SWRZ136B December   2023  – July 2025 CC2340R5-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Advisories Matrix
  5. 2Nomenclature, Package Symbolization, and Revision Identification
    1. 2.1 Device and Development Support-Tool Nomenclature
    2. 2.2 Devices Supported
    3. 2.3 Package Symbolization and Revision Identification
  6. 3Advisories
    1. 3.1  SPI_04
    2. 3.2  ADC_08
    3. 3.3  ADC_09
    4. 3.4  BATMON_01
    5. 3.5  BATMON_02
    6. 3.6  CKM_01
    7. 3.7  CLK_01
    8. 3.8  I2C_01
    9. 3.9  GPIO_01
    10. 3.10 PMU_01
    11. 3.11 UART_01
  7. 4Revision History

3.6 CKM_01

Tracking loop issues during standby-wake

Revisions Affected

CC2340R53-Q1 Rev B

Details

In a few corner cases, the HFOSC tracking loop stops working out of standby, with TRACKREFLOSS getting set, indicating that the selected reference clock of the tracking loop is lost.

Workaround

The standby entry sequence includes disabling software override and clearing CKM LDO control bits. These writes have to be sequenced such that the software override is cleared first, and then the LDOCTL bits are all set to zero.

If these settings occur in parallel, the tracking loop is seen to get stuck in a few cases.

The workaround has been implemented within the power drivers and is a part of the 9.10 SDK release.