ATS625LSGTN-T Allegro Microsystems Inc, ATS625LSGTN-T Datasheet

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ATS625LSGTN-T

Manufacturer Part Number
ATS625LSGTN-T
Description
IC SENSOR GEAR TOOTH 4-SIP
Manufacturer
Allegro Microsystems Inc
Type
Special Purposer
Datasheet

Specifications of ATS625LSGTN-T

Sensing Range
60% Trip, 40% Release
Voltage - Supply
4 V ~ 24 V
Current - Supply
14mA
Current - Output (max)
10mA
Output Type
Digital, Open Collector
Features
Gear Tooth Type
Operating Temperature
-40°C ~ 150°C
Package / Case
4-SIP
Rohs Compliant
YES
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Features and Benefits
▪ Highly repeatable over operating temperature range
▪ Tight timing accuracy over operating temperature range
▪ True zero-speed operation
▪ Air-gap–independent switchpoints
▪ Vibration immunity
▪ Large operating air gaps
▪ Defined power-on state
▪ Wide operating voltage range
▪ Digital output representing target profile
▪ Single-chip sensing IC for high reliability
Continued on the next page…
Package: 4 pin SIP (suffix SG)
Not to scale
ATS625LSG-DS, Rev. 4
V+
0.1 F
C
BYPASS
VCC
Amp
Hall
Regulator
Voltage
Automatic
Control
Gain
Functional Block Diagram
GND
V
High Accuracy Gear Tooth Sensor IC
PROC
(Recommended)
PDAC
NDAC
PPeak
NPeak
Description
The ATS625 true zero-speed gear tooth sensor IC is an optimized
Hall IC and rare earth pellet configuration that provides a
manufacturer-friendly solution for digital gear tooth sensing
applications. The over-molded package holds together a
samarium cobalt pellet, a pole piece concentrator, and a true
zero-speed Hall IC that has been optimized to the magnetic
circuit. This small package can be easily assembled and used
in conjunction with gears of various shapes and sizes.
The device incorporates a dual-element Hall IC that switches
in response to differential magnetic signals created by a ferrous
target. Digital processing of the analog signal provides zero-
speed performance independent of air gap as well as dynamic
adaptation of device performance to the typical operating
conditions found in automotive applications (reduced vibration
sensitivity). High-resolution peak detecting DACs are used to
set the adaptive switching thresholds of the device. Switchpoint
hysteresis reduces the negative effects of any anomalies
in the magnetic signal associated with the targets used in
many automotive applications. This device is optimized for
crank applications that utilize targets that possess signature
regions.
The ATS625 is provided in a 4-pin SIP. It is lead (Pb) free,
with 100% matte tin plated leadframe.
True Zero-Speed Low-Jitter
Reference
Generator
AUX
PThresh
NThresh
Current
Limit
Comparator
Threshold
Threshold
Transistor
Output
Logic
ATS625LSG
VOUT

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ATS625LSGTN-T Summary of contents

Page 1

Features and Benefits ▪ Highly repeatable over operating temperature range ▪ Tight timing accuracy over operating temperature range ▪ True zero-speed operation ▪ Air-gap–independent switchpoints ▪ Vibration immunity ▪ Large operating air gaps ▪ Defined power-on state ▪ Wide operating ...

Page 2

... Optimized Hall IC magnetic system ▪ Fast start-up ▪ AGC and reference adjust circuit ▪ Undervoltage lockout Selection Guide Part Number ATS625LSGTN Contact Allegro for additional packing options. 2 Some restrictions may apply to certain types of sales. Contact Allegro for details. Absolute Maximum Ratings ...

Page 3

ATS625LSG Valid at T Operating Characteristics operating parameters and T CC Characteristic ELECTRICAL CHARACTERISTICS Supply Voltage Undervoltage Lockout Reverse Supply Current 1 Supply Zener Clamp Voltage Supply Zener Current 2 Supply Current POWER-ON CHARACTERISTICS Power-On State ...

Page 4

ATS625LSG Operating Characteristics, continued typical operating parameters and T CC Characteristic OPERATING CHARACTERISTICS with 60+2 reference target Operational Air Gap Relative Timing Accuracy, Sequen- tial Mechanical Rising Edges Relative Timing Accuracy, Sequen- tial Mechanical Falling Edges ...

