Data Sheet 27622.62F 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Package Designator ‘LH’ Pinning (SOT23W) 3 V DD OUTPUT 2 GROUND SUPPLY 1 Dwg. PH-016-1 Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25°C Supply Voltage, VDD .............................. 6 V Magnetic Flux Density, B .......... Unlimited Output Off Voltage, VOUT ...................... 6 V Output Current, IOUT ........................... 1 mA Junction Temperature, TJ ................ +170°C Operating Temperature Range, TA Suffix 'E' ...................... -40°C to +85°C Suffix 'L' ................... -40°C to +150°C Storage Temperature Range, TS .............................. -65°C to +170°C Caution: These CMOS devices have input static protection (Class 3) but are still susceptible to damage if exposed to extremely high static electrical charges. The A3213xx and A3214xx 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 cellular and cordless telephones, pagers, and palmtop computers. A 2.4 volt to 5.5 volt operation and a unique clocking scheme reduce the average operating 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 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 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. 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. Range 'E' devices are rated for operation over a temperature range of -40°C to +85°C; range 'L' devices are rated for operation over a temperature range of -40°C to +150°C. Two package styles provide a magnetically optimized package for most applications. ‘LH’ is a miniature low-profile surfacemount 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 ■ Solid-State Reliability ■ Small Size ■ Easily Manufacturable With Magnet Pole Independence 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Product Selection Guide Part Number A3213ELHLT A3213ELHLT-T A3213EUA Pb-free Packing* Mounting – 7-in. reel 3000 pieces/reel Surface Mount Bulk 500 pieces/bag SIP through hole 7-in. reel 3000 pieces/reel Surface Mount Bulk 500 pieces/bag SIP through hole 7-in. reel 3000 pieces/reel Surface Mount Bulk 500 pieces/bag SIP through hole 7-in. reel 3000 pieces/reel Surface Mount Bulk 500 pieces/bag SIP through hole Yes – A3213EUA-T Yes A3213LLHLT – A3213LLHLT-T A3213LUA A3213LUA-T A3214ELHLT A3214ELHLT-T A3214EUA Yes – Yes – Yes – A3214EUA-T Yes A3214LLHLT – A3214LLHLT-T A3214LUA A3214LUA-T Yes – Yes Ambient, TA (ºC) IDDAVG(TYP) (µA) 25 460 0.10 11 –40 to 85 –40 to 150 –40 to 85 –40 to 150 *Contact Allegro for additional packing options. 2 DC (%) 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES FUNCTIONAL BLOCK DIAGRAM SUPPLY SWITCH LATCH X OUTPUT SAMPLE & HOLD DYNAMIC OFFSET CANCELLATION TIMING LOGIC GROUND Dwg. FH-020-5 Package Designator ‘UA’ Pinning (SIP) 700 PACKAGE SUFFIX "UA" RθJA = 165°C/W X 600 500 PACKAGE SUFFIX "LH" RθJA = 228°C/W 400 V DD 1 2 GROUND 300 SUPPLY TEMP. CODE "E" 100 TEMP. CODE "L" 0 20 40 60 80 120 100 AMBIENT TEMPERATURE in °C 140 160 180 Dwg. GH-046-9 NOTE – Allowable package power dissipation will not be exceeded unless Absolute Maximum Ratings (page 1) are exceeded. 3 3 200 OUTPUT ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS 800 Dwg. PH-016 Pinning is shown viewed from branded side. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2003 Allegro MicroSystems, Inc. 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES ELECTRICAL CHARACTERISTICS: unless otherwise noted over operating voltage and temperature range. