SI4020 データシートの表示（PDF） - Silicon Laboratories

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SI4020

Universal ISM Band FSK Transmitter

Silicon Laboratories 

Si4020

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:

315 MHz

434 MHz

868 MHz

915 MHz

Yantenna [S]

9.4E-4 - j4.5E-3

8.4E-4 - j6.25E-3

1.15E-3 - j1.2E-2

1.2E-3 - j1.25E-2

Zantenna [Ohm]

43 + j214

21 + j157

7.9 + j83

7.6 + j79

Lantenna [nH]

112.00

59.00

15.30

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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