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3150
PROGRAMMABLE, CHOPPERSTABILIZED, HALL-EFFECT SWITCH
The A3150JLT and A3150JUA programmable switches provide tooth/valley recognition in large gear-tooth sensing applications. Each sensor consists of a single element, chopper-stabilized Hall-effect IC that can be programmed to the desired magnetic switch point, optimizing sensor airgap and timing accuracy performance after final packaging. The small package can be easily assembled and used in conjunction with a wide variety of gear/target shapes and sizes. The two devices differ only in package style. The sensing technology used for this sensor is Hall-effect based. The sensor incorporates a single-element Hall IC that switches in response to magnetic signals created by a ferrous target. The programmability of the circuit eliminates magnet and system offsets such as those caused by tilt yet provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions. A proprietary dynamic offset cancelation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependancies, and thermal stress. This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Many problems normally associated with low-level analog signals are minimized by having the Hall element and amplifier in a single chip. Output precision is obtained by internal gain adjustments during the manufacturing process and operate-point programming in the user's application. This sensor system is ideal for use in gathering speed, position, and timing information using gear-tooth-based configurations. The A3150JLT/JUA are particularly suited to those applications that require accurate duty cycle control or accurate edge detection. The lower vibration sensitivity also makes these devices extremely useful for transmission speed sensing.
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Data Sheet 27621.40
X
PTCT
PRELIMINARY INFORMATION
(subject to change without notice)
ABSOLUTE MAXIMUM RATINGS
at TA = 25C
Supply Voltage, VCC ........................... 26.5 V Reverse Supply Voltage, VRCC ............ -30 V Overvoltage Supply Current, ICC ..... 100 mA Magnetic Flux Density, B ............ Unlimited Output Current, IOUT ..... Internally Limited Output OFF Voltage, VOUT ................. 26.5 V Reverse Output Current, IROUT ......... -50 mA Operating Temperature Range, TA ............................... -40C to +115C Storage Temperature, TS ................... +170C
T C. U LY DN OO n R P E sig D NC de EE UR N E new I TFr N E fo OR0 CR 5 IS O 32 DFA -- se U
V
CC
1
2
3
GROUND
Dwg. PH-003-2
April 12, 1999
OUTPUT
SUPPLY
Always order by complete part number: the prefix 'A' + the basic four-digit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., A3150JLT .
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
FUNCTIONAL BLOCK DIAGRAM
1 SUPPLY
REG. PROGRAM LOGIC OFFSET ADJUST
DYNAMIC OFFSET CANCELLATION
POWER-UP OUTPUT
SAMPLE & HOLD
X
LOW-PASS FILTER
3 CONTROL
CURRENT LIMIT <1 GROUND 2
Dwg. FH-020-3
Two package styles provide a magnetically optimized package for most applications. Suffix `-LT' is a miniature SOT-89/TO-243AA transistor package for surface-mount applications; while suffix `-UA' is a three-lead ultra-mini-SIP for through-hole mounting.
FEATURES AND BENEFITS
s Chopper Stabilized for Extremely Low Switch-Point Drift and Immunity to Mechanical Stress s Externally Programmed Switch Point s On-Chip Supply-Transient Protection s Output Short-Circuit Protection s Single-Chip Sensing IC for High Reliability s Small Mechanical Size s <50 s Power-On Time s Wide Operating Voltage Range s Defined Power-On State
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2000, Allegro MicroSystems, Inc.
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless otherwise noted).
Limits Characteristic Supply Voltage Power-On State Low Output Voltage Output Current Limit Output Leakage Current Supply Current Symbol VCC POS VOUT(SAT) IOUTM IOFF ICC Test Conditions Operating, TJ < 165C After programming, VCC = 0 5 V IOUT = 20 mA VOUT = 12 V VOUT = 24 V Before programming, output OFF Before programming, output ON Reverse Supply Current Power-On Delay Output Rise Time Output Fall Time Clock Frequency Zener Voltage Zener Impedance IRCC ton tr tf fC VZ zz IZT = 100 A, TA = 25C IZT = 10 mA, TA = 25C VRCC = -30 V VCC > 5 V RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF Min. 4.25 HIGH - 65 - - - - - - - - 27 - Typ. - HIGH 175 80 0.2 4.0 5.0 - 20 200 100 340 32 50 Max. 26 HIGH 400 95 10 7.0 8.0 -5.0 50 - - - - 100 Units V - mV mA A mA mA mA s ns ns kHz V
NOTE: Typical data is at VCC = 5 V and TA = +25C and is for design information only.
