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32186 Datasheet(PDF) 501 Page - Renesas Technology Corp |
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32186 Datasheet(HTML) 501 Page - Renesas Technology Corp |
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501 / 1032 page  11 A/D CONVERTER 11-3 32185/32186 Group Hardware Manual Rev.1.10 REJ09B0235-0110 May 15, 07 11.1 Outline of A/D Converter (7) Inflow Current Bypass Circuit If an overvoltage or negative voltage is applied to any analog input channel which is currently inactive, a current flows into or out of the analog input channel currently being A/D converted via the internal circuit, causing the conversion accuracy to degrade. To solve this problem, the A/D Converter incorporates a circuit that bypasses such inflow current. This circuit is always enabled. (8) Conversion Speed The A/D conversion speed is shown in Table 11.1.1 below. The A/D conversion speed is decided by select- ing combination such as with or without Sample-and-Hold and selecting Normal or Fast Sample-and-Hold, selecting Slow or Fast mode, selecting Normal or Double speed. Conversion speed of comparator mode is decided by selecting combination such as selecting Slow or Fast mode, selecting Normal or Double speed. (9) Interrupt Request and DMA Transfer Request Generation Functions An A/D conversion interrupt or DMA transfer request can be generated each time A/D conversion (single mode operation, single-shot scan operation or one cycle of continuous operation) or comparate operation is completed. Note 1: To discriminate between the comparison performed internally by the successive approximation-type A/D Converter and that performed in comparator mode using the same A/D Converter as a comparator, the comparison in comparator mode is referred to in this manual as “comparate.” Table 11.1.1 outlines the A/D Converter and Figure 11.1.1 shows block diagram of A/D Converter. Table 11.1.1 Outline of the A/D Converter (1/2) Item Description Analog input 16 channels x 1 A/D conversion method Successive approximation method Resolution 10 bits (Conversion result can be read out in either 8 or 10 bits) Absolute accuracy Sample-and-hold is disabled Slow mode Normal speed ± 2LSB (Note 1) Double speed ± 2LSB (Note 2) Fast mode Normal speed ± 3LSB Double speed ± 3LSB Normal Sample-and-hold is enabled, Slow mode Normal speed ± 2LSB Simultaneous sampling is disabled Double speed ± 2LSB Fast mode Normal speed ± 3LSB Double speed ± 3LSB Fast Sample-and-hold is enabled, Slow mode Normal speed ± 3LSB Simultaneous sampling is disabled Double speed ± 3LSB Fast mode Normal speed ± 3LSB Double speed ± 8LSB Normal Sample-and-hold is enabled, Slow mode Normal speed ± 3LSB Simultaneous sampling is enabled Double speed ± 3LSB Fast mode Normal speed ± 3LSB Double speed ± 3LSB Fast Sample-and-hold is enabled, Slow mode Normal speed ± 3LSB Simultaneous sampling is enabled Double speed ± 3LSB Fast mode Normal speed ± 3LSB Double speed ± 8LSB |
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