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units 2.4 3.0 5.5 V Supply Voltage Range VDD Operating1) Output Leakage Current IOFF VOUT = 5.5 V, BRPN < B < BRPS – <1.0 1.0 µA Output On Voltage VOUT IOUT = 1 mA, VDD = 3.0 V – 100 300 mV Awake Time tawake – 60 90 µs Period tperiod A3213xx – 240 360 µs A3214xx – 60 90 ms A3213xx – 25 – % A3214xx – 0.10 – % – 340 – kHz Duty Cycle Chopping Frequency Supply Current d.c. fC IDD(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. MAGNETIC CHARACTERISTICS: over operating voltage and temperature range. Limits Characteristic Symbol Operate Points BOPS Release Points Hysteresis Test Conditions Min. Typ. Max. Units South pole to branded side – 42 70 G BOPN North pole to branded side -70 -48 – G BRPS South pole to branded side 10 32 – G BRPN North pole to branded side – -38 -10 G Bhys |BOPx - BRPx| – 10 – 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). www.allegromicro.com 4 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES SWITCH POINTS, B (G) TYPICAL OPERATING CHARACTERISTICS as a function of temperature (VDD = 3 V) TEMPERATURE, TA (°C) A3214xx AVG, SUPPLY CURRENT, IDD (µA) AVG, SUPPLY CURRENT, IDD (µA) A3213xx TEMPERATURE, TA (°C) OUTPUT ON VOLTAGE, VOUT (mV) TEMPERATURE, TA (°C) TEMPERATURE, TA (°C) 5 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES SWITCH POINTS, B (G) TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (TA = 25°C) SUPPLY VOLTAGE, VDD (V) A3214xx AVG, SUPPLY CURRENT, IDD (µA) AVG, SUPPLY CURRENT, IDD (µA) A3213xx SUPPLY VOLTAGE, VDD (V) www.allegromicro.com SUPPLY VOLTAGE, VDD (V) 6 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES FUNCTIONAL DESCRIPTION +V SAMPLE & HOLD 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. X PERIOD 60 µs - "AWAKE" IDD(EN) "SLEEP" SAMPLE & OUTPUT LATCHED Dwg. EH-012-1 IDD(DIS) 0 Dwg. WH-017-1 B +V 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 dependencies, 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 temperature 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. 7 — HALL VOLTAGE + 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 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Allegro SENSOR LOCATIONS OUTPUT OFF 5V MAX B OPS OUTPUT VOLTAGE B OPN Package Designator ‘LH’ ACTIVE AREA DEPTH 0.011" 0.28 mm NOM BRPS BRPN 3 0.046" 0.85 mm OUTPUT ON 0 0 -B 0.059" 1.51 mm A +B MAGNETIC FLUX Dwg. GH-043-1 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 1 2 Dwg. MH-025-1 Package Designator ‘UA’ ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.081" 2.07 mm 0.053" 1.33 mm A BRANDED SURFACE 1 2 3 www.allegromicro.com Dwg. MH-011-12 2 OUTPUT SUPPLY (3 V BATTERY) 1 X V DD 3 50 kΩ 10 pF 0.1 µF www.allegromicro.com Dwg. EH-013-2 8 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES PACKAGE DESIGNATOR ‘LH’ (SOT23W, fits SC-59A solder-pad layout) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) 3.10 2.90 0.122 0.114 0.50 0.30 0.020 0.012 0.083 0.073 3 1 2 0.118 0.106 2.10 1.85 0.010 BSC 3 1 2 3.00 2.70 SEATING PLANE REF 0° TO 8° 0.037 0.006 0.000 SEATING PLANE 0.55 0.010 REF 0.045 0.032 0° TO 8° 0.95 MIN BSC BSC GAUGE PLANE GAUGE PLANE 0.022 0.25 MIN BSC 0.0079 0.0050 0.15 0.00 0.20 0.127 1.13 0.87 Dwg. MA-010-3D in Dwg. MA-010-3D mm 0.028 0.70 3 3 1.00 0.039 2.40 0.094 1 1 2 2 0.95 0.037 Dwg. MA-011-3 mm Dwg. MA-011-3 in 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. 9 0.25 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES PACKAGE DESIGNATOR ‘UA’ Dimensions in Millimeters (for reference only) Dimensions in Inches (controlling dimensions) 4.17 4.04 0.164 0.159 0.062 0.058 45° 1.57 1.47 45° 3.10 2.97 0.122 0.117 45° 45° 0.085 1 2 3 0.031 2.16 1 2 0.79 3 MAX MAX 0.640 0.600 16.26 15.24 0.0173 0.0138 0.0189 0.0142 SEE NOTE 0.44 0.35 0.48 0.36 SEE NOTE 1.27 0.050 BSC BSC Dwg. MH-014E in Dwg. MH-014E mm Radial Lead Form (order A321xxUA-LC) 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). 1 2 3 0.108" (2.74 mm) 0.620" 0.500" (15.7 mm 12.7 mm) 0.100" (2.5 mm) Dwg. MH-026 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). www.allegromicro.com 10 3213 AND 3214 MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES 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 responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use. 11 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000