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PC87365 Datasheet(PDF) 168 Page - National Semiconductor (TI) |
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PC87365 Datasheet(HTML) 168 Page - National Semiconductor (TI) |
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168 / 215 page  9.0 Voltage Level Monitor (VLM) (Continued) 168 www.national.com 9.7.2 Measuring Out of Range Positive and Negative Voltages Only voltages within the range of 0V to (2.45 ±0.05)*V REF 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 volt- age dividers. (See Figure 32.) 9.7.3 Obtaining the Specified VLM/TMS Accuracy To obtain the specified VLM/TMS accuracy, see Section 10.5.5 on page 183: 27.5 0.1 25 1 210 10 2220 30 7900 50 0.1 45 1 430 10 3350 30 11400 Table 50. Delay Setting Example External Elements Delay Time (ns) RSOURCE [K Ω] CP [pF] Figure 32. Measurement Out of Positive and Negative Voltages R1 VIN (12V) R2 AVI R1 R2 AVI VIN (-12V) AVDD AVSS AVSS |
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