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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F722-E/ML датащи(PDF) 51 Page - Microchip Technology |
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PIC16F722-E/ML датащи(HTML) 51 Page - Microchip Technology |
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51 / 302 page  © 2009 Microchip Technology Inc. DS41341E-page 51 PIC16F72X/PIC16LF72X 5.0 LOW DROPOUT (LDO) VOLTAGE REGULATOR The PIC16F72X devices differ from the PIC16LF72X devices due to an internal Low Dropout (LDO) voltage regulator. The PIC16F72X contain an internal LDO, while the PIC16LF72X do not. The lithography of the die allows a maximum operating voltage of 3.6V on the internal digital logic. In order to continue to support 5.0V designs, a LDO voltage regulator is integrated on the die. The LDO voltage regulator allows for the internal digital logic to operate at 3.2V, while I/O’s operate at 5.0V (VDD). The LDO voltage regulator requires an external bypass capacitor for stability. One of three pins, denoted as VCAP, can be configured for the external bypass capacitor. It is recommended that the capacitor be a ceramic cap between 0.1 to 1.0 µF. The VCAP pin is not intended to supply power to external loads. An external voltage regulator should be used if this functionality is required. In addition, external devices should not supply power to the VCAP pin. On power-up, the external capacitor will look like a large load on the LDO voltage regulator. To prevent erroneous operation, the device is held in Reset while a constant current source charges the external capacitor. After the cap is fully charged, the device is released from Reset. For more information, refer to Section 23.0 “Electrical Specifications”. See Configuration Word 2 register (Register 8-2) for VCAP enable bits. |
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