Self-Calibrating TPOS Gear Tooth Sensor ICs
Optimized for Automotive Cam Sensing Applications
ATS673 and
ATS674
11
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
AGC (Automatic Gain Control)
The AGC feature is implemented by a unique patented self-
calibrating circuitry. After each power-on, the devices measure
the peak-to-peak magnetic signal. The gain of the IC is then
adjusted, keeping the internal signal amplitude constant over the
air gap range of the device. This feature ensures that operational
characteristics are isolated from the effects of changes in AG.
The effect of AGC is shown in figure 7.
Magnetic Flux Density Versus Target Edge Position
0    10    20    30    40    50    60    70    80    90
Target Rotation (?
0
100
200
300
400
500
600
1.50
AG (mm):
2.00
2.50
3.00
3.50
Target Rotation (?
Internal Analog Signal after AGC Versus Target Edge Position
0    10    20    30    40    50    60    70    80    90
0
0.5
1.0
1.5
2.0
1.50
AG (mm):
2.00
2.50
3.00
3.50
Figure 7. Effect of AGC. The upper panel shows the magnetic gradient detected at the Hall element, with no amplification.
The lower panel displays the corresponding internal processed signal, V
PROC
. This normalized electrical signal allows optimal
performance by the rest of the circuits that reference this signal.
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