CC1020 Low Power UHF Transceiver

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To introduce CC1020 RF transceiver, internal configurations, and application considerations

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CC1020 Low Power UHF Transceiver

  1. 1. CC1020 Low Power UHF Transceiver <ul><li>Source: T EXAS I NSTRUMENTS </li></ul>
  2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>To introduce CC1020 RF transceiver, internal configurations, and application considerations. </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>Key features and target applications </li></ul></ul><ul><ul><li>Key parameters configurations </li></ul></ul><ul><ul><li>Typical applications and considerations </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>14 pages </li></ul></ul>
  3. 3. Key Features <ul><li>True single chip UHF RF transceiver </li></ul><ul><li>Frequency range 402 MHz - 470 MHz and 804 MHz - 940 MHz </li></ul><ul><li>High sensitivity: up to -118 dBm for a 12.5 kHz channel </li></ul><ul><li>Programmable output power </li></ul><ul><li>Low current consumption </li></ul><ul><li>No external IF filter needed </li></ul><ul><li>Low-IF receiver </li></ul><ul><li>Very few external components required </li></ul><ul><li>Digital RSSI and carrier sense indicator </li></ul><ul><li>Data rate up to 153.6 kBaud </li></ul><ul><li>OOK, FSK and GFSK data modulation </li></ul>
  4. 4. Target Applications <ul><li>Narrowband low power UHF wireless data transmitters and receivers with channel spacing as low as 12.5 and 25 kHz </li></ul><ul><li>402 / 424 / 426 / 429 / 433 / 447 / 449 / 469 / 868 and 915 MHz ISM/SRD band systems </li></ul><ul><li>AMR - Automatic Meter Reading </li></ul><ul><li>Wireless alarm and security systems </li></ul><ul><li>Home automation </li></ul><ul><li>Low power telemetry </li></ul><ul><li>Remote keyless entry </li></ul>
  5. 5. Block Diagram DIO DCLK LOCK
  6. 6. Configuration Overview <ul><li>The following key parameters can be programmed: </li></ul><ul><ul><li>Receive / transmit mode </li></ul></ul><ul><ul><li>RF output power </li></ul></ul><ul><ul><li>Frequency synthesizer key parameters: </li></ul></ul><ul><ul><ul><li>RF output frequency </li></ul></ul></ul><ul><ul><ul><li>FSK frequency separation </li></ul></ul></ul><ul><ul><ul><li>Crystal oscillator reference frequency </li></ul></ul></ul><ul><ul><li>Power-down / power-up mode </li></ul></ul><ul><ul><li>Crystal oscillator power-up / powerdown </li></ul></ul><ul><ul><li>Data rate and data format </li></ul></ul><ul><ul><li>Synthesizer lock indicator mode </li></ul></ul><ul><ul><li>Digital RSSI and carrier sense </li></ul></ul><ul><ul><li>FSK / GFSK / OOK modulation </li></ul></ul>
  7. 7. Microcontroller Interface <ul><li>The CC1020 transceiver is very easy to interface with a microcontroller. </li></ul><ul><li>The chip is configured using a four-wire SPI bus, comprising of PCLK, PDI, PDO and PSEL signals. </li></ul><ul><li>Data interfacing is done via the DCLK and DIO pins. </li></ul><ul><li>Optionally, the MCU can do data encoding / decoding. </li></ul><ul><li>Optionally, the MCU can monitor the LOCK pin for frequency lock status, carrier sense status or other status information. </li></ul><ul><li>Optionally, the MCU can read back the digital RSSI value and other status information via the 4-wire serial interface. </li></ul>Configuration interface Signal interface LOCK
  8. 8. Operation Frequency and Data Rate Configuration <ul><li>The data rate is programmable and depends on the crystal frequency and the programming of the C LOCK registers. </li></ul><ul><li>Programming the frequency word in the configuration registers (FREQ_A & FREQ_B) sets the operation frequency. </li></ul>In the frequency band 402~470MHz In the frequency band 804~940MHz
  9. 9. Receiver Configuration <ul><li>Receiver channel filter bandwidth </li></ul><ul><ul><li>The minimum value depends on baud rate, frequency separation and crystal tolerance. </li></ul></ul><ul><ul><li>The signal bandwidth must be smaller than the available receiver channel filter bandwidth. </li></ul></ul><ul><li>Receiver Sensitivity </li></ul><ul><ul><li>It depends on the channel filter bandwidth, data rate, data format, FSK frequency separation and the RF frequency. </li></ul></ul><ul><li>Received Signal Strength Indicator (RSSI) </li></ul><ul><ul><li>The digital RSSI value is ranging from 0 to 106. </li></ul></ul><ul><ul><li>The RSSI measurement can be referred to the power (absolute value) at the RF_IN pin. </li></ul></ul><ul><li>Carrier Sense </li></ul><ul><ul><li>The carrier sense signal is based on the RSSI value and a programmable threshold </li></ul></ul><ul><ul><li>This function can be used to simplify the implementation of a Carrier Sense Multiple Access (CSMA) medium access control. </li></ul></ul>
  10. 10. Automatic Power-up Sequencing <ul><li>In automatic power-up sequencing mode, the receiver can be waken up and will then check for a carrier signal. </li></ul><ul><li>If carrier sense is not detected, it returns to power-down mode. </li></ul>Power down Crystal start up PLL Start-up Receive Power down
  11. 11. Input / Output Matching Network <ul><li>When designing the impedance matching network must be matched correctly at the harmonic frequencies as well as at the fundamental tone. </li></ul>To reduce current consumption in TX for high output power levels and improve the sensitivity in RX Balun & Match
  12. 12. Typical Application Circuit Input/output matching To set the bias current PLL loop filter MCU
  13. 13. Antenna Considerations <ul><li>For low power application, the λ /4 monopole antenna is recommended due to its simplicity as well as providing the b est range. </li></ul><ul><li>In size and cost critical applications , n on-resonant monopole antennas shorter than λ /4 can be used. </li></ul><ul><li>In size critical applications, h elical antennas can be thought of as a combination of a monopole and a loop antenna . </li></ul><ul><li>Loop antennas are easy to integrate into the PCB, but are less effective due to difficult impedance matching. </li></ul>
  14. 14. Additional Resource <ul><li>For ordering CC1020 transceiver, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For more product information go to </li></ul><ul><ul><li>http://focus.ti.com/docs/prod/folders/print/cc1020.html </li></ul></ul><ul><li>For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility </li></ul>

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