SWRU455M February 2017 – October 2020 CC3120 , CC3120MOD , CC3130 , CC3135 , CC3135MOD , CC3220MOD , CC3220MODA , CC3220R , CC3220S , CC3220SF , CC3230S , CC3230SF , CC3235MODAS , CC3235MODASF , CC3235MODS , CC3235MODSF , CC3235S , CC3235SF
The SimpleLink device performs calibration of the Wi-Fi physical layer. The system supports three different calibration modes to optimize this process for the required use case. The default calibration mode is triggered calibration. Setting the calibration mode can be done only by the Image Creator tool during the creation of the image.
For low power applications, TI recommends choosing Triggered mode over One-Time calibration mode, unless current peak limit is an absolute constraint. Triggered mode does not issue calibrations unless absolutely necessary, or manually triggered.
Calibration failure:
When the device fails to calibrate, the device INIT complete fails, and the INIT complete async event has the error: SL_ERROR_CALIB_FAIL.
Table 5-15 describes the differences between these modes.
First Time INIT | Exit from Reset | Exit from Hibernate | TX Power Change | Calibration Assessment | Restore to Factory Defaults and Image | |
---|---|---|---|---|---|---|
Normal | Calibrate | Calibrate | No calibration | Calibrate on next power/hibernate cycle. Until the next power cycle, the power change is ignored. | Calibrate if needed (subset calibration, no peak current) | Calibration data is deleted. Calibrate on next power/hibernate cycle. |
Triggered | Calibrate | No calibration | No calibration | Calibrate on next power/hibernate cycle. Until the next power cycle, the power change is ignored. | No runtime calibration | Calibration data is deleted. Calibrate on next power/hibernate cycle. |
One Time | Calibrate | No calibration. Corrupted or missing data leads to INIT failure (lock state) but no re-calibration. | No calibration. Corrupted or missing data leads to INIT failure (lock state) but no re-calibration. | Invalid operation. In this mode, setting the TX power is allowed only by the Image Creator tool. | No runtime calibration | Calibration data is kept – no re-calibration |