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits Characteristic Operate Point Symbol BOP Test Conditions Programmable offset range Initial (before programming) Resolution BOP Hysteresis Bhys VCC = 14 V, after programming, BOP 500 G Min. 500 0 8.0 -35 5.0 Typ. 670 20 11 8.0 20 Max. 850 40 14 +35 35 Units G G G G G
NOTE: Typical data is at VCC = 5 V and TA = +25C and is for design information only.
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3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
TYPICAL ELECTRICAL CHARACTERISTICS
5.0
10 T A = +25C
4.0
SUPPLY CURRENT IN mA
SUPPLY CURRENT IN mA
B > B OP
V CC = 5 V
8.0
6.0 B > B OP 4.0 B < B RP 2.0
3.0 B < B RP
2.0
1.0 -50 -25 0 25 50 75 100 125 150
0 0 5 10 15 20 25
AMBIENT TEMPERATURE IN C
Dwg. GH-053-2
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-041-2
300
I OUT = 20 mA V CC = 4.5-24 V
SATURATION VOLTAGE IN mV
200
100
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-040-4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. 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. 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. 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. The chopperstabilizing technique cancels the mismatching of the resistors by changing the direction of the current flowing through the Hall plate and Hall voltage measurement taps, while maintaining the Hall-voltage signal that is induced by the external magnetic flux. The signal is, then, captured by a sample-and-hold circuit. Operation. The output of these devices switches low (turns ON) when a magnetic field (south pole) perpendicular to the Hall sensor exceeds the operate point threshold (BOP). After turn-ON, the output is capable of sinking 25 mA and the output voltage is VOUT(SAT). When the magnetic field is reduced below the release point (BRP), the device output goes 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. Applications. 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. The simplest form of magnet that will operate these devices is a bar magnet with the south-seeking pole towards 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
REG
X
B +V
--
HALL VOLTAGE
+
Dwg. AH-011-2
+V
VCC
OUTPUT VOLTAGE
B RP
B OP
VOUT(SAT)
0 0 FLUX DENSITY +B
Dwg. GH-007-2
SUPPLY
3
PTCT
2
0.1 F
CC
1
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V
Dwg. EH-013
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SAMPLE & HOLD
Dwg. EH-012
OUTPUT
X
SUPPLY
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
PROGRAMMING PROTOCOL
The A3150JLT and A3150JUA operate points are programmed by serially addressing the device through the supply terminal (pin1). After the correct operate point is determined, the device programming bits are selected and then a "lock" set to prevent any further (accidental) programming. Program Enable. To program the device, a sequence of pulses is used to activate/enable the addressing mode as shown in figure 1. This sequence of a VPP pulse, at least seven VPH pulses, and a VPP pulse with no supply interruptions, is designed to prevent the device from being programmed accidentally (for example, as a result of noise on the supply line).
VPP
PROGRAM ENABLE (AT LEAST 7 PULSES)
VPH VPL td(1) 0 td(1) td(0)
Figure 1 -- Program enable
Dwg. WH-013
PROGRAMMING PROTOCOL over operating temperature range.
Limits Characteristic Programming Voltage Symbol VPL VPH VPP Programming Current Pulse Width IPP td(0) td(1) tdP Pulse Rise Time Pulse Fall Time tr tf Max. 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 Description Minimum voltage during programming Min. 4.5 9.0 20 - 20 20 100 11 5.0 Typ. 5.0 10 23 250 - - 300 - - Max. 5.5 11 25 - - - - - - Units V V V mA s s s s s
NOTE: Typical data is at TA = +25C and is for design information only.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
Address Determination. The operate point is adjustable in 64 increments. With the appropriate target or gear* in position, the 64 switch points are sequentially selected (figure 2) until the required operate point is reached. Note that the difference between the operate point and the release point (hysteresis) is a constant for all addresses. Set-Point Programming. After the desired set-point address is determined (0 through 63), each bit of the equivalent binary address is programmed individually. For example, as illustrated in figure 3, to program address code 5 (binary 000101), bits 1 and 3 need to be programmed. Each bit is programmed during the wide VPP pulse and is not reversible. Lock Programming. After the desired set point is programmed, the program lock is then activated (figure 4) to prevent further programming of the device.
ADDRESS N-2
ADDRESS N-1
td(0)
VPH VPL td(1) 0
Dwg. WH-014
Figure 2 -- Address determination
VPP
PROGRAM ENABLE
BIT 3 PROGRAM (000100) ADDRESS 4
PROGRAM ENABLE
VPH VPL td(1) 0 td(1) td(0) tdP
Figure 3 -- Set-point programming
VPP
PROGRAM ENABLE
LOCK PROGRAM (65 PULSES)
VPH VPL td(1) 0
Dwg. WH-016
td(1)
td(0)
tdP
Figure 4 -- Lock programming
* In application, the terms "gear" and "target" are often interchanged. However, "gear" is preferred when motion is transferred.
