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ATS635LSE and ATS636LSE
Programmable Back Biased Hall-Effect Switch with TPOS Functionality
PACKAGE DIAGRAM
The ATS635LSE and ATS636LSE programmable, true power-on state (TPOS), sensors are an optimized Hall-effect IC and magnet combination that switch in response to magnetic signals created by ferrous targets in gear-tooth sensing and proximity applications. The devices are externally programmable. A wide range of programmability is available on the magnetic operate point (BOP) while the hysteresis remains fixed. This advanced feature allows for optimization of the sensor switch point and can drastically reduce the effects of mechanical placement tolerances found in production environments . A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependencies, and thermal stress. Having the Hall element and amplifier in a single chip minimizes many problems normally associated with low-level analog signals. This sensor system is ideal for use in gathering speed or position information using gear-tooth-based configurations, or for proximity sensing with ferrous targets. The ATS635LSE switches HIGH in the presence of a ferrous target or tooth and switches LOW in the presence of a target valley, window, or when the ferrous target is removed. The ATS636LSE has the opposite polarity and switches LOW in the presence of a ferrous target or tooth and switches HIGH in the presence of a target valley, window, or when the ferrous target is removed. These devices are available in lead (Pb) free versions, with 100% matte tin leadframe plating.
Pin 1 = VCC Pin 2 = VOUT Pin 3 = No Connect Pin 4 = GND
FEATURES
Chopper Stabilization Extremely low switch-point drift over temperature On-chip Protection Supply transient protection Output short-circuit protection Reverse-battery protection True Zero-Speed Operation True Power-On State Single-chip Sensing IC for High Reliability Optimized Magnetic Circuit Wide Operating Voltage Range Internal Regulator
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .............................. 28 V* Reverse Supply Voltage, VRCC ............... -18 V Overvoltage Supply Current, ICC ...........100 mA Output Off Voltage, VOUT........................ 26.5V Output Sink Current, IOUT................... 20 mA Magnetic Flux Density, B............... Unlimited Package Power Dissipation, PD ..... See Graph Operating Temperature Range, TA Suffix "L"....................... -40 C to +150 C Junction Temperature, TJ ......................165 C Storage Temperature Range TS .............................. -65 C to +170 C
*Fault conditions that produce supply voltage transients will be clamped by an internal Zener diode. These conditions can be tolerated but should be avoided. Internal current limiting is intended to protect the device from output short circuits, but is not intended for continuous operation.
Use the following complete part numbers when ordering:
Part Number ATS635LSETN-T ATS636LSETN-T Pb-Free Yes Yes Output (Tooth) High Low Packing* 13-in. reel, 450 pieces/reel 13-in. reel, 450 pieces/reel
*Contact Allegro for additional packing options.
ATS635LSE-DS
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
CHARACTERISTICS
ELECTRICAL CHARACTERISTICS over operating voltage and junction temperature range (unless otherwise noted)
Characteristics Supply Voltage
1
Symbol VCC POS VOUT(SAT)
Test Conditions Operating After programming VCC = 0 a VCC(min), t > t ON : B < BOP ATS636 B < BOP ATS635 Output on, IOUT = 20 mA Pulse test method Output on Output off, VOUT = 24 V Output off (HIGH) Output on (LOW) VRCC = -18V Output off; VCC > VCC(min) RL = 820 , CL = 10 pF RL = 820 , CL = 10 pF ICC = ICC(max) + 3 mA TA = 25C IOUT = 3 mA TA = 25C VS = 28 V VO = 30 V
Limits Min. 4.2 HIGH LOW - 30 - - - - - - - - 28 30 - - Typ. - HIGH LOW 175 50 - 2.5 2.5 - 35 1.2 1.2 250 - - - - Max. 24 HIGH LOW 400 90 10 5.5 5.5 -5 50 5 5 - -
8.5 3
Units V - - mV mA A mA mA mA s s s kHz V V mA mA
Power-Up State Low Output Voltage Output Current Limit
2
IOUTM IOFF ICC IRCC tON tr tf fSample VZsupply VZOutput
4
Output Leakage Current Supply Current Reverse Supply Current Power-On Delay
3
Output Rise Time Output Fall Time Sampling Frequency Supply Zener Voltage Output Zener Voltage Supply Zener Current Output Zener Current
IZsupply IZOutput
Note: Typical data is at VCC = 12 V and TA = +25C.
