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SH7018 Datasheet(PDF) 292 Page - Renesas Technology Corp |
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SH7018 Datasheet(HTML) 292 Page - Renesas Technology Corp |
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292 / 431 page  276 13.6 Notes on Use The following points should be noted when using the A/D converter. 13.6.1 Analog Voltage Settings Analog Input Voltage Range: The voltage applied to analog input pins during A/D conversion should be in the range AV SS ≤ ANn ≤ AVCC (n = 0 to 7). AV CC and AVSS input voltages: For the AVCC and AVSS input voltages, set AVCC = 3.3 V ± 10%, and AV SS = VSS. When the A/D converter is not used, set AVCC = VCC and AVSS = VSS. 13.6.2 Handling of Analog Input Pins To prevent damage from surges and other abnormal voltages at the analog input pins (AN0 to AN7), connect a protection circuit such as that shown in figure 13.8. This circuit also includes a CR filter function that suppresses error due to noise. The circuit shown here is only a design example; circuit constants must be decided on the basis of the actual operating conditions. Figure 13.9 shows an equivalent circuit for the analog input pins, and table 13.5 summarizes the analog input pin specifications. SH7018 AVcc AN0 to AN7 AVss 100 Ω * Note: 0.1 µF 10 µF 0.01 µF Figure 13.8 Example of Analog Input Pin Protection Circuit |
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