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BIT 1 PROGRA
Dwg. WH-015
ADDRESS N (UP TO 63)
ADDRESS 0
ADDRESS 1
ADDRESS 2
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
CRITERIA FOR DEVICE QUALIFICATION
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To become qualified, except for the destructive ESD tests, no failures are permitted. Qualification Test Biased Humidity (HAST) High-Temperature Operating Life (HTOL) Accelerated HTOL Test Method and Test Conditions TA = 130C, RH = 85% JESD22-A108, TA = 150C, TJ = 165C JESD22-A108, TA = 175C, TJ = 190C JESD22-A102, Condition C, TA = 121C, 15 psig MIL-STD-883, Method 1008, TA = 170C MIL-STD-883, Method 1010, -65C to +150C -- Test Length 50 hrs 408 hrs Samples 77 77 Comments VCC = VOUT = 5 V VCC = 24 V, VOUT = 20 V VCC = 24 V, VOUT = 20 V
504 hrs
77
Autoclave, Unbiased
96 hrs
77
High-Temperature (Bake) Storage Life Temperature Cycle
1000 hrs
77
500 cycles
77
Latch-Up
Pre/Post Reading Pre/Post Reading Pre/Post Reading --
6
Electro-Thermally Induced Gate Leakage ESD, Human Body Model Electrical Distributions
--
6
CDF-AEC-Q100-002
x per test 30
Test to failure, All leads > TBD
Per Specification
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
(0.005" [0.13 mm] die placement) Package Designator "LT"
ACTIVE AREA DEPTH 0.030" 0.76 mm NOM
SENSOR LOCATIONS
0.088" 2.24 mm 0.045" 1.14 mm
A
1 2 3
Dwg. MH-008-8
Package Designators "UA" and "UA-TL"
ACTIVE AREA DEPTH 0.018" 0.46 mm NOM
0.080" 2.04 mm
0.056" 1.44 mm
A
BRANDED SURFACE 1 2 3
Dwg. MH-011-9A
Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location.
Allegro
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3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
PACKAGE DESIGNATOR 'LT'
(SOT-89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.181 0.173 0.072 0.064 0.167 0.155 0.102 0.090
0.063 0.055
0.0173 0.0138
4.60 4.40 1.83 1.62 4.25 3.94 2.60 2.29
1.60 1.40
0.44 0.35
1
2
3
0.090 0.084
1
2
3
2.29 2.13
0.047 0.035 0.059
BSC
0.0189 0.0142 0.0221 0.0173 0.118
BSC
Dwg. MA-009-3A in
1.20 0.89 1.50
BSC
0.48 0.36 0.56 0.44 3.00
BSC
Dwg. MA-009-3A mm
0.098 0.079 B A 0.031 0.102 0.181 3 0.047 0.031
TYP
2.5 2.0 B A 0.8 2.6 4.6 1.2 0.8
TYP
1 0.028
TYP
2
1 0.7
TYP
2
3
ads 1, 2, 3, and A -- Standard SOT-89 Layout ads 1, 2, 3, and B -- Low-Stress Version ads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 in
Pads 1, 2, 3, and A -- Standard SOT-89 Layout Pads 1, 2, 3, and B -- Low-Stress Version Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 mm
NOTE: Exact body and lead configuration at vendor's option within limits shown.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
PACKAGE DESIGNATOR 'UA'
Dimensions in Inches (controlling dimensions)
0.164 0.159
Dimensions in Millimeters (for reference only)
4.17 4.04
45
0.062 0.058
45
1.57 1.47
0.122 0.117 45 0.031
3.10 2.97 45 0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640 0.600
0.0173 0.0138
16.26 15.24
0.44 0.35
SEE NOTE
0.0189 0.0142
SEE NOTE
0.48 0.36
0.050
BSC
Dwg. MH-014E in
1.27
BSC
Dwg. MH-014E mm
Surface-Mount Lead Form (Suffix '-TL')
0.095
0.005
2.41
0.13
0.002
MAX
0.051
MAX
0.004 0-8
MAX
0.020
MIN FLAT
Dwg. MH-015 in
0.10
MAX
0-8 0.51
MIN FLAT
Dwg. MH-015 mm
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.
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3150 PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH
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; 5,729,130; 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 responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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