ATS632LSC
HALL-EFFECT
GEAR-TOOTH SENSOR
SUBASSEMBLY
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
Test Conditions
JESD22-A101,
T
A
= 85°C, RH = 85%
JESD22-A108,
T
A
= 150°C, T
J
= 165°C
JESD22-A108,
T
A
= 175°C, T
J
= 190°C
JESD22-A102,
T
A
= 121°C, 15 psig
JESD22-A103,
T
A
= 170°C
JESD22-A104
CDF-AEC-Q100-002
Samples
Per Lot
48
48
48
48
48
48
3 per
test
-55°C to +150°C
Test to failure
All leads > 8 kV
Qualification Test
Temperature Humidity
Bias Life
Bias Life
(Surge Operating Life)
Autoclave, Unbiased
High-Temperature
(Bake) Storage Life
Temperature Cycle
ESD,
Human Body Model
Test Length
1000 hrs
1000 hrs
168 hrs
96 hrs
1000 hrs
1000 cycles
Pre/Post
Reading
Comments
Device biased for
minimum power
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.
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
