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— For referenc e only Use A3212 or A3213 for new design. The A3209Ex and A3210Ex 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 s uch as cellular and cordless telephones , pagers, and palmtop computers. 2. 5 volt to 3.5 volt operation and a unique clocking scheme to reduce the average operat- ing power requirements – the A3209Ex to 400 µW, the A3210Ex to 25 µW! Except for operating duty cycle and average operating current, the A 3209Ex and A3210Ex 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 eas e of manufacturing, while eliminating the requirement for s ignal 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. The A3209Ex and A3210Ex are rated for operation over a temperature range of -40°C to +85°C. Two package styles provide a magnetically opti- mized package for most applications. Suffix ‘LH’ is a miniature low-profile surface-mount package while suffix ‘UA’ is a three-lead ultra-mini-SIP for through-hole or surface mounting.
FEATURES
■ Micropower Operation ■ Operate With North or South Pole ■ 2.5 V to 3.5 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 teehS ataD C06.22672 Always order by complete part number: the prefix ‘A’ + the basic four-digit part number + the suffix ‘E’ to indicate operating temperature range + a suffix to indicate package style, e.g., A3210ELH . Package Suffix ‘LH’ Pinning (SOT23W)
3209 AND
at TA = +25°C Operating Temperature Range, Storage Temperature Range, Caution: These CMOS devices have input static protection (Class 3) but are still susceptible to damage if exposed to extremely high static electrical charges. Pinning is shown viewed from branded side. MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES X Dwg. PH-016-1 SUPPLY GROUND OUTPUT VDD 1 2
3209 AND 3210
MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-50002 FUNCTIONAL BLOCK DIAGRAM Copyright © 2000, 2003 Allegro MicroSystems, Inc. Package Suffix ‘UA’ Pinning (ultra-mini 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-046-3B Suffix "UA" R θJA = 165°C/W 40 80 120 180 700 500 300 100 160 Suffix "LH" R θJA = 228°C/W 800
MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES www.allegromicro.com 3 ELECTRICAL CHARACTERISTICS with CBYPASS = 0.1 µF, over operating voltage and temperature range (unless otherwise specified). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Operate Points B OPS South pole to branded side – 30 60 G BOPN North pole to branded side -60 -35 – G Release Points B RPS South pole to branded side 5.0 22 – G BRPN North pole to branded side – -27 -5.0 G Hysteresis B hys |BOPx - BRPx| – 7.7 – 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. Typical Data is at T A = +25°C and VDD = 2.75 V and is for design information only. MAGNETIC CHARACTERISTICS with CBYPASS = 0.1 µF, over operating voltage and temperature range (unless otherwise specified). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage Range V DD Operating1) 2.5 2.75 3.5 V Output Leakage Current I OFF VOUT = 3.5 V, BRPN < B < BRPS – «1.0 1.0 µA Output On Voltage V OUT IOUT = 1 mA, VDD = 2.5 V – 105 300 mV Awake Time t awake 30 60 90 µs Period t period A3209Ex 240 480 720 µs A3210Ex 30 60 90 ms Duty Cycle d.c. A3209Ex – 12.5 – % A3210Ex – 0.10 – % Chopping Frequency f C – 340 – kHz Supply Current I DD(EN) Chip awake (enabled)0.1 – 3.0 mA (2.5 ≤ VDD ≤3.5 V) IDD(DIS) Chip asleep (disabled)1.0 10 50 µA IDD(AVG) A3209Ex, VDD = 2.75 V – 145 425 µA A3209Ex, VDD = 3.5 V – 195 425 µA A3210Ex, VDD = 2.75 V – 8.8 25 µA A3210Ex, VDD = 3.5 V – 13 60 µA NOTES: 1. Operate and release points will vary with supply voltage. 2. BOPx = operate point (output turns ON); B RPx = release point (output turns OFF). 3. Typical Data is at T A = +25°C and VDD = 2.75 V and is for design information only.
MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-50004 TYPICAL OPERATING CHARACTERISTICS as a function of temperature A3210-- SUPPLY CURRENT SWITCH POINTS SWITCH POINTS IN GAUSS -20 -40 0 25 50 75 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-027-2 -25 BOPS -60 BRPS BRPN BOPN VDD = 2.75 V AVERAGE SUPPLY CURRENT IN µµµµA 8.0 6.0 0 25 50 75 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-028-6 -25 VDD = 3.5 V VDD = 2.5 V VDD = 3 V A3209-- SUPPLY CURRENT
220 AVERAGE SUPPLY CURRENT IN µµµµA
AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-028-7 -25 VDD = 3.5 V VDD = 3 V 200 VDD = 2.5 V
MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES www.allegromicro.com 5 SWITCH POINTS A3210-- SUPPLY CURRENT SWITCH POINTS IN GAUSS -20 -40 SUPPLY VOLTAGE IN VOLTS 2.4 Dwg. GH-057-1 2.6 BOPS -60 BRPS BRPN BOPN TA = 25°C AVERAGE SUPPLY CURRENT IN µµµµA 8.0 6.0 SUPPLY VOLTAGE IN VOLTS 2.4 Dwg. GH-058-5A 2.6 TA = 25°C TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage A3209-- SUPPLY CURRENT 220 AVERAGE SUPPLY CURRENT IN µµµµA 180 160 140 120 SUPPLY VOLTAGE IN VOLTS 2.4 Dwg. GH-058-6 2.6 200 TA = 25°C
MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-50006 FUNCTIONAL DESCRIPTION Low Average Power. Internal timing circuitry activates the device for 60 µs and deactivates it for the remainder of the period (480 µs for the A3209Ex and 60 ms for the A3210Ex). 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 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 offs et 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 dependen- cies, 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 us ing 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. 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 H all 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 (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 7 ELEMENT 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 Dwg. MH-011-11A 0.0195" 0.50 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.081" 2.06 mm 0.057" 1.45 mm A 0.038" 0.96 mm 1 2 Dwg. MH-025 0.011" 0.28 mm NOM ACTIVE AREA DEPTH 0.059" 1.49 mm A Allegro Applications. Allegro's pole-independent s ensing technique allows for operation with either a north pole or s outh 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 cap aci- tor 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-s tabilization tech- nique. This is especially true due to the relatively high imped- ance 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 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 BOPS BRPS B OPN BRPN OUTPUT VOLTAGE MAGNETIC FLUX OUTPUT OFF
MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Worcester, Massachusetts 01615-0036 (508) 853-50008 PACKAGE DESIGNATOR ‘LH’ (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. 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 9 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° 0.79123 3.10 2.97 SEE NOTE Radial Lead Form (order A32xxEUA-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) 853-500010 The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. 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 responsi- bility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.