1 2
Do not exceed the maximum thermal junction temperature: see power de-rating curve. Short circuit protection is not intended for continuous operation and is tested using pulses. 3 The power on delay is the time that is necessary before the output signal is valid 4 The maximum spec limit for this parameter is equivalent to ICC(max) + 3 mA
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
Page 2 of 15
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES MAGNETIC CHARACTERISTICS over operating voltage and junction temperature range using reference target (Unless otherwise noted)
Limits Characteristics Number of Programming Bits Symbol Test Conditions Switch Point Switch Point Polarity Programming Lock Temp: 25C Temp: 25C Code -127 Code +127 Min. - - - 2.5 - - - - - - - Typ. 7 1 1 - - 0.05 0.2 HIGH LOW LOW HIGH Max. - - - - 1.5 - - - - - - Units Bit Bit Bit mm mm mm mm - - - -
ATS635LSE and ATS636LSE
Gear Tooth Sensor / Proximity Sensing Characteristics (Low Switchpoint Only)
1
Programming Air Gap Range Programming Resolution
2
AGRange AGRes AGDrift
Air Gap Drift Over Full Temperature Range
Temperature: 25C Program Air Gap = 2.5 mm Device Programmed to 2.5 mm Over Tooth (ATS635LSE) Over Valley (ATS635LSE) Over Tooth (ATS636LSE) Over Valley (ATS636LSE)
Polarity
P
Reference Target Flux Density vs. Position 1400 1200 Flux Density (Gauss) 1000 800 600 400 200 0 0 30 60 90 120 150 180 210 240 270 300 330 360 Position ()
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00
1400 1200
Tooth and Valley Field vs. Air Gap Reference Target
Reference Target Tooth Reference Target Valley
Flux Density [Gauss]
1000 800 600 400 200 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Air Gap [mm]
Reference Target Flux Density vs. Position: Typical
Reference Target Tooth and Valley Field vs. Air Gap
1
The switch point will vary over temperature. A sufficient margin obtained through customer testing is required to guarantee functionality over temperature. Programming at larger air gaps leaves no safety margin for switchpoint drift. See the applications note: "Proximity Sensing Programming Technique" http://www.allegromicro.com/techpub2/proximity_sensing/ or visit the Allegro website at http://www.allegromicro.com for additional information. 2 The switch point will vary over temperature, proportionally to the programmed air gap. This parameter is based on characterization data and is not a tested parameter in production. Switch point air gap generally drifts downward as temperature increases.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES REFERENCE TARGET DIMENSIONS
Target Reference Target Outside Diameter (Do ) 120mm Face Width (F) 6mm Circular Tooth Length (T) 23.5mm Circular Valley Length (P C - T) 23.5mm Tooth Whole Depth (ht) 5mm
ATS635LSE and ATS636LSE
Reference Target
Reference Target
GEAR PARAMETERS FOR CORRECT OPERATION
Characteristic Tooth Whole Depth (ht ) Circular Valley Length (P C - T) Circular Tooth Length (T) Face Width (F) Description Depth of Target Valley Length of Target Valley Length of Target Tooth Thickness or Width of Target Tooth Min. 5 13 5 5 Limits Typ. Max. - - - - - - - - Units mm mm mm mm
MATERIAL: CRS 1018
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
ELECTROMAGNETC CAPABILITY (EMC) PERFORMANCE
Please contact Allegro MicroSystems for EMC performance Test Name
ESD - Human Body Model ESD - Machine Model Conducted Transients Direct RF Injection Bulk Current Injection TEM Cell
Reference Specification
AEC-Q100-002 AEC-Q100-003 ISO 7637-1 ISO 11452-7 ISO 11452-4 ISO 11452-3
FUNCTIONAL BLOCK DIAGRAM
VCC Program / Lock Reg Programmming Logic Offset Adjust OUT AMP S/H LPF Current Limit To all subcircuits
Clock/Logic GND
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
Chopper-Stabilized Technique. The basic Hall sensor is a small sheet of semiconductor material in which a constant bias current will flow when a constant voltage source is applied. The output will take the form of a voltage measured across the width of the sheet and will have negligible value in the absence of a magnetic field. When a magnetic field with flux lines at right angles to the Hall current is applied, a small signal voltage directly proportional to the strength of the magnetic field will occur at the output terminals. This signal voltage is proportionally small relative to the offset produced at the input of the chip. This makes it very difficult to process the signal and maintain an accurate, reliable output over the specified temperature and voltage range. Therefore, it is important to reduce any offset on the signal that could be amplified when the signal is processed.
