5.2 Observe ADC Functionality and Current
Consumption in Data Visualizer
Open the Data Visualizer by clicking the Data Visualizer tab to
observe the ADC functionality and power consumption, as shown in the figure below.Figure 5-1. ADC Data Print to USART Terminal and
Power Analysis
As shown in terminal 0 in Figure 6-5, the ADC result is printed in the same manner as in previous
assignment. When rotating the potmeter knob, the print ADC result changes in the same manner.
The functionality of this assignment remains the same as the previous one.
When looking at the current consumption in the power analysis window, the
average current is constant 1.32 μA when rotating potmeter knob. In comparison, the average
current consumption is about 4.5 μA in the previous assignment. There are two factors which
contribute to this current consumption reduction:
The average current consumption is around
4.0 μA when the digital input buffer on all I/O pins is disabled.
The average current is further reduced
from 4.0 μA to 1.32 μA when the USART TX pin is configured as input during the no ADC data
transmission period and only configured as output during the ADC data transmission.
This is a significant reduction of the average current from 3.7 μA to 109 μA in
the previous assignment to 1.3 μA in this assignment. The high peak glitches are about 690 μA,
the same level as in the previous assignment. It refers to the current consumed for the ADC
conversion and USART transmission.
Result: Average
current consumption has been reduced significantly from 4.5 μA in the previous assignment to
1.32 μA by disabling the digital input buffer on all I/O pins and by configuring the USART TX
pin as input during the no data transmission period.
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