SWRA843 January   2026 CC1310

 

  1.   1
  2.   Summary
  3. 1How to port a product design from CC1310 to CC1311
    1. 1.1 Hardware porting
    2. 1.2 Software porting
      1. 1.2.1 System Configuration (SysConfig)
      2. 1.2.2 Port TI-RTOS to TI-RTOS 7
      3. 1.2.3 Peripheral driver code porting
        1. 1.2.3.1 Port PIN driver to GPIO driver
        2. 1.2.3.2 Port UART driver to UART2 driver
  4. 2How to use the CC1311/CC110L combination to implement a multi-function system at 915MHz/433MHz/345MHz
    1. 2.1 Solution overview
    2. 2.2 RF topology design recommendations and BOM
    3. 2.3 Layout design
      1. 2.3.1 CC1311 section
      2. 2.3.2 CC110L section
    4. 2.4 Test results
  5. 3Reference links

2.1 Solution overview

Today, in Sub1G group devices, 868MHz/915MHz is comparatively busier than 345MHz. When designing gateways requiring compatibility with established designs, 345MHz holds significant market share in existing solutions such as Honeywell 5800 series, 2GIG, and Qolsys. The design supports OOK modulators and switch upper limits to accommodate 433MHz within the same RF path as SPDT. For such scenarios, we recommend employing a CC1311+CC110L hybrid design to fulfill these requirements. We recommend the SPI interface between CC1311 and CC110L, and we have all the documentation for CC110L in the data sheet, including the documentation for the SPI interface (Chapter 5.5, 4-wire SPI).

The goal of this hybrid system is to use the TI 15.4 protocol stack on 868/915MHz, the CC110L supports OOK modulation of Honeywell 5800 series sensors on 345MHz. It features only two antenna paths and must comply with FCC regulations.

According to FCC 15.231, the maximum output power is 12500uV/m at 345MHz. This correlates to -13.3dBm. Even with a maximum load cycle utilization of +20dB, this yields a maximum output power of +6.7dBm, which is permissible for very short packet lengths. Longer packet lengths and output power are further reduced under FCC regulations.

The output power of CC110L at 345MHz is +12dBm, much greater than +6.7dBm. Since dual-band operation at 345MHz and 433MHz is critical, users should not need 12/14dBm output power. Therefore, 345/433MHz antennas must feature two different antenna matches. Depending on the size of the GND plane, antenna size, and location, the antenna bandwidth for small devices is typically confined to 10–20MHz range. Therefore, two antenna matches are required to cover 345MHz and 433MHz.

Under optimal antenna matching at 345MHz and 433MHz, employing a single physical antenna will yield greater radiated output power than using individual antennas. The block diagram below uses only one antenna at 345MHz and 433MHz, as the antenna will be physically large. That is, only one antenna (345/433MHz) is used instead of two 345MHz and 433MHz antennas. If two antennas can be used to handle 345MHz and 433MHz, only one SPDT switch is required.

The RF design requires an optimal output of 14dBm at 345MHz, while the RF specification mandates >10dBm at 433MHz. We recommend the following topology: