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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ACS70331 датащи(PDF) 13 Page - Allegro MicroSystems |
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ACS70331 датащи(HTML) 13 Page - Allegro MicroSystems |
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13 / 26 page  High Sensitivity, 1 MHz, GMR-Based Current Sensor IC in Space-Saving, Low Resistance QFN and SOIC-8 Packages ACS70331 13 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Gain and Offset Trim The bridge configuration of the GMR elements in the ACS70331 make the gain and offset trim for the sensor relatively simple. As the bridge output voltage is proportional to the voltage driving it, that voltage is trimmed to compensate for all other nominal gain errors, as well as errors over temperature. Then, offset is trimmed out after the bridge voltage has been amplified. All trim codes are stored using fuses that are programmed at final test before lock- ing the part. Ideal Output Transfer Curve The ideal output of the ACS70331 is: VIOUT = Sens × IP + VIOUT(Q) Different versions of the ACS70331 have different sensitivity (Sens) and zero current output voltage (VIOUT(Q)) values in order to give different current measurement ranges. Unidirectional sensors start at 0.25 V with zero current through the primary and swing +2 V for full-scale current. Bidirectional sensors start at 1.5 V with zero current through the primary and swing ±1 V for full-scale current. Figure 4 shows the ideal output transfer curves for each version of the ACS70331. The output curves show the typical saturation levels; however, the saturation could occur anywhere beyond the min/max saturation limits shown by the dashed lines. The stated accuracy of the sensor is only valid over the given current sensing range (IPR). 3 2.5 2 1.5 1 0.5 0 -6 -4 -2 0 2 4 6 IP (A) 2.5 Unidirectional 2.5 Bidirectional 5 Unidirectional 5 Bidirectional Vsat-high Vsat-low Figure 4: Ideal Output Tranfer Curves |
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