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Preliminary Data Sheet Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
The ATS650 is an optimized Hall effect sensor combining sensor element, integrated circuit, and magnet in a manufacturer-friendly solution for digital geartooth sensing in two-wire applications. It provides true zero-speed sensing as well as detection of the direction of target movement. The device consists of a singleshot molded plastic package that includes a samarium cobalt magnet, a pole piece, and a Hall effect IC that has been optimized to the magnetic circuit. This small package can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. The Hall effect sensor IC is a single chip solution that integrates three highly sensitive Hall effect transducers and precise signal processing circuitry that switches in response to magnetic signals created by ferrous gear teeth. The circuitry contains a sophisticated digital circuit to minimize the effects of magnet and system offsets and to achieve optimal, true zero-speed operation. Signal optimization is performed each time the sensor is powered-on. Internal circuitry maintains signal optimization and encodes diagnostic information in the output signal of the device. The regulated current output is configured for two-wire operation. It has direction and diagnostic capabilities incorporated into the speed signal output. The ATS650 is ideal for obtaining speed, direction, and diagnostic information using gear-tooth-based targets found in ABS and transmission applications.
34
Package SH
12
For ring magnet applications, use the A1650.
1. VCC 2. Test pin, Channel 1 3. Test pin, Channel 2 4. GND
Features and Benefits
* * * * * * * * * * * * * * * Fully optimized digital differential gear tooth sensor Single chip sensing IC for high reliability Small mechanical size (8 mm diameter x 5.5 mm depth) Internal current regulator for 2-wire operation Rotational direction detection Digital output protocol with integrated diagnostic information On-chip temperature sensing for diagnostic capability On-chip air gap diagnostics Automatic Gain Control (AGC) and reference adjust circuit 3-bit factory trimming for tight pulse width accuracy True zero-speed operation Wide operating voltage range Undervoltage lockout Defined power-on state ESD and reverse polarity protection
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .......................................... 28 V Reverse-Supply Voltage, VRCC ........................ -18 V Reverse-Output Current, IROUT.....................-50 mA Reverse-Output Voltage, VROUT ...................-50 mA Operating Temperature Ambient, TA................................ -40C to 150C Maximum Junction, TJ(MAX) ......................165C Storage Temperature, TS .................. -65C to 170C
Use the following complete part numbers when ordering:
Part Number ATS650LSH-I1 ATS650LSH-I2 ICC Typical (mA) 4.0 Low to 16.0 High 5.9 Low to 16.8 High
Engineering samples available on a limited basis. Contact your local sales or applications support office for additional information.
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output Functional Block Diagram
VCC
Internal Regulator Offset Adjustment Speed
Hall Elements
Amplifier
AGC
Air Gap Diagnostics
Temperature Diagnostics
Output Control
Current Switch
Direction GND
Typical Application Diagram
ECU ICC(HIGH)/ICC(LOW)
1
2
ATS650
3
0.01 F
4
Note: Pins 2 and 3 may be connected to pin 4. However, ICC is increased in that configuration.
