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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MICRF620Z датащи(PDF) 18 Page - Micrel Semiconductor |
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MICRF620Z датащи(HTML) 18 Page - Micrel Semiconductor |
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18 / 21 page  Micrel, Inc. MICRF620/MICRF620Z July 2006 18 M9999-120205 If FEE = -128 and still counting dwn-pulses: 1) =>-129 = +127 2) 126 3) 125 To avoid this situation, always make sure max count is between limits. Application Circuit Illustration Figure 11. Circuit illustration of MICRF620, LDO and MCU Figure 12 shows a typical set-up with the MICRF620, a Low-Drop-Out voltage regulator (LDO) and a mikro- controller (MCU). When the MICRF620 and the MCU runs on the same power supply (min 2.0, max. 2.5V), the IO can be connected directly to the MCU. If the MCU needs a higher VDD than the max. specified VDD of the MICRF620 (2.5V), voltage dividers need to be added on the IO lines not to override the max. input voltage. Figure 11 shows a recommended voltage divider circuit for a MCU running at 3.0V and the MICRF620 at 2.5V. 3k3 18k 3k3 18k 3k3 18k 15k MICRF6xx MCU CS SCLK IO DATAIXO DATACLK LD RSSI CS SCLK IO DATAIXO DATACLK LD RSSI Figure 12. How to connect MICRF620 (2.5V) and MCU (3.0V) |
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