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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) 26 Page - STMicroelectronics |
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L9805 датащи(HTML) 26 Page - STMicroelectronics |
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26 / 103 page  26/103 L9805 4 VOLTAGE REGULATOR 4.1 Introduction The on chip voltage regulator provides two regu- lated voltage, nominally 5V both. VCC supplies ADC and the analog periphery and VDD supplies the microcontroller and logic parts. These voltage are available at pins VDD and VCC to supply ex- ternal components and connects a capacitors to optimize EMI performance. A pre-regulator circuit allows to connect external tantalum capacitors to a lower (10V) voltage (VB2 pin). 4.1.1 Functional Description The main supply voltage is taken from VB1 pin. A voltage pre-regulator provides the regulated volt- age on pin VB2. VB2 is the supply for the digital and analog regulators. The block diagram shows the connections between the regulators and the external pins. In order to prevent negative spikes on the battery line to propagate on the internal supply generating spurious reset, a series diode supply VB1 pin is recommended. Figure 14. Voltage regulation block diagram 4.2 Digital Section Power Supply The digital supply voltage VDD is available at pin number 42 and 9. The digital ground GND is avail- able at pin number 43 and 12. Pin 42 and 43 are the actual voltage regulator out- put and external loads must be supply by these pin. The 100nF compensation capacitor should be connected as close as possible to pin 42 and 43. Pin number 9 and 12 provide an external access to the internal oscillator supply. Resonator’s capaci- tors should be grounded on pin 12. ADC PRE-REGULATOR VB1 VB2 force ANALOG VOLTAGE REGULATOR sense VCC AGND DIGITAL VOLTAGE REGULATOR VDD(42) GND(43) Battery |
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