3213

A3214ELHL ALLEGRO

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Technical content

The A3213xx and A3214xx integrated circuits are ultra-sensitive, pole in de pen dent Hall-effect switches with a latched digital output. They are es pe cial ly suited for operation in battery-operated, hand-held equip ment such as cellular and cordless tele phones, pagers, and palmtop com put ers. A 2.4 volt to 5.5 volt operation and a unique clocking scheme reduce the average op er - at ing power requirements – the A3213xx to 825 µW, the A3214xx to 14 µW (typical at 2.75 V)! Except for operating duty cycle and average operating current, the A3213xx and A3214xx are identical. Unlike other Hall-effect switches, either a north or south pole of suf fi cient 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 reliability and ease of manufacturing, while eliminating the requirement for signal conditioning. Improved stability is made possible through chopper stabilization (dy- nam ic offset cancellation), which reduces the residual offset voltage normally caused by device overmolding, temperature de pen den cies, and thermal stress. These devices include on a single silicon chip a Hall-voltage generator, small-signal amplifier, chopper sta bi li za tion, 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. Range 'E' devices are rated for operation over a tem per a ture range of -40°C to +85°C; range 'L' devices are rated for operation over a tem per a ture range of -40°C to +150°C. Two package styles provide a mag net i cal ly op ti - mized pack age for most ap pli ca tions. ‘LH’ is a min ia ture low-profile surface- mount package, ‘UA’ is a three-lead SIP for through-hole mounting. Each package is available in a lead (Pb) free version (suffix, –T) , with a 100% matte tin plated leadframe.

FEATURES

■ Micropower Operation ■ Operate With North or South Pole ■ 2.4 V to 5.5 V Battery Operation ■ Chopper Stabilized Superior Temperature Stability Extremely Low Switch-Point Drift Insensitive to Physical Stress ■ ESD Protected to 5 kV ■ Sol id-State Reliability ■ Small Size ■ Easily Manufacturable With Magnet Pole Independence Data Sheet 27622.62F Package Designator ‘LH’ Pinning (SOT23W)

3213 AND

at TA = +25°C Operating Temperature Range, TA Storage Temperature Range, Caution: These CMOS devices have input static protection (Class 3) but are still sus- ceptible to damage if exposed to extremely high static electrical charges. Pinning is shown viewed from branded side. MICROPOWER, ULTRA-SENSITIVE HALL-EF FECT SWITCHES Dwg. PH-016-1 VDD SUPPLY OUTPUT GROUND

3213 AND 3214

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-50002 Product Selection Guide Part Number Pb-free Packing* Mounting Ambient, TA (ºC) DC (%) IDDAVG(TYP) (µA) A3213ELHLT – 7-in. reel 3000 pieces/reel Surface Mount –40 to 85 25 460 A3213ELHLT-T Yes A3213EUA – Bulk 500 pieces/bag SIP through hole A3213EUA-T Yes A3213LLHLT – 7-in. reel 3000 pieces/reel Surface Mount –40 to 150 A3213LLHLT-T Yes A3213LUA – Bulk 500 pieces/bag SIP through hole A3213LUA-T Yes A3214ELHLT – 7-in. reel 3000 pieces/reel Surface Mount –40 to 85 0.10 11 A3214ELHLT-T Yes A3214EUA – Bulk 500 pieces/bag SIP through hole A3214EUA-T Yes A3214LLHLT – 7-in. reel 3000 pieces/reel Surface Mount –40 to 150 A3214LLHLT-T Yes A3214LUA – Bulk 500 pieces/bag SIP through hole A3214LUA-T Yes *Contact Allegro for additional packing options.

