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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9805 датащи(PDF) 27 Page - STMicroelectronics |
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L9805 датащи(HTML) 27 Page - STMicroelectronics |
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27 / 103 page  27/103 L9805 The application board can improve noise reduction in the chip connecting directly pin 42 to pin 9 and pin 43 to pin 12 using traces as short as possible. An additional capacitor mounted close to pin 9 and 12 can lead additional improvement. 4.2.1 VDD Short Circuit Protection The output current of the digital voltage regulator is controlled by a circuit that limits it to a maximum value (IMAXVDD). When the output current exceeds this value the VDD voltage starts falling down. Ex- ternal loads must be chosen taking in account this maximum current capability of the regulator. 4.3 Analog Section Power Supply The analog supply voltage is available on VCC pin. The external 100nF compensation capacitor should be placed as close as possible to this pin and AGND pin. VCC is the reference voltage for the AD conver- sion and must be used to supply ratiometric sen- sors feeding AD inputs. Any voltage drop between VCC pin and the sensor supply pin on the applica- tion board, will cause the ADC to be inaccurate when reading the sensor’s output. 4.3.1 VCC Short Circuit Protection The output current of the analog voltage regulator is controlled by a circuit that limits it to a maximum value (IMAXVCC). When the output current exceeds this value the VCC voltage starts falling down. Ex- ternal loads must be chosen taking in account this maximum current capability of the regulator. WARNING: The pin VB2 is not short circuit pro- tected so a short circuit on this pin will destroy the device. |
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