ATS616LSG
Dynamic Self-Calibrating Peak-Detecting Differential
Hall Effect Gear Tooth Sensor IC
Description
Features and Benefits
The ATS616 gear-tooth sensor IC is a peak-detecting device
Self-calibrating for tight timing accuracy
that uses automatic gain control and an integrated capacitor
First-tooth detection
to provide extremely accurate gear edge detection down to
Immunity to air gap variation and system offsets
low operating speeds. Each package consists of a high-tem-
Eliminates effects of signature tooth offsets
perature plastic shell that holds together a samarium-cobalt
Integrated capacitor provides analog peak and valley
pellet, a pole piece, and a differential open-collector Hall IC
information
that has been optimized to the magnetic circuit. This small
Extremely low timing-accuracy drift with temperature
package can be easily assembled and used in conjunction
changes
with a wide variety of gear shapes and sizes.
Large air gap capability
Small, integrated package
The technology used for this circuit is Hall-effect based.
Optimized magnetic circuit
The chip incorporates a dual-element Hall IC that switches
Undervoltage lockout (UVLO)
in response to differential magnetic signals created by fer-
Wide operating voltage range
romagnetic targets. The sophisticated processing circuitry
contains an A-to-D converter that self-calibrates (normal-
Package: 4-pin SIP (suffix SG)
izes) 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 replace-
ment for the ATS612LSB, eliminating the external peak-
holding capacitor needed by the ATS612LSB.
Not to scale
Continued on the next page
Functional Block Diagram
VCC
Voltage Power-On
UVLO
Regulator Logic
Tooth and Valley
Comparator
VOUT
Gain
Hall
Amp
Track and
Hold
Current
Reference Limit
Generator
Hall
Amp
Track and
Hold
GND TEST
(Recommended)
ATS616LSG-DS, Rev. 4Dynamic Self-Calibrating Peak-Detecting Differential
ATS616LSG
Hall Effect Gear Tooth Sensor IC
Description (continued)
The ATS616 is ideal for use in systems that gather speed, posi- detection, such as automotive camshaft sensing.
tion, and timing information using gear-tooth-based configura-
TheATS616 is provided in a 4-pin SIP that is Pb (lead) free, with
tions. This device is particularly suited to those applications that
require extremely accurate duty cycle control or accurate edge- a 100% matte tin plated leadframe.
Selection Guide
Part Number Package Packing*
ATS616LSGTN-T 4-pin plastic SIP 800 pieces per 13-in. reel
*Contact Allegro for additional packing options
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Unit
Supply Voltage V See Power Derating section 26.5 V
CC
Reverse-Supply Voltage V 18 V
RCC
Output Off Voltage V 24 V
OUTOFF
Continuous Output Current I 25mA
OUT
Reverse-Output Current I 50 mA
ROUT
Operating Ambient Temperature T L temperature range 40 to 150 C
A
Maximum Junction Temperature T (max) 165 C
J
Storage Temperature T 65 to 170 C
stg
Pin-out Diagram
Terminal List Table
Number Name
1 VCC
2 VOUT
3 Test Pin (tie to GND)
4 GND
1243
Allegro MicroSystems, LLC
2
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com