參數(shù)資料
型號: ATS616LSGTN-T
元件分類: 速度傳感器和接近開關(guān)
英文描述: PROXIMITY SENSOR-HALL EFFECT, 0.4-2.5mm, 200-400mV, RECTANGULAR, THROUGH HOLE MOUNT
封裝: PLASTIC, SIP-4
文件頁數(shù): 2/14頁
文件大?。?/td> 444K
代理商: ATS616LSGTN-T
10
ATS616LSG-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor
ATS616LSG
AGC circuit sets the gain of the device after power-on. Up to a
0.25 mm air gap change can occur after calibration is complete
without significant performance impact.
Superior Performance.
The ATS616 peak-detecting differential
gear-tooth sensor module has several advantages over conven-
tional Hall-effect gear-tooth sensors. The signal-processing
techniques used in the ATS616 solve the catastrophic issues that
affect the functionality of conventional digital gear-tooth sen-
sors, such as the following:
Temperature drift. Changes in temperature do not greatly
affect this device due to the stable amplifier design and the
offset rejection circuitry.
Timing accuracy variation due to air gap. The accuracy varia-
tion caused by air gap changes is minimized by the self-cali-
bration circuitry. A 2×-to-3× improvement can be seen.
Dual edge detection. Because this device switches based on
the positive and negative peaks of the signal, dual edge detec-
tion is guaranteed.
Tilted or off-center installation. Traditional differential sensors
can switch incorrectly due to baseline changes versus air gap
caused by tilted or off-center installation. The peak detec-
tor circuitry references the switchpoint from the peak and is
immune to this failure mode. There may be a timing accuracy
shift caused by this condition.
Large operating air gaps. Large operating air gaps are achiev-
able with this device due to the sensitive switchpoints after
power-on (dependent on target dimensions, material, and
speed).
Immunity to magnetic overshoot. The patented adjustable
hysteresis circuit makes the ATS616 immune to switching on
magnetic overshoot within the specified air gap range.
Response to surface defects in the target. The gain-adjust
circuitry reduces the effect of minor gear anomalies that would
normally cause false switching.
Immunity to vibration and backlash. The gain-adjust circuitry
keeps the hysteresis of the device roughly proportional to the
peak-to-peak signal. This allows the device to have good im-
munity to vibration even when operating at close air gaps.
Immunity to gear run out. The differential sensor configura-
tion eliminates the baseline variations caused by gear run out.
Differential vs. Single-Element Sensing.
The differential
Hall-effect configuration is superior in most applications to the
classical single-element gear-tooth sensor. The single-element
configuration commonly used (Hall-effect sensor mounted on
the face of a simple permanent magnet) requires the detection
of a small signal (often <100 G) that is superimposed on a large
back-biased field, often 1500 G to 3500 G. For most gear/target
configurations, the back-biased field values change due to
concentration effects, resulting in a varying baseline with air
gap, valley widths, eccentricities, and vibration (figure 4). The
differential configuration (figure 5) cancels the effects of the
back-biased field and avoids many of the issues presented by the
single Hall element design.
Figure 4. Affect of varying valley widths on single-element sensors.
Figure 4. Affect of varying air gaps on differential sensors.
相關(guān)PDF資料
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