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-50003 FUNCTIONAL BLOCK DIAGRAM Copyright © 2003 Allegro MicroSystems, Inc. Package Designator ‘UA’ Pinning (SIP) TIMING LOGIC Dwg. FH-020-5 LATCH GROUND OUTPUT SUPPLY X DYNAMIC OFFSET CANCELLATION SWITCH SAMPLE & HOLD Dwg. PH-016 SUPPLY VDD GROUND OUTPUT X Pinning is shown viewed from branded side. 600 400 200 20 60 100 140 AMBIENT TEMPERATURE in °°°°C ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS Dwg. GH-046-9 PACKAGE SUFFIX "UA" R θJA = 165°C/W 40 80 120 180 700 500 300 100 160 PACKAGE SUFFIX "LH" R θJA = 228°C/W 800 TEMP. CODE "E" TEMP. CODE "L" NOTE – Allowable package power dissipation will not be exceeded unless Absolute Maximum Ratings (page 1) are exceeded.

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES www.allegromicro.com 4 ELECTRICAL CHARACTERISTICS: unless otherwise noted over operating voltage and temperature range. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Operate Points B OPS South pole to branded side – 42 70 G BOPN North pole to branded side -70 -48 – G Release Points B RPS South pole to branded side 10 32 – G BRPN North pole to branded side – -38 -10 G Hysteresis B hys |BOPx - BRPx|– 1 0 – G NOTES: 1. As used here, negative flux densities are defined as less than zero (algebraic convention) and -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 = 3.0 V and is for design information only. 4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT). MAGNETIC CHARACTERISTICS: over operating voltage and temperature range. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage Range V DD Operating1) 2.4 3.0 5.5 V Output Leakage Current I OFF VOUT = 5.5 V, BRPN < B < BRPS – <1.0 1.0 µA Output On Voltage V OUT IOUT = 1 mA, VDD = 3.0 V – 100 300 mV Awake Time t awake –6 0 9 0 µ s Period t period A3213xx – 240 360 µs A3214xx – 60 90 ms Duty Cycle d.c. A3213xx – 25 – % A3214xx – 0.10 – % Chopping Frequency f C – 340 – kHz Supply Current I DD(EN) Chip awake (enabled) – – 2.0 mA IDD(DIS) Chip asleep (disabled) – – 8.0 µA IDD(AVG) A3213xx – 460 850 µA A3214xx – 11 22 µA ESD, Human Body Model – Per CDF-AEC-Q100-002 5.0 – – kV ESD, Machine Model – Per JESD22-A115 350 – – V NOTES: 1. Operate and release points will vary with supply voltage. 2. BOPx = operate point (output turns ON); BRPx = release point (output turns OFF). 3. Typical Data is at TA = +25°C and VDD = 3.0 V and is for design information only.

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-50005 TYPICAL OPERATING CHARACTERISTICS as a function of temperature (VDD = 3 V) A3213xx A3214xx TEMPERATURE, TA (°C) TEMPERATURE, TA (°C) SWITCH POINTS, B (G) AVG, SUPPLY CURRENT, IDD (µA) TEMPERATURE, TA (°C) OUTPUT ON VOLTAGE, V OUT (mV) TEMPERATURE, TA (°C) AVG, SUPPLY CURRENT, IDD (µA)

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES www.allegromicro.com 6 TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (TA = 25°C) A3213xx A3214xx SUPPLY VOLTAGE, VDD (V) SUPPLY VOLTAGE, VDD (V) SUPPLY VOLTAGE, VDD (V) SWITCH POINTS, B (G) AVG, SUPPLY CURRENT, IDD (µA) AVG, SUPPLY CURRENT, IDD (µA)

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-50007 FUNCTIONAL DESCRIPTION Low Average Power. Internal timing circuitry activates the sensor for 60 µs and deactivates it for the remainder of the period (240 µs for the A3213xx and 60 ms for the A3214xx). A short "awake" time allows for stabilization prior to the sensor 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. 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-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature depen- dencies, and thermal stress. The chopper-stabilizing technique cancels the mismatching of the resistor circuit by changing 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 tempera- ture cycling. This technique 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 Sensor Using Dynamic Quadrature Offset Cancellation and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator . Dwg. WH-017-1 PERIOD 60 µs - "AWAKE" "SLEEP"IDD(EN) IDD(DIS) SAMPLE & OUTPUT LATCHED Dwg. EH-012-1 SAMPLE & HOLD X HALL VOLTAGE B Dwg. AH-011-2 Operation. The output of this device switches low (turns on) when a magnetic field perpendicular to the Hall sensor exceeds the operate point BOPS (or is less than B OPN). After turn-on, the output is capable of sinking up to 1 mA and the output voltage is V OUT(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 mag- netic operate and release points is the hysteresis (B hys) 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.

