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CC1020 Low Power UHF Transceiver
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CC1020 Low Power UHF Transceiver

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

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

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Transcript

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