SWRA680 November   2020 CC3100 , CC3120 , CC3135 , CC3200 , CC3220R , CC3220S , CC3220SF , CC3235S , CC3235SF

 

  1.   Abstract
  2.   Trademarks
  3. 1Crystal Oscillator Basics
    1. 1.1 Crystal Oscillator Model
  4. 2Crystal Selection
    1. 2.1 Crystal Mode of Operation
    2. 2.2 Temperature Tolerance
    3. 2.3 Aging (Long-Term Stability)
    4. 2.4 Crystal ESR
    5. 2.5 Frequency Accuracy
    6. 2.6 Drive Level
    7. 2.7 Selecting a crystal
      1. 2.7.1 Crystal Specifications
      2. 2.7.2 Recommended Crystals for the CC31xx and CC32xx
  5. 3Crystal Tuning
    1. 3.1 The importance of Crystal Tuning
    2. 3.2 Load Capacitance
    3. 3.3 Crystal Tuning With CL
  6. 4Measuring the ppm Error for the Fast Clock (High Frequency)
    1. 4.1 Setting Up for the CC3x00 Devices
    2. 4.2 Setting Up for the CC3x20 and CC3x35 Devices
    3. 4.3 Measuring ppm Frequency Error
  7. 5PCB Layout Guidelines
    1. 5.1 The 32.768-kHz Crystal (Slow Clock)
    2. 5.2 The 40-MHz Crystal (Fast Clock)
  8. 6References

2.7.2 Recommended Crystals for the CC31xx and CC32xx

Table 2-4 and Table 2-5 provide the recommended crystals to use for the CC31xx and CC32xx devices.

Table 2-4 32.768-kHz Crystals Suitable for CC31xc and CC32xx
MnF MPN ESR max [kΩ] CL [pF] Tol [ppm] Temp tol [ppm] Temp Range
[deg C]
Abracon Corporation ABS07-32.768KHZ-9-T 70 9 pf ±20 ppm ±20 ppm -40°C ~ 85°C
Abracon Corporation ABS07-32.768KHZ-T 70 12.5 pF ±20 ppm ±30 ppm -40°C ~ 85°C
Table 2-5 40-MHz Crystals Suitable for CC31xx and CC32xx
MnF MPN ESR max [Ω] CL [pF] Tol [ppm] Temp tol [ppm] Temp range
[deg C]
Epson Q24FA20H00396 40 8 pF ±30 ppm ±30 ppm -40°C to 85°C
Abracon Corportation ABM3-16.000MHZ-D2Y-T 40 18 pF ±20 ppm ±30 ppm -40°C to 85°C