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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST62T00C датащи(PDF) 70 Page - STMicroelectronics |
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ST62T00C датащи(HTML) 70 Page - STMicroelectronics |
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70 / 100 page  ST6200C/ST6201C/ST6203C 70/100 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 10.5.4 RC Oscillator The ST6 internal clock can be supplied with an external RC oscillator. Depending on the RNET value, the accuracy of the frequency is about 20%, so it may not be suitable for some applications. Notes: 1. Data based on characterization results, not tested in production. These measurements were done with the OSCin pin unconnected (only soldered on the PCB). 2. RNET must have a positive temperature coefficient (ppm/°C), carbon resistors should therefore not be used. Figure 45. Typical Application with RC Oscillator Symbol Parameter Conditions Min Typ Max Unit fOSC RC oscillator frequency 1) RNET=22 kΩ RNET=47 kΩ RNET=100 kΩ RNET=220 kΩ RNET=470 kΩ 7.2 5.1 3.2 1.8 0.9 8.6 5.7 3.4 1.9 0.95 10 6.5 3.8 2 1.1 MHz RNET=22 kΩ RNET=47 kΩ RNET=100 kΩ RNET=220 kΩ RNET=470 kΩ 3.7 2.8 1.8 1 0.5 4.3 3 1.9 1.1 0.55 4.9 3.3 2 1.2 0.6 RNET RC Oscillator external resistor 2) see Figure 46 & Figure 47 22 870 k Ω OSCIN OSCOUT RNET EXTERNAL RC CEX~9pF DISCHARGE ST62XX VDD VDD fOSC VDD NC MIRROR CURRENT 1 |
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