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AT90S8535 Datasheet(PDF) 74 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 74 Page - ATMEL Corporation |
74 / 127 page ![]() 74 AT90S/LS8535 1041H–11/01 • ADC9..0: ADC Conversion result These bits represent the result from the conversion. $000 represents analog ground and $3FF represents the selected reference voltage minus one LSB. Scanning Multiple Channels Since change of analog channel always is delayed until a conversion is finished, the Free Running Mode can be used to scan multiple channels without interrupting the con- verter. Typically, the ADC Conversion Complete interrupt will be used to perform the channel shift. However, the user should take the following fact into consideration: The interrupt triggers once the result is ready to be read. In Free Running Mode, the next conversion will start immediately when the interrupt triggers. If ADMUX is changed after the interrupt triggers, the next conversion has already started and the old setting is used. ADC Noise Canceling Techniques Digital circuitry inside and outside the AT90S8535 generates EMI that might affect the accuracy of analog measurements. If conversion accuracy is critical, the noise level can be reduced by applying the following techniques: 1. The analog part of the AT90S8535 and all analog components in the application should have a separate analog ground plane on the PCB. This ground plane is connected to the digital ground plane via a single point on the PCB. 2. Keep analog signal paths as short as possible. Make sure analog tracks run over the analog ground plane and keep them well away from high-speed switching digital tracks. 3. The AV CC pin on the AT90S8535 should be connected to the digital VCC supply voltage via an LC network as shown in Figure 50. 4. Use the ADC noise canceler function to reduce induced noise from the CPU. 5. If some Port A pins are used as digital outputs, it is essential that these do not switch while a conversion is in progress. Figure 50. ADC Power Connections PA4 (ADC4) PA5 (ADC5) PA6 (ADC6) PA7 (ADC7) AREF AVCC AGND PC0 39 35 37 33 32 38 34 36 43 41 42 40 44 1 |
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