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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN1709 데이터시트(PDF) 24 Page - STMicroelectronics |
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AN1709 데이터시트(HTML) 24 Page - STMicroelectronics |
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24 / 38 page  24/38 EMC DESIGN GUIDE FOR ST MICROCONTROLLERS Figure 15. Digital Input/Output - True Open Drain Output In Figure 15. a true open-drain pin schematic is shown. In this case all paths to VDD are re- moved (P-channel driver, ESD protection diode, internal weak pull-up) in order to allow the system to turn off the power supply of the microcontroller and keep the voltage level at the pin high without injecting current in the device. This is a typical condition which can occur when several devices interface a serial bus: if one device is not involved in the communication, it can be disabled by turning off its power supply to reduce the system current consumption. When an illegal negative voltage level is applied to the Microcontroller I/O pins (both versions, push-pull and true open-drain output) the clamp diode is always present and active (see ESD protection circuitry and N-channel driver). PIN OUTPUT BUFFER N P N N INPUT BUFFER ESD PROTECTION CIRCUITRY PORT CIRCUITRY I/O CIRCUITRY P EN EN |
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