FUNCTIONAL DESCRIPTION
signal in the frequency domain. The offset (and any low frequency noise) component of the signal can be seen as signal corruption added after the signal modulation process has taken place. Therefore, the DC offset is not modulated and remains a low frequency component. Consequently, the signal demodulation process acts as a modulation process for the offset causing the magnetically induced signal to recover its original spectrum at baseband while the DC offset becomes a high frequency signal. Then, using a low pass filter the signal passes while the modulated DC offset is suppressed. The advantage of this approach is significant offset reduction, which de-sensitizes the chip against the effects of temperature and stress. The disadvantage is that this technique features a demodulator that uses a sample and hold block to store and recover the signal. This sampling process can slightly degrade the Signalto-Noise Ratio (SNR) by producing replicas of the noise spectrum at the baseband. The degradation is a function of the ratio between the white noise spectrum and the sampling frequency. The effect of the degradation of the SNR is higher jitter, a.k.a. signal repeatability. In comparison to a continuous time device, the jitter spec can be increased by a factor of five.
Chopper Stabilization is a unique approach used to minimize input offset on the chip. This technique removes a key source of output drift with temperature and stress, and produces a 3X reduction in offset over other conventional methods. This offset reduction Chopping Technique is based on a signal modulation-demodulation process. The undesired offset signal is separated from the magnetically induced
Regulator
Amplifier
Sample/ Hold
CLOCK
Hall Element
Figure 1 - Concept of Chopper-Stabilization Algorithm
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
FUNCTION DESCRIPTION: ADDRESSING / PROGRAMMING PROTOCOL
The ATS635LSE and ATS636LSE magnetic operate point (B OP) is programmed by serially addressing the devices through the supply terminal (1). After the correct operate point is determined, the device programming bits are selected and blown, then a lock bit is selected and blown to prevent any further (accidental) programming. Addressing: Bop is programmable in both the positive and negative direction from its initial value. Addressing is used to determine the desired code, while programming is used to lock the code. A unique key is needed to blow fuses, while addressing as described below does not allow for the device to be programmed accidentally. Addressing with positive polarity. The magnetic operate point (B OP) is adjustable using 7 bits or 128 addresses. The Addresses are sequentially selected (Figure 2) until the required operate point is reached. The first address must be selected with a High voltage pulse (V PP), while the remaining pulses should be VPH Pulses. Note that the difference between BOP and the magnetic release point (B RP), the Hysteresis (B HYS), is fixed for all addresses.
Code 1
VPP V PH VPL 0
t d(1)
td(0)
Figure 2 - Addressing Pulses: Positive Polarity Addressing with negative polarity. The magnetic operate point (B OP) is adjustable with negative polarity using 7 bits or 128 addresses. To invert the polarity it is necessary to first apply a keying sequence (Figure 3). Th e polarity key contains a VPP pulse and at least 1 VPH pulse, but no more than 6 VPH pulses; the key in Figure 3 shows 2 VPH pulses. The addresses are then sequentially selected until the required operate point is reached. The first address must be selected with a High voltage pulse (V PP), while the remaining pulses should be VPH Pulses.
Polarity Key
Code -1
Code -(N-2)
Code -(N-1)
VPP VPH VPL 0
td(1)
td(0)
Figure 3 - Addressing Pulses: Negative Polarity
Page 7 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
Code -N (Up to -127)
Code -2
Code -3
Code N (Up to 127)
Code N-2
Code 2
Code 3
Code N-1
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
Program Enable. To program the device, a keying sequence is used to activate / enable the programming mode as shown in Figure 4. This program key sequence consisting of a VPP pulse, at least seven VPH pulses, and a VPP pulse with no supply interruptions. The sequence is designed to prevent the device from being programmed accidentally (e.g., as a result of noise on the supply line).
