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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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INTEDG датащи(PDF) 344 Page - Microchip Technology |
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INTEDG датащи(HTML) 344 Page - Microchip Technology |
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344 / 478 page  PIC16(L)F1946/47 DS41414D-page 344 2010-2012 Microchip Technology Inc. 27.5 LCD Bias Internal Reference Ladder The internal reference ladder can be used to divide the LCD bias voltage two or three equally spaced voltages that will be supplied to the LCD segment pins. To create this, the reference ladder consists of three matched resistors. Refer to Figure 27-3. 27.5.1 BIAS MODE INTERACTION When in 1/2 Bias mode (BIASMD = 1), then the middle resistor of the ladder is shorted out so that only two voltages are generated. The current consumption of the ladder is higher in this mode, with the one resistor removed. TABLE 27-3: LCD INTERNAL LADDER POWER MODES (1/3 BIAS) 27.5.2 POWER MODES The internal reference ladder may be operated in one of three power modes. This allows the user to trade off LCD contrast for power in the specific application. The larger the LCD glass, the more capacitance is present on a physical LCD segment, requiring more current to maintain the same contrast level. Three different power modes are available, LP, MP and HP. The internal reference ladder can also be turned off for applications that wish to provide an external ladder or to minimize power consumption. Disabling the internal reference ladder results in all of the ladders being disconnected, allowing external voltages to be supplied. Whenever the LCD module is inactive (LCDA = 0), the internal reference ladder will be turned off. Power Mode Nominal Resistance of Entire Ladder Nominal IDD Low 3 Mohm 1 µA Medium 300 kohm 10 µA High 30 kohm 100 µA |
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