Page 5

ATS625LSG REFERENCE TARGET 60+2 Characteristics Symbol Outside Diameter D Outside diameter of target o Breadth of tooth, with respect to Face Width F branded face Length of tooth, with respect to Circular Tooth Length t branded face; measured at D ...

Page 6

ATS625LSG I Versus V CC(ON Voltage (V) I Versus V CC(OFF ...

Page 7

ATS625LSG Characteristic Data: Relative Timing Accuracy Relative Timing Accuracy Versus Speed Signature Tooth Rising Edge 0.5 mm Air Gap 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 500 1000 1500 0 Target Speed, S (rpm) Relative Timing Accuracy Versus Speed Signature ...

Page 8

ATS625LSG Relative Timing Accuracy Versus Speed Signature Tooth Rising Edge 2.5 mm Air Gap 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 500 1000 1500 0 Target Speed, S (rpm) Relative Timing Accuracy Versus Speed Signature Tooth Falling Edge 2.5 mm ...

Page 9

ATS625LSG Relative Timing Accuracy Versus Air Gap Signature Tooth Rising Edge T = –40, 0, 25, 85, 150 (° 50, 100, 500, 1000, 1500, 2000 (rpm) 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 0.0 0.5 1.0 ...

Page 10

ATS625LSG Package Description The ATS625LSG is a combined Hall IC and rare-earth pellet configuration that is fully optimized to provide digital detec- tion of gear tooth edges. This device is integrally molded into a plastic body that has been optimized ...

Page 11

ATS625LSG Undervoltage Lockout When the supply voltage falls below the undervoltage lockout level the device switches to the OFF state. The device CCUV remains in that state until the voltage level is restored to to the V operating ...

Page 12

ATS625LSG Power-On State At power-on, the device is guaranteed to initialize in the OFF state, with V high. OUT First Edge Detection The device uses the first two mechanical edges to synchronize with the target features (tooth or valley) and ...

Page 13

ATS625LSG AGC (Automatic Gain Control) The AGC feature is implemented by a unique patented self- calibrating circuitry. After each power-on, the device measures the peak-to-peak magnetic signal. The gain of the circuit is then Differential Electrical Signal versus Target Rotation ...

Page 14

ATS625LSG SWITCHPOINTS Switchpoints in the ATS625 are a percentage of the amplitude of the signal after normalization with AGC. In operation, PROC the actual switching levels are determined dynamically. Two DACs track the peaks of V (see the ...

Page 15

ATS625LSG Magnetic Profile In order to establish the proper operating specification for a par- ticular IC and target system, a systematic evaluation of the mag- netic circuit should be performed. The first step is the generation of a magnetic map ...

Page 16

ATS625LSG ACCURACY While the update algorithm will allow the device to adapt to typical air gap variations, major changes in air gap can adversely affect switching performance. When characterizing IC perfor- mance over a significant air gap range, be sure ...

Page 17

ATS625LSG THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional information is available on the Allegro Web site. True Zero-Speed Low-Jitter High Accuracy Power Derating Symbol Test Conditions* Minimum-K PCB (single layer, single-sided, ...

Page 18

ATS625LSG The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating sup- plied power or improving the heat dissipation properties of the application. ...

Page 19

ATS625LSG ESD – Human Body Model ESD – Machine Model Conducted Transients Direct RF Injection Bulk Current Injection TEM Cell *Please contact Allegro MicroSystems for EMC performance True Zero-Speed Low-Jitter High Accuracy Device Evaluation: EMC Characterization Only Test Name* Reference ...

Page 20

ATS625LSG 1.10 F 8.00±0.05 5.80±0.05 E1 1.70±0.10 4.70±0. 24.65±0.10 15.30±0.10 A 5.50±0.10 True Zero-Speed Low-Jitter High Accuracy Package SG, 4-Pin SIP 5.50±0.05 1. Branded E2 Face 0.71±0.05 0.60±0.10 0.40±0.10 1.0 REF 1.60±0.10 0.71±0.10 ...

Page 21

ATS625LSG Copyright ©2005-2009, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,264,783; 5,389,889; 5,442,283; 5,517,112; 5,581,179; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; 6,091,239; 6,100,680; 6,232,768; 6,242,908; 6,265,865; 6,297,627; 6,525,531; ...

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