SLAAEI3 February   2024 MSPM0C1103 , MSPM0C1103-Q1 , MSPM0C1104 , MSPM0C1104-Q1 , MSPM0G1105 , MSPM0G1106 , MSPM0G1107 , MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G3105 , MSPM0G3105-Q1 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3505 , MSPM0G3505-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1 , MSPM0G3519 , MSPM0L1105 , MSPM0L1106 , MSPM0L1227 , MSPM0L1228 , MSPM0L1228-Q1 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346 , MSPM0L2227 , MSPM0L2228 , MSPM0L2228-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Relationship Between I, C and t
  5. 2Application Scenarios
  6. 3Derivation of Formulas
  7. 4Experimental Verification
    1. 4.1 Test Environment Setup
    2. 4.2 The Result of Experiment
  8. 5Notes

4.2 The Result of Experiment

The Figure 4-3 is the experimental result of operating current of MCU run in run0 mode. Both EnergyTrace and direct measurement are all show the run0 current is around 1.5mA.

GUID-9A3E852E-BE55-499A-9909-A8C001544BC9-low.png Figure 4-3 Operating Current of MCU in run0 Mode

The power supply of MCU2 was monitored using a logic analyzer and the results are shown in the figure. Channel 1 identifies the GPIO port, and when set to low, MCU1's GPIO is in a high-impedance condition, and MCU2 is powered only by capacitors. Channel 2 is the voltage on both sides of the capacitor, which is the supply voltage of the MCU. As can be seen from the figure, when the voltage drops from 3.3 V to 1.61 V, the duration is about 2.66ms, which is close to the theoretical calculation of 2.56 ms.

GUID-40A39705-B8E2-4B38-8BC3-02CB8BF549D8-low.png Figure 4-4 The Operating Time of MCU in run0 Mode

Table 4-1 shows a table summary of the working time of different capacitors in each operating mode.

Table 4-1 Summary of Test Result in Different Operating Mode
Capacitors STOP0 I=0.32mA RUN0 I=1.5mA
Type Capacitance Measurement Time Calculation Time Measurement Time Calculation Time
Tantalum capacitors
TAJA225K010RNJ		 2.2μF 12.01ms 11.55ms 2.66ms 2.56ms
Tantalum capacitors
TAJA475K010RNJ		 4.7μF 23.29ms 24.68ms 5.10ms 5.48ms
Tantalum capacitors
TAJA106K010RNJ		 10μF 56.72ms 56.00ms 12.33ms 11.67ms
Electrolytic capacitors
ASLI-D37		 10μF 53.79ms 56.00ms 11.35ms 11.67ms
Electrolytic capacitors
ASLI-E13		 40μF 278.95ms 263.2ms 57.59ms 54.33ms
Ceramic capacitors
GRM21BR61A		 2μF 12.15ms 11.2ms 12.15ms 11.20ms
Ceramic capacitors
GRM21BR61A		 4.3μF 22.76ms 22.58ms 4.88ms 5.02ms
Ceramic capacitors
GRM21BR61A		 6.3μF 34.08ms 33.08ms 7.30ms 7.35ms

As can be seen from the table, the theoretical calculated value is basically consistent with the actual measurement. The reasons for some errors can be: capacitance error value; There is a leakage condition in the meter pen; Cable resistance, energy dissipation, etc. But, the error is within a reasonable range.