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MC9S12DB128BCPV

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File Size : 116 KB Manufacturer:FREESCALE Description:The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display from a mov- ing dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation of the whole system from less than 3V. The circuit contains its own adjustable reference and accu- rate 10-step voltage divider. The low-bias-current input buffer accepts signals down to ground, or V−, yet needs no protection against inputs of 35V above or below ground. The buffer drives 10 individual comparators referenced to the precision divider. Indication non-linearity can thus be held typically to 1⁄2%, even over a wide temperature range. Versatility was designed into the LM3914 so that controller, visual alarm, and expanded scale functions are easily added on to the display system. The circuit can drive LEDs of many colors, or low-current incandescent lamps. Many LM3914s can be chained to form displays of 20 to over 100 seg- ments. Both ends of the voltage divider are externally avail- able so that 2 drivers can be made into a zero-center meter. The LM3914 is very easy to apply as an analog meter circuit. A 1.2V full-scale meter requires only 1 resistor and a single 3V to 15V supply in addition to the 10 display LEDs. If the 1 resistor is a pot, it becomes the LED brightness control. The simplified block diagram illustrates this extremely simple ex- ternal circuitry. When in the dot mode, there is a small amount of overlap or fade (about 1 mV) between segments. This assures that at no time will all LEDs be OFF, and thus any ambiguous dis- play is avoided. Various novel displays are possible.


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	1PCS	100PCS	1K	10K
价格


型号：MC9S12DB128BCPV 厂家：FREESCALE 封装：3000 批号：07+ 数量：LQFP112 说明：


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