4 Summary

By using the Sensor Controller, ultra-low power consumption can be achieved when using different sensors. This table summarizes the current measurements for the BOOSTXL-ULPSENSE examples in Sensor Controller Studio.

The sensors found on the LPSTK-CC1352R also showed low power capabilities. Note that these numbers include the minimal standby current for the unused sensors, since the sensors on the LPSTK-CC1352R board cannot be powered off.

When comparing the Sensor Controller to the System CPU, the Sensor Controller has significantly lower current consumption.

The different examples shown in this application report use many different techniques to reduce the power consumption. Some ways that low power consumption can be achieved are shown here:

• Low-power mode instead of active mode where possible.
• Timer 2 in low-power mode instead of TDC, where possible.
• SPI instead of I2C, where possible.
• Timer 2 at 32 kHz to power up the sensor and then wake up the Sensor Controller (when the sensor is ready).
• Timer 2 at 2 MHz/32 kHz as pulse width modulator (PWM) for status LEDs.
• Preprocess the sensor data to detect relevant activity, and wake up the System CPU application only when needed.
• General-purpose input/output (GPIO) event handler for interrupt from digital sensor, with timeout for sensors that generate interrupt periodically.
• Minimized communication over I2C/SPI, reading multiple external device registers in one operation.
• Disable peripherals as soon as possible after measurement (before the data processing).
• Reduced sensor polling frequency when the sensor data indicate no activity.
• Reference DAC and COMPA in low-power mode can be used as low-precision ADC.