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SI4020 Datasheet(PDF) 9 Page - Silicon Laboratories |
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SI4020 Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 32 page Si4020 9 Note 1: Using a CR2032 battery (225 mAh capacity), the expected battery life is greater than 2 years using a 60-second wake-up period for sending 100 byte packets in length at 19.2 kbps with +3 dBm output power in the 915 MHz band. Note 2: Using anything but a 10 MHz crystal is allowed but not recommended because all crystal-referred timing and frequency parameters will change accordingly. Note 3: Adjustable in 8 steps. Note 4: Optimal antenna admittance/impedance for the Si4020: Yantenna [S] Zantenna [Ohm] Lantenna [nH] 315 MHz 9.4E-4 - j4.5E-3 43 + j214 112.00 434 MHz 8.4E-4 - j6.25E-3 21 + j157 59.00 868 MHz 1.15E-3 - j1.2E-2 7.9 + j83 15.30 915 MHz 1.2E-3 - j1.25E-2 7.6 + j79 13.90 Note 5: With selective resonant antennas (see: Application Notes available from http://www.silabs.com/integration). Note 6: During this period, no commands are accepted by the chip. For detailed information see the Reset modes section. Note 7: The crystal oscillator start-up time strongly depends on the capacitance seen by the oscillator. Using low capacitance and low ESR crystal is recommended. When designing the PCB layout keep the trace connecting to the crystal short to minimize stray capacitance. |
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