100 RSENSE
CSENSE
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
2
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
ELECTRICAL CHARACTERISTICS Valid for -40C TA 150C; TJ 165C, unless otherwise noted Characteristics Supply Voltage Undervoltage Lockout Reverse Supply Current Supply Zener Clamp Voltage Output Zener Clamp Voltage Supply Zener Current Output Zener Current Power-On State Power-On Time Symbol VCC VCC(UV) IRCC VZCC VZOUT IZCC IZOUT IPO tPO ICC(LOW) Supply Current1 ICC(HIGH) SWITCHING Operate Point Release Point Initial Calibration Cycle2 Direction Calibration Cycle Direction Change Detection3 OP RP NCal NDir NCD PWTOL WA/R dIOUT/dt fR fL Diagnostic Data Drop-Out Frequency5 fDO ICC(HIGH) ICC(LOW) ; Positive peak referenced ICC(LOW) ICC(HIGH) ; Negative peak referenced Calibration occurs at each power-on Calibration occurs at each power-on Running mode direction change Reference Gear 60-0 Total Indicated Runout (TIR) ICC(HIGH) ICC(LOW) , ICC(LOW) ICC(HIGH); RSENSE = 100 , CSENSE = 10 pF; 10/90% pts. Rotation right to left (pin 4 pin 1); LD = 38 s Rotation left to right (pin 1 pin 4); LD = 38 s No diagnostics beyond this frequency - - - - - -15 - - 2.04 5.55 3.52 100 100 - - - - - 16 2.29 6.02 3.70 - - 3 0 1 15 0.5 - 2.62 6.58 4.39 mV mV Edges Edges Edges % mm mA/s kHz kHz kHz ATS650-I1 package ATS650-I2 package ATS650-I1 package ATS650-I2 package Test Conditions Running mode VCC = 5 V 0 V VCC = -18 V ICC = ICC(MAX) + 3 mA; TA = 25C IOUT = 3 mA; TA = 25C VCC = 28 V VOUT = 30 V Min. 4.3 - - 28 30 - - - - 4.0 5.9 12.0 11.8 Typ. - - - - - - - ICC(LOW) 0.32 6.0 7.0 14.0 14.0 Max. 24 < VCC(MIN) -10 - - ICC(MAX)+ 3 3 - 1.00 8.0 8.4 16.0 16.8 Units V V mA V V mA mA mA ms mA mA mA mA
Protocol Pulse Width Tolerance Axial/Radial Runout Output Current Slew Rate
Maximum Operating Frequency4
Continued on the next page.
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
3
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
ELECTRICAL CHARACTERISTICS (Continued) Valid for -40C TA 150C; TJ 165C, unless otherwise noted Characteristics DIAGNOSTIC CHARACTERISTICS Maximum Air Gap Threshold6 Air Gap Warning Threshold7 Installation Threshold Low Temperature Threshold High Temperature Threshold BLimit BThresh BInstall TJ(LOW) TJ(HIGH) Maximum air gap limit exceeded Apporaching maximum air gap limit Nominal operating threshold IC junction temperature IC junction temperature Falling output signal edge to subsequent rising output signal edge Rotation right to left (pin 4 pin 1) Rotation left to right (pin 1 pin 4); Data Bit 0 Rotation left to right (pin 1 pin 4); Data Bit 1; fL < fDO 12 20 43 -20 75 17 29 62 -5 95 25 44 94 10 115 GPK-PK GPK-PK GPK-PK C C Symbol Test Conditions Min. Typ. Max. Units
PROTOCOL PULSE CHARACTERISTICS Low State Duration4 Pulse Width Right Rotation Pulse Width Left Rotation PWL1
1I CC(HIGH) ICC(LOW) 1.85 mA. 2Edge count is based on mechanical 3Edge
LD PWR PWL0
10 153 38 76
- 180 45 90
- 207 52 104
s s s s
edges. On the NCal edge, direction and speed information is valid. count is based on mechanical edges. On the NCD edge, direction and speed information is valid. 4Maximum Operating Frequency may be increased if the application can resolve at L D(MIN). 5Diagnostic Data Drop-Out Frequency is based on a fixed internal clock frequency and is independent of L . D 6Diagnostic gauss levels track each other such that proper order is maintained. 7Nonsinusoidal target magnetic profiles may result in an incorrect direction signal for field levels below B Thresh.
Characterization Data
Icc vs. Temperature, VCC = 12 V
16
14
12
ICC(HIGH)
Icc (mA)
10
8
ICC(LOW)
6
4 -40 -20 0 20 40 60 80 100 120 140 160
Temperature, TA (C)
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ATS650LSH-DS Rev. 0
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output Applications Information
Data Protocol Description As the target passes the branded face of the sensor, each gear tooth edge of the target generates a pulse from the sensor. The combination of pulses is used to provide data. Examples are shown in figure 2, on the next page. Target rotational speed is indicated by the pulse rate (the sum of the pulse width and the following LD). Direction is indicated by the width of the pulse: a pulse of 180 s indicates right-to-left rotation, and a pulse width of 45 or 90 s indicates left-to-right rotation, as shown in figure 1. The two pulse widths of the left-to-right rotation signal allow it to also convey binary diagnostic information. The 45 s pulse indicates not only left-to-right rotation, but also a logic zero data bit. The 90 s pulse indicates a logic one data bit. Decoding Diagnostic Data Transmissions The protocol provides diagnostic information in the form of 3-bit data words. Each data sequence consists of a Start Data Sequence word and two data words. To distinguish the data words from the Start Data Sequence word, the third bit of the data words acts as a delimiter, and is always 0 (logic low). Because the delimiter occupies one bit, only four possible states can be indicated by each word. The code sequence and meanings of the diagnostic signals are shown in the table below.
