ATS667LSG
True Zero-Speed, High Accuracy Gear Tooth Sensor IC
Features and Benefits Description
Optimized robustness against magnetic offset variation
The ATS667 is a true zero-speed gear tooth sensor IC consisting
Small signal lockout for immunity against vibration
of an optimized Hall IC-rare earth pellet configuration in a
Tight duty cycle and timing accuracy over full operating
single overmolded package. The unique IC and package design
temperature range
provides a user-friendly solution for digital gear tooth sensing
True zero-speed operation
applications. This small package can be easily assembled and
Air gap independent switchpoints
used in conjunction with gears of various shapes and sizes.
Large operating air gaps achieved through use of gain
The device incorporates a dual element Hall IC that switches
adjust and offset adjust circuitry
in response to differential magnetic signals created by a ferro-
Defined power-on state (POS)
magnetic target. The IC contains a sophisticated compensating
Wide operating voltage range
circuit designed to eliminate the detrimental effects of magnet
Digital output representing target profile
and system offsets. Digital processing of the analog signal
Single chip sensing IC for high reliability
provides zero-speed performance independent of air gap and
Small mechanical size
also dynamic adaptation of device performance to the typical
Optimized Hall IC magnetic system
operating conditions found in automotive applications (reduced
Fast start-up
vibration sensitivity). High-resolution peak detecting DACs
Undervoltage lockout (UVLO)
are used to set the adaptive switching thresholds of the device.
Package: 4-pin SIP (suffix SG) Hysteresis in the thresholds reduces the negative effects of any
anomalies in the magnetic signal associated with the targets
used in many automotive applications.
The ATS667 is optimized for transmission applications. It is
available in a lead (Pb) free 4-pin SIP package with a 100%
matte tin plated leadframe.
Not to scale
Functional Block Diagram
VCC
Voltage
Regulator
Threshold
Comparator
Automatic
Gain
PDAC
Control PThresh
V
PROC
Offset Threshold
Hall Reference
Amp Adjust Logic
Generator
NThresh
NDAC
TEST
VOUT
Current Output
Limit Transistor
GND
ATS667-DS, Rev. 5ATS667LSG True Zero-Speed, High Accuracy Gear Tooth Sensor IC
Selection Guide
Part Number Packing*
ATS667LSGTN-T 13-in. reel, 800 pieces/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
Reverse Supply Current I 50 mA
RCC
Reverse Output Voltage V 0.5 V
ROUT
Output Sink Current I 25 mA
OUT
Operating Ambient Temperature T Range L 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
Number Name Function
1 VCC Supply voltage
2 VOUT Device output
1243
3 TEST Tie to GND or float
4 GND Ground
Allegro MicroSystems, LLC
2
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com