SLAU857A May   2021  – July 2021 MSP430FR2476 , MSP430FR2512 , MSP430FR2522 , MSP430FR2532 , MSP430FR2533 , MSP430FR2632 , MSP430FR2633 , MSP430FR2672 , MSP430FR2673 , MSP430FR2675 , MSP430FR2676

 

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5.4.5 Response Speed and Power Consumption Adjustment

One that affects the response speed is the scan time, and the other is the hysteresis effect of the touch signal. The functions involved in this part are shown in Table 5-8.

Table 5-8 Response Speed Adjustment Parameters
Widget Subdirectory Function Comment
MCU widget Conversion_Control Active Mode Scan Rate ms Scan period setting of the sensor.
Noise Immunity Enable Affect the actual scan time.
Sensor widget Conversion_Control Conversion Count Too large a parameter means that the number of charge transfers increases, which affects the actual scan time.
Tuning Debounce In/Out Threshold Affect the speed of signal change.
Counter Filter Beta Affect the speed of signal change.

In addition, it is not recommended that the host use the I2C fixed cycle polling method to obtain the button status information of the MSP430, because this must ensure that the MSP430 sensor scan speed is twice the polling speed of the host, which indirectly reduces the upper limit of the button response speed of the entire system.

The longer the scan time, the faster the scan frequency means the higher the power consumption. It is recommended to use the Energytrace function provided by CAPTIVATE-PGMR to optimize the system by observing the relationship between time and power consumption. Note that the power supply pin used is 3V3 Metered. If you have higher requirements for power consumption, it is recommended to enable LPM3 mode and Wake-on-Prox mode.

EnergyTrace: A code analysis tool for optimizing power consumption, which can be used to measure and display the power consumption of an application, including software and hardware. The software part is integrated in CCS and IAR.