Rotation Speed Considerations
LD
180 s, Right-to-Left 90 s, Left-to-Right / Binary 1 45 s, Left-to-Right / Binary 0 Figure 1. Data encoding pulse widths
As the speed of the target increases, the rate of pulse generation increases as well, and the gap between the data pulses decreases. The left-to-right direction can support higher rotational speeds because of the shorter pulse widths it generates. At very high rotational speeds, when the pulse rate exceeds the Diagnostic Data Drop-Out Frequency, FDO , the sensor transmits only the shortest pulse, 45 s. This allows the sensor to provide speed and directional data at very high speeds. Because the 90 s pulse width is not used, however, diagnostic data is not available. The right-to-left rotational direction is indicated by the longest of the three pulse widths, and consequently, the gaps between the pulses begin to collapse at a lower speed.
Diagnostic Data Codes Word Bit Name Start Data Sequence Air Gap Diagnostics Maximum Air Gap Threshold Air Gap Warning Threshold Installation Threshold Air Gap OK Temperature Diagnostics Temperature Low Temperature Midrange Temperature High Description Initializes data stream B < BLIMIT BLIMIT < B < BTHRESH BTHRESH < B < BINSTALL B > BINSTALL TJ < TJ(LOW) TJ(LOW) < TJ < TJ(HIGH) TJ > TJ(HIGH) 1 1 Initialization 2 1 3 1 0 0 1 1 0 1 1 0 0 0 0 0 0 1 1 0 0 1 0 0 0 4 Data 1 5 6 7 Data 2 8 9
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
5
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
90s = L/R,1 +LD(s) = Speed 90s = L/R,1 +LD(s) = Speed 90s = L/R,1 +LD(s) = Speed 45s = L/R,0 +LD(s) = Speed 45s = L/R,0 +LD(s) = Speed 45s = L/R,0 +LD(s) = Speed 90s = L/R,1 +LD(s) = Speed 90s = L/R,1 +LD(s) = Speed 45s = L/R,0 +LD(s) = Speed 90s = L/R,1 +LD(s) = Speed 90s = L/R,1 +LD(s) = Speed 90s = L/R,1 Start Data Sequence (2) 1 1 1 Data Word 2: Temperature High 0 1 1 Data Word 1: Maximum Air Gap Threshold 0 0 0 1 Start Data Sequence (1) 1 1 Speed Direction and Binary Value
Branded Face of Sensor
Left-to-Right Target Rotation
Data Stream Output
Word Value Data Bit Value Output Current Level Branded Face of Sensor
Target (Gear)
Target
1
4
Data Stream Output
180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L +LD(s) = Speed 180s = R/L
Right-to-Left Target Rotation
Speed Output Current Level Branded Face of Sensor Target (Gear) Direction
Target
Branded Face of Sensor
1
4
Figure 2. Examples of data encoding capabilites by rotation direction. The upper panel illustrates a typical data sequence that can be generated when the target is rotating left-to-right relative to the sensor. The lower panel illustrates a typical data stream output when the target is rotating in a right-to-left direction relative to the sensor.
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
6
ATS650LSH-DS Rev. 0
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
REFERENCE TARGET, 60-0 (60 Tooth Target) Characteristics Outside Diameter Face Width Circular Tooth Length Circular Valley Length Tooth Whole Depth Material Symbol Do F t tv ht Low Carbon Steel Test Conditions Outside diameter of target Breadth of tooth, with respect to sensor Length of tooth, with respect to sensor; measured at Do Length of valley, with respect to sensor; measured at Do Typ. 120 6 3 3 3 - Units mm mm mm mm mm - Symbol Key
Reference Gear Magnetic Gradient Amplitude with Reference to Air Gap
1800 1600 1400 1200 1000 800 600 400 200 0 0.5 1 AG (mm) 1.5 2 2.5
Peak-to-Peak Differential B* (G)
Branded Face of Sensor Reference Target 60-0
700 600 500
Reference Gear Magnetic Profile Two Tooth-to-Valley Transitions
Differential B* (G)
400 300 200 100 0 -100 -200 -300 -400 -500 -600 -700 0 1 2 3 4 5 6 7 8 9 10 11 12 Gear Rotation () 2.00 mm AG 0.50 mm AG
AG (mm) 0.50 0.75 1.00 1.25 1.50 1.75 2.00
*Differential B corresponds to the calculated difference in the magnetic field as sensed simultaneously at the two Hall elements in the device (BDIFF = BE1 - BE2).
