Document
Data Sheet 27627.107a
ATS660LSB
TRUE ZERO-SPEED, HALL-EFFECT ADAPTIVE GEAR-TOOTH SENSOR IC
1 2 3 4
Pin 1 = Supply Pin 2 = Output Pin 3 = Internal Connection Pin 4 = Ground
Dwg. AH-006-4
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
Supply Voltage, VCC ........................ 26.5 V* Reverse Supply Voltage, VRCC ............ -24 V Output OFF Voltage, VOUT ................. 26.5 V Reverse Output Voltage, VROUT .......... -24 V Continuous Output Current, IOUT ....... 20 mA Reverse Output Current, IROUT .......... 50 mA Package Power Dissipation,
PD .......................................... See Graph Operating Temperature Range,
TA ............................. -40°C to +150°C*
Junction Temperature,
(continuous), TJ .......................... +165°C (100 hr), TJM ............................... +180°C Storage Temperature, TS ................... +170°C
* Operation at increased supply voltages with external circuitry is described in Applications Information. Devices for operation at increased temperatures are available on special order.
The ATS660LSB is an ideal gear-tooth sensor IC solution for uniform teeth targets as found in today’s demanding transmission applications. This digital differential Hall-effect circuit is the choice when repeatability and timing accuracy count. The ATS660LSB incorporates patented self-calibration circuitry (U.S. Pat. 5,917,320) that nulls out the effects of installation air gap, ambient temperature, and magnet offsets to provide superior timing accuracy with symmetrical targets over large operating air gaps — typical of targets used in speed-sensing applications (pitches varying from below 0.5 to over 1.2 teeth per diametric millimeter). The self-calibration at power up keeps the performance optimized over the life of the device. The ATS660LSB has an opencollector output for direct digital interfacing with no further signal processing required. This device is available in a small 9-mm diameter by 7-mm long package for optimal manufacturing.
The integrated circuit incorporates a dual-element Hall-effect IC and signal processing that switches in response to differential magnetic signals created by the ferrous gear teeth. The circuitry contains a sophisticated digital circuit to eliminate magnet and system offsets and to achieve true zero-speed operation . D-to-A converters are used to adjust the device gain at power on and to allow air-gap independent switching, which greatly reduces vibration sensitivity of the device.
FEATURES AND BENEFITS
■ Fully optimized differential digital gear-tooth sensor IC ■ Single-chip sensing IC for high reliability ■ High vibration immunity ■ Precise duty cycle ■ Small mechanical size (9 mm diameter x 7 mm length) ■ Automatic gain control circuitry (self calibration) ■ True zero-speed operation ■ Under-voltage lockout ■ Wide operating temperature range ■ Optimized Hall IC magnetic circuit ■ Digital signal processing ■ Large operating air gap range ■ Wide operating voltage range ■ Excellent repeatability performance ■ Defined power-on state
Always order by complete part number: ATS660LSB .
ATS660LSB TRUE ZERO-SPEED, HALL-EFFECT ADAPTIVE GEAR-TOOTH SENSOR IC
FUNCTIONAL BLOCK DIAGRAM
1 SUPPLY
REG
32 V
UVLO
POWER-ON LOGIC
X E1
–
–
MAGNET
+ REF +
X E2
POSITIVE PEAK DIGITAL PROC.
NEGATIVE PEAK DIGITAL PROC.
THRESHOLD COMPARATORS
– +
– +
Dwg. FH-019-2A
Pin 3 must be externally connected to pin 4.
3 INTERNAL CONNECTION
CONTROL
OUTPUT 2
CURRENT LIMIT
<1Ω
GROUND 4
ALLOWABLE PACKAGE POWER DISSIPATION IN mW
REFERENCE GENERATOR
OUTPUT LOGIC
1000
800 RθJA = 147°C/W
600 400
CONT1IN00UHOOUUSRS MAX.
200
0 20 40 60 80 100 120 140 160 180
AMBIENT TEMPERATURE IN °C
Dwg. GH-065-6
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2002 Allegro MicroSystems, Inc.
ATS660LSB TRUE ZERO-SPEED, HALL-EFFECT ADAPTIVE GEAR-TOOTH SENSOR IC
ELECTRICAL CHARACTERISTICS at VCC = VOUT = 12 V and TA = +25°C (unless otherwise noted).
Characteristic
Symbol Test Conditions
Limits Min. Typ. Max.
Units
Supply Voltage Power-On State Under-Voltage Lockout Low Output Voltage Output Current Limit Output LeakageCurrent Supply Current
VCC POS VCC(UV) VOUT(SAT) IOUTM IOFF ICC
Operating, TJ < 165°C VCC = 0 → 5 V VCC = 0 → 5 V IOUT = 20 mA
VOUT = 24 V Output off Output on
4.5 12 24 HIGH* HIGH* HIGH*
4.1 4.2 4.3 – 0.2 0.4 25 45 55 – 0.2 10 3.5 7.0 12 5.0 8.5 14
V – V V mA µA mA mA
Output Rise Time
Ir RL = 500 Ω, CL = 10 pF
Output Fall Time
If RL = 500 Ω, CL = 10 pF
Power-On Time
ton Reference gear, <100 rpm
Zener Voltage
VZ IZT = TBD
* Output transistor is OFF (high logic level).
– 0.2 5.0 – 0.2 5.0 – – 200 – 32 –
µs µs µs V
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ATS660LSB TRUE ZERO-SPEED, HALL-EFFECT ADAPTIVE GEAR-TOOTH SENSOR IC
OPERATION with reference gear at TA = +25°C.
Characteristic Air-Gap Range Calibration Cycle
Recalibrat.