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES www.allegromicro.com 8 SENSOR LOCATIONS Package Designator ‘LH’ Package Designator ‘UA’ OUTPUT Dwg. EH-013-20.1 µF SUPPLY (3 V BATTERY) 10 pF 50 kΩ X V DD 1 2 1 32 Dw g. MH-011-12 0.0195" 0.50 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.081" 2.07 mm 0.053" 1.33 mmA 0.046" 0.85 mm1 2 Dw g. MH-025-1 0.011" 0.28 mm NOM ACTIVE AREA DEPTH 0.059" 1.51 mm A Allegro Applications. Allegro's pole-independent sensing technique allows for operation with either a north pole or south pole magnet orientation, enhancing the manufacturability of the device. The state-of-the-art 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 sensor) 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. Extensive applications information on magnets and Hall-effect sensors is also available in the Allegro Electronic Data Book AMS-702 or Application Note 27701, or at www.allegromicro.com 0 +B Dwg. GH-043-1 OUTPUT ON 5 V MAX B OPS BRPS B OPN BRPN OUTPUT VOLTAGE MAGNETIC FLUX OUTPUT OFF

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-50009 PACKAGE DESIGNATOR ‘LH’ (SOT23W, fits SC-59A solder-pad layout) NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2.Exact body and lead configuration at vendor’s option within limits shown. 3.Height does not include mold gate flash. 4.Where no tolerance is specified, dimension is nominal. 5.Add "LT" to part number for tape and reel. Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) Dwg. MA-011-3 in 0.039 0.094 0.037 0.028 Dwg. MA-011-3 mm 1.00 2.40 0.95 0.70 Dwg. MA-010-3D in 0.006 0.000 0.0079 0.0050 0.083 0.073 0.118 0.106 0.037 BSC 0.022 REF 0.020 0.012 0.045 0.032 0° TO 8° 0.010 MIN GAUGE PLANE SEATING PLANE 0.010 BSC 0.122 0.114 Dwg. MA-010-3D mm 0.15 0.00 0.20 0.127 2.10 1.85 3.00 2.70 0.95 BSC 0.55 REF 0.50 0.30 1.13 0.87 0° TO 8° 0.25 MIN GAUGE PLANE SEATING PLANE 0.25 BSC 3.10 2.90

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES www.allegromicro.com 10 Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) PACKAGE DESIGNATOR ‘UA’ NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2.Exact body and lead configuration at vendor’s option within limits shown. 3.Height does not include mold gate flash. 4.Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). 5.Where no tolerance is specified, dimension is nominal. 6.Supplied in bulk pack (500 pieces per bag). Dwg. MH-014E in 0.164 0.159 0.062 0.058 0.0173 0.0138 0.050 BSC 45° 0.640 0.600 0.0189 0.0142 0.085 MAX 45° 0.031123 0.122 0.117 SEE NOTE Dwg. MH-014E mm 4.17 4.04 1.57 1.47 0.44 0.35 1.27 BSC 45° 16.26 15.24 0.48 0.36 2.16 MAX 45° 0.791 2 3 3.10 2.97 SEE NOTE Radial Lead Form (order A321xxUA-LC) NOTE: Lead-form dimensions are the nominals produced on the forming equipment. No dimensional tolerance is implied or guaranteed for bulk packaging (500 pieces per bag). 0.620" 0.500" (15.7 mm 12.7 mm) 0.100" (2.5 mm) Dwg. MH-026 0.108" (2.74 mm) 123

MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-500011 The products described herein are manufactured under one or more of the following U.S. patents: 4,761,569; 5,619,137; 5,621,319. In addition, a patent is pending for Allegro's magnetic pole-independent feature. Allegro has several foreign counterpart patents as well. Allegro has not licensed any of these patents to any third party. Allegro MicroSystems, Inc. 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 products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibil- ity for its use; nor for any infringements of patents or other rights of third parties that may result from its use.