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PS081 Datasheet(PDF) 83 Page - ams AG |
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PS081 Datasheet(HTML) 83 Page - ams AG |
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83 / 155 page  acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de 4-26 1 PSØ81 4.6 Power Supply For a good measurement quality it is mandatory to follow some rules for the power supply. There are several supply areas in the chip, VCC_LOAD, VCC_CORE and VCC_LCD. It is necessary to feed them with voltages decoupled by low-pass filters. Furhter, those pins need sufficient blocking capacitance mounted close to the chip. Figure 4.21 Power supply In case of solar applications without any additional battery it is necessary to implement a power-up circuit. It provides a good start-up behaviour when the scale comes from total darkness. A solar panel delivers only a few microampere at poor light conditions and still has to start up the circuit. The following figure shows a power-up circuit that is optimized for kitchen scales. To start up the scale it needs only about 3 µA @ 3.6 V. For other applications it might be necessary to change some values of the components. Figure 4.22 Power-up Circuit Member of the ams Group |
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