![]() Here, the circuit is a sort of monostable arrangement with a more or less constant voltage (about 1.4V usually) on the trigger and threshold pins, which is supplied by a photodiode (a suitable LED, actually). ![]() It also blinks.Īnother application of the CSS555 in the standard (unprogrammed) mode is the solar engine shown in Figure 4. ![]() This electronic paperweight holds down papers by automatically utilizing the ambient gravity field. It blinks perpetually on the energy stored in a 1F capacitor charged from a small photovoltaic cell taking in typical desktop lighting.įIGURE 3. For example, the LED blinker in the electronic paperweight in Figure 3 uses the above astable circuit with timing resistors R A = 10M, R B = 47K, and a 0.22 ♟ timing capacitor. However, the micropower nature of this IC allows using external components with values that demand much less power. Note that the reset pin must be held high for the chip to be active. Therefore, application circuits have the familiar 555 topology as, for example, in the astable circuit illustrated in Figure 2.įIGURE 2. ![]() The CSS555 is pin-for-pin compatible with the customary 555 series timers as Figure 1 indicates.įIGURE 1. ![]() These qualities make it particularly well-suited for long lasting battery and small solar powered projects. It operates at a current under 5 ♚ and a supply voltage from 5.5V down to 1.2V. The CSS555 is a micropower programmable version of the 555 family of timer ICs. ![]()
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