SWRZ062F September   2015  – December 2022 CC1310

 

  1.   CC1310 SimpleLink™ Ultra-Low-Power Sub-1 GHz Wireless MCU Silicon Revisions B, A
  2.   Trademarks
  3. 1Advisory Matrix
  4. 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
  5. 3Silicon Revision B Advisories
    1.     Advisory 02
    2.     Advisory 03
    3.     Advisory 04
    4.     Advisory 05
    5.     Advisory 06
    6.     Advisory 07
    7.     Advisory 08
    8.     Advisory 09
    9.     Advisory 10
    10.     Advisory 11
    11.     Advisory 12
    12.     Advisory 13
    13.     Advisory 14
    14.     Advisory 15
    15.     Advisory 16
    16.     Advisory 17
    17.     Advisory 18
    18.     Advisory 19
  6. 4Silicon Revision A Advisories
    1.     Advisory 01
  7. 5Revision History

Advisory 12

Slow Transition Across Brown-Out Detect (BOD) Threshold Might Cause the Device to Hang

Revision Affected:

A and B

Details:

For applications using non-rechargeable (primary) battery, the issue described in this advisory would potentially occur only at end-of-life of the battery, and therefore a workaround is not necessary as the battery would anyway need to be replaced, triggering a power-on reset.

If the VDDS supply voltage is held in the BOD threshold region (approximately 1.78 V), the device might on rare occasions end up in a lock-up state. The current draw is approximately 2.25 mA in this state. The device will not exit this state by increasing the VDDS supply voltage above the BOD threshold. To get out of this state, a pin reset must be performed or the VDDS supply voltage must be decreased below the power-on reset (POR) threshold (1.0 V), triggering a POR reset.

The lock-up state is triggered if a brown-out-detect (BOD) event occurs during specific stages of the boot code execution. There are two critical, narrow time windows, each of approximately 10 ns duration, and both of these time windows occur within 100 µs to 1 ms after the reset event that started the boot code execution. Typically, this can happen when the supply voltage is ramped slowly across the BOD threshold. Supply resistance, in combination with device startup current will then pull the VDDS supply voltage below the BOD threshold multiple times as the device turns on and off due to resets.

For Li-Ion and NiMH rechargeable batteries, a first level protection disconnecting the chip VDDS supply would typically prevent the device from entering this state during battery discharge as the device power supply would fall below the POR threshold.

Workaround:

The following workarounds must be implemented:

The specified operating supply voltage range for the device is 1.8 V to 3.8 V. When using rechargeable batteries, the battery protection system must ensure that either:

  • The device supply voltage remains at or above the minimum operating supply voltage (1.8 V) once powered on, or
  • If the device supply is discharged below the minimum operating supply voltage (1.8 V), the device must be reset (pin or power-on reset) when the supply is charged above the minimum operating supply voltage (1.8 V) again.