltage
generator, small-signal amplifier, chopper stabilization, a latch,
and a MOSFET output. Advanced BiCMOS processing is used
to take advantage of low-voltage and low-power requirements,
component matching, very low input-offset errors, and small
component geometries.
Devices are rated for operation over a temperature range of
–40°C to 85°C or –40°C to 150°C. Two package styles provide a
magnetically optimized package for most applications. ‘LH’ is a
miniature low-profile surface-mount package, ‘UA is a three-
lead SIP for through-hole mounting. Each package is lead (Pb)
free (suffix, –T) , with a 100% matte-tin-plated leadframe.
DESCRIPTION (continued)
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Notes Rating Units
Supply Voltage VDD 6 V
Magnetic Flux Density B Unlimited G
Output Off Voltage VOUT 6 V
Output Current IOUT 1 mA
Operating Ambient Temperature TA
Range E –40 to 85 °C
Range L –40 to 150 °C
Maximum Junction Temperature TJ(max) 165 °C
Storage Temperature Tstg –65 to 170 °C
SPECIFICATIONS
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
VDD
GND
VOUT
12
3
Number Name Description
LH UA
1 1 VDD Input power supply; tie to GND with bypass capacitor
3 2 GND Ground
2 3 VOUT Output signal
Terminal List Table
1
VDD
GND
32
VOUT
X
LH Package, 3-Pin SOT23W Pinout Diagram UA Package, 3-Pin SIP Pinout Diagram
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
MAGNETIC CHARACTERISTICS [3]: valid over operating voltage and temperature range, unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ. [5] Max. Units [6]
Operate Points [4] BOPS South pole to branded side 42 70 G
BOPN North pole to branded side –70 –48 G
Release Points [4] BRPS South pole to branded side 10 32 G
BRPN North pole to branded side –38 –10 G
Hysteresis Bhys |BOPx - BRPx| 10 – G
3 As used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G.
4 BOPx = operate point (output turns ON); BRPx = release point (output turns OFF).
5 Typical Data is at TA = 25°C and VDD = 3.0 V and is for design information only.
6 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
ELECTRICAL CHARACTERISTICS: Valid over operating voltage and temperature range, unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ. [1] Max. Units
Supply Voltage Range VDD Operating [2] 2.4 3.0 5.5 V
Output Leakage Current IOFF VOUT = 5.5 V, BRPN < B < BRPS <1.0 1.0 µA
Output On Voltage VOUT(ON) Output on, IOUT = 1 mA, VDD = 3.0 V 100 300 mV
Awake Time tawake 60 90 µs
Period tperiod
A3213 240 360 µs
A3214, TA = 25°C, VDD = 3 V 60 90 ms
Duty Cycle DC A3213 – 25 – %
A3214 – 0.10 – %
Chopping Frequency fC– 340 – kHz
Supply Current
IDD(EN) Chip awake (enabled) 2.0 mA
IDD(DIS) Chip asleep (disabled) 8.0 µA
IDD(AVG)
A3213 309 850 µA
A3214 6 22 µA
1 Typical Data is at TA = 25°C and VDD = 3.0 V and is for design information only.
2 Operate and release points will vary with supply voltage. BOPx = operate point (output turns ON); BRPx = release point (output turns OFF).
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
5
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information
Characteristic Symbol Test Conditions [1] Value Units
Package Thermal Resistance RθJA
Package LH, 1-layer PCB with copper limited to solder pads 228 °C/W
Package LH, 2-layer PCB with 0.463 in.2 of copper area each side
connected by thermal vias 110 °C/W
Package UA, 1-layer PCB with copper limited to solder pads 165 °C/W
1 Additional thermal information available on Allegro website.
VDD(max)
Maximum Allowable VDD (V)
VDD(min)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
20 40 60 80 100 120 140 160 180
Temperature (°C)
Power Dissipation, P
D
(mW)
Power Dissipation versus Ambient Temperature
(R
θJA
= 165 ºC/W)
1-layer PCB, Package UA
(R
θJA
= 228 ºC/W)
1-layer PCB, Package LH
(R
θJA
= 110 ºC/W)
2-layer PCB, Package LH
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
6
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
TYPICAL OPERATING CHARACTERISTICS
Supply Voltage, VDD (V)
24
20
16
12
8
4
0
Supply Current, IDD(AVG) (µA)
0123456
Average Supply Current versus Supply Voltage
A3214
TA = 25°C
900
750
600
450
300
150
0
Supply Voltage, VDD (V)
Supply Current, IDD(AVG) (µA)
0123456
Average Supply Current versus Supply Voltage
TA = 25°C
A3213
Ambient Temperature, TA (°C)
24
20
16
12
8
4
0
Supply Current, IDD(AVG) (µA)
VDD = 2.4 V
VDD = 5.5 V
VDD = 3.0 V
-60 -40 -20 0 20 40 60 80 100
Average Supply Current versus Temperature
A3214
900
750
600
450
300
150
0
Ambient Temperature, TA (°C)
-60 -40 -20 0 20 40 60 80 100
VDD = 5.5 V
VDD = 2.4 V
VDD = 3.0 V
Supply Current, IDD(AVG) (µA)
Average Supply Current versus Temperature
A3213
BOP(S)
BOP(N)
BRP(S)
BRP(N)
Supply Voltage, VDD (V)
Magnetic Flux Density, B (G)
80
60
40
20
0
-20
-40
-60
-80
0123456
Switchpoints versus Supply Voltage
A3213 and A3214
TA = 25°C
BOP(S)
BOP(N)
BRP(S)
BRP(N)
80
60
40
20
0
-20
-40
-60
-80
-60 -40 -20 0 20 40 60 80 100
Ambient Temperature, TA (°C)
Magnetic Flux Density, B (G)
Switchpoints versus Ambient Temperature
A3213 and A3214
VDD = 5.5 V
BOP(S)
BOP(N)
BRP(S)
BRP(N)
80
60
40
20
0
-20
-40
-60
-80
-60 -40 -20 0 20 40 60 80 100
Ambient Temperature, TA (°C)
Magnetic Flux Density, B (G)
Switchpoints versus Ambient Temperature
A3213 and A3214
VDD = 2.4 V
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
7
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
FUNCTIONAL DESCRIPTION
Low Average Power
Internal timing circuitry activates the IC for 60 µs and deac-
tivates it for the remainder of the period (240 µs (typ) for the
A3213 and 60 ms (typ) for the A3214). 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 cur-
rent is not affected by the output state.
