データシートサーチシステム |
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LM1270N データシート(PDF) 6 Page - National Semiconductor (TI) |
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LM1270N データシート(HTML) 6 Page - National Semiconductor (TI) |
6 / 27 page Pin Descriptions (Continued) Pin No. Pin Name Schematic Description 12 H Sync Logic level horizontal sync signal received from the video card in the PC or sync stripper circuit. 13 SCL The I 2C compatible Clock line. A pull-up resistor of about 2 k Ω should be connected between this pin and V CC. A 100 Ω resistor should be connected in series with the clock line for additional ESD protection. 14 SDA The I 2C compatible data line. A pull-up resistor of about 2 k Ω should be connected between this pin and V CC. A 100 Ω resistor should be connected in series with the data line for additional ESD protection. 15 Blank/Interrupt Out This output pin can be selected for Vertical Blank, blank all the video, or no blanking. Provides the blanking signal normally used at G1 of the CRT, blanking the video during vertical retrace. If blanking is not required, this pin may be used as an interrupt signal for the microcontroller. 16 H Flyback Proper operation requires current reversal. R H should be large enough to limit the peak current at pin 16 to about +2 mA during blanking, and −300 µA during scan. C 17 is usually needed for logic level inputs and should be large enough to make the time constant, R HC17 significantly larger than the horizontal period. R Fil and CFil are typically 300 Ω and 330 pF when the flyback waveform has ringing and needs filtering. These two parts are not used on the current neck board. C 57 may be needed to filter extraneous noise and can be up to 100 pF. www.national.com 6 |
同様の部品番号 - LM1270N |
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同様の説明 - LM1270N |
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