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
7
ATS650LSH-DS Rev. 0
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic Package Thermal Resistance Symbol RJA Test Conditions Min. Minimum-K PCB (single-sided with copper limited to 126 solder pads) Low-K PCB (single-sided with copper limited to solder 84 pads and 3.57 in.2 (23.03 cm2) of copper area) Typ. - - Max Units - - C/W C/W
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 20 40
Power Derating Curve TJ(max) = 165C; ICC = ICC(max)
Maximum Allowable VCC (V)
VCC(max) Low-K PCB (RJA = 84 C/W) Minimum-K PCB (RJA = 126 C/W)
VCC(min)
60 80 100 120 140 160 180
1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 20
Maximum Power Dissipation, PD(max) TJ(max) = 165C; VCC = VCC(max); ICC = ICC(max)
Power Dissipation, PD (m W)
K J A = PC Mi n 84 B (R imu C mJ A= KP /W 12 ) 6 CB C/ W)
Lo (R w-
40
60
80 100 120 Temperature (C)
140
160
180
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
8
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Power Derating
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
The device must be operated below the maximum junction temperature of the device, TJ(max). Under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the application. This section presents a procedure for correlating factors affecting operating TJ. (Thermal data is also available on the Allegro MicroSystems Web site.) The Package Thermal Resistance, RJA, is a figure of merit summarizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. Its primary component is the Effective Thermal Conductivity, K, of the printed circuit board, including adjacent devices and traces. Radiation from the die through the device case, RJC, is relatively small component of RJA. Ambient air temperature, TA, and air motion are significant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate TJ, at PD. PD = VIN x IIN T = PD x RJA TJ = TA + T (1) (2) (3)
Example: Reliability for VCC at TA = 150C, package L-I1, using minimum-K PCB Observe the worst-case ratings for the device, specifically: RJA = 126C/W, TJ(max) = 165C, VCC(max) = 24 V, and ICC(max) = 16 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: Tmax = TJ(max) - TA = 165 C - 150 C = 15 C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = Tmax / RJA = 15C / 126 C/W = 119 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) / ICC(max) = 119 mW / 16 mA = 7 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages VCC(est). Compare VCC(est) to VCC(max). If VCC(est) VCC(max), then reliable operation between VCC(est) and VCC(max) requires enhanced RJA. If VCC(est) VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions.
For example, given common conditions such as: TA= 25C, VCC = 12 V, ICC = 4 mA, and RJA = 140 C/W, then: PD = VCC x ICC = 12 V x 4 mA = 48 mW T = PD x RJA = 48 mW x 140 C/W = 7C TJ = TA + T = 25C + 7C = 32C A worst-case estimate, PD(max), represents the maximum allowable power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RJA and TA.
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
9
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
Package SH
5.5 .217
C
8.0
.315
B
5.8
.228 2.9 .114
4.0 5.0 20.95 .825 .244
.157 1.7 .067 1 2 3 4
A
0.38 .015
1.08 .043 1 .039 13.05 .514
A
D
0.6 .024 1.27 .050
Dimensions in millimeters. Untoleranced dimensions are nominal. U.S. Customary dimensions (in.) in brackets, for reference only A Dambar removal protrusion
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
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
10
Preliminary - Subject to Change Without Notice June 3, 2004
ATS650LSH
Two-Wire Direction Detection Gear Tooth Sensor with Diagnostic Output
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 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 infringement of patents or other rights of third parties which may result from its use. Copyright (c) 2004 Allegro MicroSystems, Inc.
ATS650LSH-DS Rev. 0
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
11

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