115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

ATS622LSB

TRUE ZERO-SPEED,

GEAR-TOOTH SENSOR

10

CRITERIA FOR DEVICE QUALIFICATION

All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To

become qualified, except for the destructive ESD tests, no failures are permitted.

Test Method and

Samples

Qualification Test

Test Conditions

Test Length

Per Lot

Comments

Temperature Humidity

JESD22-A101,

1000 hrs

48

Device biased for

Bias Life

minimum power

Bias Life

JESD22-A108,

1000 hrs

48

(Surge Operating Life)

JESD22-A108,

168 hrs

48

Autoclave, Unbiased

JESD22-A102,

96 hrs

48

High-Temperature

JESD22-A103,

1000 hrs

48

(Bake) Storage Life

Temperature Cycle

JESD22-A104

1000 cycles

60

-55

°C to +150°C

ESD,

CDF-AEC-Q100-002

Pre/Post

3 per

Test to failure

Human Body Model

Reading

test

All leads > x kV

APPLICATIONS INFORMATION — Continued

Signal timing accuracy. The magnetic field profile

width is defined by the sensor element spacing and nar-

rows in degrees as the target diameter increases. This

results in improved timing accuracy performance for larger

gear diameters (for the same number of gear teeth).

Valley-to-tooth transistions will generally provide better

accuracy than tooth-to-valley transitions for large-tooth or

large-valley configurations. For highest accuracy, targets

greater than 100mm in diameter should be used.

Signal duty cycle. For repetitive target structures,

precise duty cycle is maintained over the operating air gap

and temperature range due to an extremely good symmetry

in the magnetic switch points and the internal self calibra-

tion of the device. For irregular tooth geometries, there

will be a small but measureable change in pulse width

versus air gap.

Additional applications Information on gear-tooth

and other Hall-effect sensors is also available in the “Hall-

Effect IC Applications Guide”, which can be found in the

latest issue of the Allegro MicroSystems Electronic Data

Book, AMS-701 or Application Note 27701, or at

www.allegromicro.com