ATS635LSE and ATS636LSE
VPP V PH VPL 0 td(1) td(1)
PROGRAM ENABLE 7 or More Pulses (8 Pulses Shown)
td(0)
Figure 4 - Program Enable Pulse Sequence Code Programming. After the desired switch point code is selected (0 through 127), each bit of the corresponding binary address should be programmed individually, not at the same time. For example, to program code 5 (binary 000101), bits 1 and 3 need to be programmed. A bit is programmed by addressing the code and then applying a VPP pulse, the programming is not reversible. An appropriate sequence for blowing code 5 is shown in Figure 5.
Bit 3 Program Bit 1 Program
VPP VPH VPL
0
Program Enable
Bit 3 Address 000100 Code 4
Program Enable
td(1)
td(1)
td(0)
tdP
000001 Code 1
Figure 5 - Code Programming Example Polarity Bit Programming. If the desired switchpoint has negative polarity, the polarity bit must be programmed. To do this it is necessary to first apply the polarity key sequence before the program key sequence (Figure 6). Finally a VPP pulse of duration tdP must be applied to program this bit, the programming is not reversible. The polarity bit is for adjusting programming range only and will not affect the output polarity. The proper output polarity device is determined by ordering the correct part number (ATS635 or ATS636), as they are different ICs.
Polarity Key Polarity Bit Program
VPP VPH VPL
0
Program Enable td(1) td(1) td(0)
tdP
Figure 6 - Polarity Bit Programming
Page 8 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
Bit 1 Address
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
Lock-Bit Programming. After the desired code is programmed, the lock bit (code 128), can be programmed (figure 7) to prevent further programming of the device. Again; programming is not reversible.
Lock Bit Program tdP
ATS635LSE and ATS636LSE
VP P V PH VP L
0
Program Enable t d(1) t d(1) t d(0)
Lock Bit Address 128 Pulses
Figure 7 - Lock -Bit Programming Pulse Sequence See Allegro website at http://www.allegromicro.com for extensive information on device programming as well as programming products. Programming hardware is available for purchase and programming software is available for free.
Valid over operating temperature range unless otherwise noted.
Part Number Characteristics Symbol Test Conditions Min. PROGRAMMING PROTOCOL (T A = +25C) VPL
5,6
Limits Typ. Max. Units
Programming Voltage
Minimum voltage range during programming
4.5 8.5 25
5 - - 500 - - 300 - -
5.5 15 27 - - - - 11 5
V V V mA s s s s s
VPH VPP Maximum supply current during programming OFF time between bits Enable, address, program, or lock bit ON time Program pulse ON time VPL to VPH or VPP VPH or VPP to VPL
ATS635 / ATS636
Programming Current
IPP td(0)
- 20 20 100 - -
Pulsewidth
td(1) tdP
Pulse Rise Time Pulse Fall Time
tr tf
5
Programming Voltages are measured at Pin 1 (VCC) of SIP. A minimum capacitance of 0.1 F must be connected from VCC to GND of the SIP to provide the current necessary to blow the fuse. 6 Testing is the only method that guarantees successful programming.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
Page 9 of 15
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
FUNCTIONAL DESCRIPTION (CONT.): TYPICAL APPLICATION CIRCUIT
Applications. It is strongly recommended that an external ceramic bypass capacitor in the range of 0.01 F to 0.1 F be connected between the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique. (The diagram below shows a 0.1 F bypass capacitor.) The series resistor RS in combination with the bypass capacitor creates a filter for EMC pulses. The series resistor will have a drop of approximately 800 mV, this must be considered for the minimum VCC requirement of the ATS635LSE / ATS636LSE. The small capacitor on the output of the device improves the EMC performance of the device. The pull-up resistor should be chosen to limit the current through the output transistor; do not exceed the maximum continuous output current of the device. Note: This circuit cannot be used to program the device, as the series resistance is too large, and a minimum capacitance of 0.1 F must be connected from VCC to GND of the SIP to provide the current necessary to blow the fuse.
