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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IO20PDB0V0 датащи(PDF) 122 Page - Microsemi Corporation |
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IO20PDB0V0 датащи(HTML) 122 Page - Microsemi Corporation |
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122 / 197 page  Pin Descriptions 5- 8 R ev isio n 1 2 Special Function Pins Name Type Polarity/Bus Size Description NC No connect This pin is not connected to circuitry within the device. These pins can be driven to any voltage or can be left floating with no effect on the operation of the device. DC Do not connect. This pin should not be connected to any signals on the PCB. These pins should be left unconnected. LPXIN In 1 Low power 32 KHz crystal oscillator. Input from the 32 KHz oscillator. Pin for connecting a low power 32 KHz watch crystal. If not used, the LPXIN pin can be left floating. For more information, see the PLLs, Clock Conditioning Circuitry, and On- Chip Crystal Oscillators section in the SmartFusion Microcontroller Subsystem User’s Guide . LPXOUT In 1 Low power 32 KHz crystal oscillator. Output to the 32 KHz oscillator. Pin for connecting a low power 32 KHz watch crystal. If not used, the LPXOUT pin can be left floating. For more information, see the PLLs, Clock Conditioning Circuitry, and On- Chip Crystal Oscillators section in the SmartFusion Microcontroller Subsystem User’s Guide . MAINXIN In 1 Main crystal oscillator circuit. Input to the crystal oscillator circuit. Pin for connecting an external crystal, ceramic resonator, or RC network. When using an external crystal or ceramic oscillator, external capacitors are also recommended. Refer to documentation from the crystal oscillator manufacturer for proper capacitor value. If an external RC network or clock input is used, the RC components are connected to the MAINXIN pin, with MAINXOUT left floating. When the main crystal oscillator is not being used, MAINXIN and MAINXOUT pins can be left floating. For more information, see the PLLs, Clock Conditioning Circuitry, and On-Chip Crystal Oscillators section in the SmartFusion Microcontroller Subsystem User’s Guide . MAINXOUT Out 1 Main crystal oscillator circuit. Output from the crystal oscillator circuit. Pin for connecting external crystal or ceramic resonator. When using an external crystal or ceramic oscillator, external capacitors are also recommended. Refer to documentation from the crystal oscillator manufacturer for proper capacitor value. If an external RC network or clock input is used, the RC components are connected to the MAINXIN pin, with MAINXOUT left floating. When the main crystal oscillator is not being used, MAINXIN and MAINXOUT pins can be left floating. For more information, see the PLLs, Clock Conditioning Circuitry, and On-Chip Crystal Oscillators section in the SmartFusion Microcontroller Subsystem User’s Guide . |
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