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 dynamic
offset cancellation technique, with an internal high-frequency
clock to reduce the residual offset voltage of the Hall element
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. This tech-
nique will also slightly degrade the device output repeatability.
A relatively high sampling frequency is used in order that faster
signals 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.
Operation
The output of this device switches low (turns on) when a mag-
netic field perpendicular to the Hall element exceeds the operate
point BOPS (or is less than BOPN). After turn-on, the output is
capable of sinking up to 1 mA and the output voltage is VOUT(ON).
When the magnetic field is reduced below the release point BRPS
(or increased above BRPN), the device output switches high (turns
off). The difference in the magnetic operate and release points is
the hysteresis (Bhys) of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
As used here, negative flux densities are defined as less than zero
(algebraic convention) and -50 G is less than +10 G.
0
PERIOD
60 µs "AWAKE"
"SLEEP"
IDD(EN)
IDD(DIS)
SAMPLE &
OUTPUT LATCHED
Dwg. EH-012-1
SAMPLE
& HOLD
X
+V
+V
HALL
VOLTAGE
B
+
Dwg. AH-011-2
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
8
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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 on the Allegro website: www.allegromicro.com.
0+B
0
-B
OUTPUT ON
OUTPUT ON
5 V
MAX BOPS
BRPS
BOPN
BRPN
OUTPUT VOLTAGE
MAGNETIC FLUX
OUTPUT OFF
OUTPUT
VDD
VOUT
GND
0.1
µF
10 pF
SUPPLY
(3 V BATTERY)
50 k
X
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
9
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Figure 1: Package LH, 3-Pin (SOT-23W)
A
B
C
D
C
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
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
Active Area Depth, 0.28 mm
Hall elements, not to scale
=Temperature Code (Letter)T
Standard Branding Reference View
NNT
Branding scale and appearance at supplier discretion
Seating Plane
Gauge Plane PCB Layout Reference View
0.55 REF
0.25 BSC
0.95 BSC
0.95
1.00
0.70
2.40
2
1
B
A
Branded Face
2.90 +0.10
–0.20
4° ±4°
8X 10°
REF
0.180 +0.020
–0.053
0.05 +0.10
–0.05
0.25 MIN
1.91 +0.19
–0.06
2.98 +0.12
–0.08
1.00 ±0.13
0.40 ±0.10
D
D
D
1.49
0.96
3
= Last three digits of device part numberN
CUSTOMER PACKAGE DRAWING
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Figure 2: Package UA, 3-Pin SIP, Matrix Style
For Reference Only – Not for Tooling Use
(Reference DWG-9049)
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
231
1.27 NOM
2.16 MAX
0.51 REF
0.79 REF
B
A
B
C
A
D
E
D
E
E
2.04
1.44 E
Branding scale and appearance at supplier discretion
Hall element, not to scale
Mold Ejector
Pin Indent
Branded
Face
4.09+0.08
–0.05
0.41 +0.03
–0.06
3.02+0.08
–0.05
0.43+0.05
–0.07
15.75 ±0.25
Dambar removal protrusion (6X)
Gate and tie bar burr area
Active Area Depth, 0.50 mm REF
NNT
Standard Branding Reference View
= Supplier emblem
= Last three digits of device part number
=Temperature code
N
45°
C
45°
2 X 10°
1.52 ±0.05
1
T
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
11
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Figure 3: Package UA, 3-Pin SIP, Chopper Style
NOT FOR
NEW DESIGN
Micropower Ultra-Sensitive Hall-Effect Switches
A3213 and
A3214
12
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Revision History
Number Date Description
25 October 29, 2012 Update product selection
26 January 6, 2015 Added LX option to Selection Guide
27 September 22, 2015 Corrected LH package Active Area Depth value; added AEC-Q100 qualification under Features
and Benefits
28 October 31, 2016 Chopper-style UA package designated as not for new design
For the latest version of this document, visit our website:
www.allegromicro.com
Copyright ©2016, Allegro MicroSystems, LLC
Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of
Allegro’s product can reasonably be expected to cause bodily harm.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.

Products

MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity44823
Unit Price1.61
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity28785
Unit Price1.62
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity13843
Unit Price1.65
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity20171
Unit Price1.91
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity15023
Unit Price1.91
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity0
Unit Price0.60788
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity0
Unit Price0.63539
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR SOT23W
Available Quantity0
Unit Price0
MAGNETIC SWITCH OMNIPOLAR 3SIP
Available Quantity0
Unit Price0