Typical Application:
RS
100 Ohm
5V 1 VCC ATS635/636
RL
1.2k Ohm
VSupply
0.1 F
2 VOUT
120 pF
GND
4
Extensive applications information on magnets and Hall-effect sensors including Chopper-Stabilization is available in the Allegro Electronic Data Book CD, or at the website: http://www.allegromicro.com .
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE CHARACTERISTIC DATA
Data taken from 3 lots, 30 pieces/lot Reference Target 8x
ICC ON 6
I CC OFF 6
5
5
4
4 ICC (mA)
4V 15V 24V
I CC (mA)
3
3 4V 15V 24V
2
2
1
1
0 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
0 -50
-25
0
25
50
75
100
125
150
175
TEMPERATURE (C)
V SAT 500
400
VSAT (mV)
300
200 20mA 100
0 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
Page 11 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
CHARACTERISTIC DATA (continued)
Data taken from 3 lots, 30 pieces/lot Reference Target 8x
B OP/BRP vs. Program Code 7 6 5 AIR GAP (mm) 4 3 2 1 0 -50 0 50 100 150 200 TEMPERATURE (C)
Code -8 BOP Code -8 BRP Code Code 0 0 BOP BRP
Code +32 BOP Code +32 BRP Code +127 BOP Code +127 BRP
Notes: s Air gaps for Code 127 @ 150C are interpolated due to test limitations at minimum air gap. s These graphs are intended to provide an understanding of how the program codes affect the switch points. In a production environment, individual devices would be programmed to individual codes to ensure all devices switch at the same air gap.
Page 12 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
POWER DE-RATING - SE Package
Power De -Rating Due to internal power consumption, the temperature of the IC (junction temperature, TJ ) is higher than the ambient environment temperature, TA . To ensure that the device does not operate above the maximum rated junction temperature use the following calculations:
Power Dissipation, PD (m W)
Power Dissipation versus Ambient Temperature
4500 4000 3500 3000 2500 2000 1500 1000 500 0 20
2-layer PCB (RJA = 77 C/W)
T=PD x RJA Where PD = VCC x ICC T = VCC x ICC x RJA Where T denotes the temperature rise resulting from the IC's power dissipation: TJ = TA + T RJA = 77C/W T J(max) = 165C Typical T J Calculation: TA = 25C, VCC = 5 V, ICC(on) = 5.5 mA PD = VCC x ICC PD = 5 V x 5.5 mA = 27.5 mW T = PD x RJA = 27.5 mW x 77C/W = 2.0 TJ = TA + T = 25C + 2.0C = 27.0C Maximum Allowable Power Dissipation Calculation TJ = TA + T TJ(max) = 165C, if TA = 150C then: 165 = 150 + T T = 15C DT = PD x RJA (RJA = 77C/W) \ P D(max) = 15C / 77C/W = 1 95 mW @ TA = 150C Maximum V CC for P D(max) =111 mW at T A =150C PD = VCC x ICC ICC = 10mA (max) at 150C VCC = PD / ICC = 195 mW / 5.5 mA = 35.4 V
40
60
80 100 120 Temperature (C)
140
160
180
Page 13 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE SE PACKAGE DIMENSIONS
Reference Dimensions Only
7 .276
10
.394
C
B
3.3 .130
E
6.2 .244
4.9
.193
1.3
.051
A
0.38 .015
1.08 .043
20.95 .825 11.6 .457
1
2
3
4
A
D
0.6 .240 1.27 .050 2 .079 Preliminary dimensions, for reference only Untoleranced dimensions are nominal. Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only Dimensions exclusive of mold flash, burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Dambar removal protrusion (16X)
B Metallic protrusion, electrically connected to pin 4 and substrate (both sides) C Active Area Depth, 0.43 mm [.017] D Thermoplastic Molded Lead Bar for alignment during shipment E Hall element (not to scale)
Page 14 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ATS635LSE and ATS636LSE
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; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,719,130; 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 design 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 applications, 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 which may result from its use.
Page 15 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2005 Allegro MicroSystems, Inc.

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