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IC-TW4 Datasheet(PDF) 10 Page - IC-Haus GmbH |
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IC-TW4 Datasheet(HTML) 10 Page - IC-Haus GmbH |
10 / 14 page iC-TW4 PROGRAMMABLE INTERPOLATOR WITH AUTOMATIC OFFSET CORRECTION Rev D1, Page 10/14 Test mode [V] at CFG1 Z at CFG1 [V] at CFG2 Z at CFG2 PGA A 0.8 * VDD < 3 kΩ Refer to table 8 > 75 kΩ PGA B 0.8 * VDD > 75 kΩ Refer to table 8 > 75 kΩ Calib 1 0.87 * VDD > 75 kΩ Refer to table 8 < 3 kΩ Index cali- bration 0.87 * VDD < 3 kΩ Refer to table 8 < 3 kΩ Offset 0.87 * VDD < 3 kΩ Refer to table 8 > 75 kΩ Vc 0.87 * VDD > 75 kΩ Refer to table 8 > 75 kΩ Table 9: Test modes INDEX GATING The iC-TW4 can interface to a wide range of index gat- ing sources. Most commonly used are the digital Hall sensor and the MR sensor bridge. The digital Hall sen- sor provides a large swing input signal to the iC-TW4. Depending on the polarity of the Hall it is either con- nected to pin NINZ or PINZ. Most Hall sensors use an open drain stage pulling the output low in the presence of a magnetic field. The unused terminal NINZ or PINZ should be biased to an adequate mid voltage level to guarantee good noise margin. Refer to Figure 5 for sample configurations. NINZ sensor active low PINZ PINZ no Index VDD MR index using MR bridge VDD iC-TW4 VDD PINZ NINZ Index gating using iC-TW4 iC-TW4 NINZ Index gating VDD Digital Hall Hall sensor Figure 5: Index configuration A MR sensor differential bridge can also be used to gate the index. Typically, the MR sensor provides a small signal amplitude. In addition, residual side lobes are present that can trigger double indexing. It might be necessary to externally adjust the sensor offset in order to fine-tune the desired threshold. The iC-TW4 provides a calibration mode, which allows the internal gating window to be observed. This simplifies prod- uct calibration as variation in sensor offset can be eas- ily compensated for. Figure 6 shows a correctly set threshold when using an MR gating sensor. The side lobes are below the threshold line and no parasitic trig- gering occurs. |
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