ATS616LSG
Dynamic Self-Calibrating Peak-Detecting Differential
Hall Effect Gear Tooth Sensor
The ATS616 gear-tooth sensor is a peak-detecting device that uses automatic gain
control and an integrated capacitor to provide extremely accurate gear edge detec-
tion down to low operating speeds. Each sensor module consists of a high-tem-
perature plastic shell that holds together a samarium-cobalt magnet, a pole piece,
and a differential open-collector Hall 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 gear-sensing technology used for this sensor module is Hall-effect based. The
sensor incorporates a dual-element Hall IC that switches in response to differential
magnetic signals created by ferrous targets. The sophisticated processing circuitry
contains an A-to-D converter that self-calibrates (normalizes) the internal gain
of the device to minimize the effect of air-gap variations. The patented peak-
detecting filter circuit eliminates magnet and system offsets and has the ability to
discriminate relatively fast changes such as those caused by tilt, gear wobble, and
eccentricities. This easy-to-integrate solution provides first-tooth detection and
stable operation to extremely low rpm. The ATS616 can be used as a replacement
for the ATS612LSB, eliminating the external peak-holding capacitor needed by
the ATS612LSB.
The ATS616 is ideal for use in systems that gather speed, position, and timing
information using gear-tooth-based configurations. This device is particularly
suited to those applications that require extremely accurate duty cycle control or
accurate edge-detection, such as automotive camshaft sensing.
TheATS616 is provided in a 4-pin SIP that is Pb (lead) free, with a 100% matte
tin plated leadframe.
Package SG, 4-pin SIP
12
34
1. VCC
2. VOUT
3. Test Pin (Tie to GND)
4. GND
Features and Benefits
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
.....................................
26.5 V*
Reverse-Supply Voltage, V
RCC
........................
鈥?8 V
Output Off Voltage, V
OUTOFF
............................
24 V
Continuous Output Current, I
OUT
...................25
mA
Reverse-Output Current, I
ROUT
.......................50
mA
Operating Temperature
Ambient, T
A
, Range L................
鈥?0潞C to 150潞C
Maximum Junction, T
J(max)
........................165潞C
Storage Temperature, T
S
..................
鈥?5潞C to 170潞C
*See Power Derating section.
鈥?Self-calibrating for tight timing accuracy
鈥?First-tooth detection
鈥?Immunity to air gap variation and system offsets
鈥?Eliminates effects of signature tooth offsets
鈥?Integrated capacitor provides analog peak and valley information
鈥?Extremely low timing-accuracy drift with temperature changes
鈥?Large air gap capability
鈥?Small, integrated package
鈥?Optimized magnetic circuit
鈥?Undervoltage lockout (UVLO)
鈥?Wide operating voltage range
Use the following complete part numbers when ordering:
Part Number
ATS616LSGTN-T
Package
4-pin plastic SIP
Packing*
13-in. reel, 800 pieces/reel
*Contact Allegro for additional packaging and handling options.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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