ATS632LSC

HALL-EFFECT

GEAR-TOOTH SENSOR

SUBASSEMBLY

APPLICATIONS INFORMATION

Recommended Evaluation Technique. The self-

calibrating feature of the ATS632LSC requires that a

special evaluation technique be used to measure its high-

accuracy performance capabilities. Installation inaccura-

cies are calibrated out at power on; hence, it is extremely

important that the device be re-powered at each air gap

when gathering timing accuracy data.

Self-Calibrating Functions. This subassembly is

designed to minimize performance variation caused by

the large air gap variations resulting from installation by

self-calibrating at power-on. It is also designed to mini-

mize performance variation caused by the smaller, slower

air gap changes resulting from temperature change and

gear run-out during continuous operation by updating the

self-calibration periodically (after every 64 output pulses) if

necessary. These two functions should be tested using

the following procedure.

1.

Set the air gap to the desired value.

2.

Power down and then power on the device.

3.

Rotate the target at the desired speed.

4.

Wait for calibration to complete (16 output pulses to

occur).

5.

Monitor output for correct switching and measure

accuracy.

6.

Repeat the above for multiple air gaps within the

operating range of the device.

7.

This can be repeated over the entire temperature

range.

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

48

-55

°C to +150°C

ESD,

CDF-AEC-Q100-002

Pre/Post

3 per

Test to failure

Human Body Model

Reading

test

All leads > 8 kV