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AN1709 Datasheet(PDF) 25 Page - STMicroelectronics |
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AN1709 Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 38 page  25/38 EMC DESIGN GUIDE FOR ST MICROCONTROLLERS 3.1.3.4 Internal Circuitry: Analog Input pin Figure 16. shows the internal circuitry used for analog input. It is primarily a digital I/O with an added analog multiplexer for the selection of the input channel of the Analog to Digital Con- verter (ADC). The presence of the multiplexer P-channel and N-channel can affect the behaviour of the pin when exposed to illegal voltage conditions. These transistors are controlled by a low noise logic, biased through AVDD and AVSS including P-channel N-well: it is important to always verify the input voltage value with respect to both analog power supply and digital power supply, in order to avoid unintentional current injections which (if not limited) could destroy the device. Figure 16. Digital Input/Output - Push-Pull Output - Analog Multiplexer Input PIN OUTPUT BUFFER P N P N N INPUT BUFFER P ESD PROTECTION CIRCUITRY PORT CIRCUITRY I/O CIRCUITRY P EN EN P P |
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