SWRA499C June   2016  – September 2019 CC1352P , CC1352R , CC2640 , CC2640R2F , CC2642R , CC2642R-Q1 , CC2650 , CC2652P , CC2652R , CC2652R7 , CC2652RB , CC2652RSIP

 

  1.   Running Bluetooth Low Energy on CC13x2/CC26xx Without a 32 kHz Crystal
    1.     Trademarks
    2. 1 Introduction
    3. 2 Requirements
      1. 2.1 Bluetooth Low Energy (BLE)-Stack Software Versions
      2. 2.2 Constraints
    4. 3 Configuration
      1. 3.1 Hardware Configuration
      2. 3.2 Software Configuration
    5. 4 Performance
      1. 4.1 Current Consumption
    6. 5 Recommendations
    7. 6 References
  2.   Revision History

5 Recommendations

Use of the 32 kHz crystal-less feature should be considered for the following Bluetooth Low Energy operating conditions:

  • Where the lowest possible BOM cost is desired or when board layout space is limited.
  • Peripheral role devices (slave) that maintain short (fast) connection intervals or enter Bluetooth Low Energy connections infrequently and remain idle or advertising most of the time. Example devices include door locks, light bulbs, blood glucose meters (BGMs) and fitness/activity trackers.
  • Beacon or broadcast role devices. These devices do not typically form connections and spend most of the time performing Bluetooth Low Energy advertising. These devices will achieve better (lower) current consumption with the RCOSC_LF than using an external 32 kHz crystal.