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PC87366 Scheda tecnica(PDF) 194 Page - National Semiconductor (TI) |
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PC87366 Scheda tecnica(HTML) 194 Page - National Semiconductor (TI) |
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194 / 240 page ![]() 11.0 Voltage Level Monitor (VLM) (Continued) 194 www.national.com 11.7.2 Measuring Out of Range Positive and Negative Voltages Only voltages within the range of 0V to 2.45*VREF can be measured by the module. To measure voltages out of this range, any of the external measurement pins can be used, with the addition of external resistors that should be used as voltage dividers. (See Figure 40.) Table 52. Delay Setting Example External Elements Delay Time (nS) RSOURCE [K Ω] CP [pF] 5 0.1 15 1 110 10 900 30 3200 27.5 0.1 25 1 210 10 2220 30 7900 50 0.1 45 1 430 10 3350 30 11400 Figure 40. Measurement of Positive and Negative Voltages R1 VIN (12V) R2 AVI R1 R2 AVI VIN (-12V) AVDD AVSS AVSS |
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