Power consumption comparison

Posted 2020-10-31 荷树栋

Here is my draft evaluation when old MCU replacement for power consumption.

The current calculation is based on average of one bit communication. One bit communication total time is 48.868 ms, 28.868 ms for communication, 20 ms for idle.

All current use the typical value.

PIC works in 1MHZ.  The working normal without ADC is 2.7 mA at 4MH, the ADC without reference is 180 uA, the Sleep is 1.0 uA.  

Three times ADC sampling of each bit for first 13 bits. One ADC sampling will continue 6 us (0.006 ms).  

(2700 uA x 28.868 ms / 4M + 1.5 uA x 20 ms + 3 times x 0.006 ms x 13 x 180 uA )  / 48.868 ms = (19485.9 uA *ms + 30 uA * ms + 42.12 uA * ms)/48.868 ms= 410.17 uA

 

MS430 works in 1MHZ at AM mode, the sleep mode is LPM3 (ACLK shall be enabled when the GPIO interrupt needed).

ADC is used too, 6us sampling time for each ADC too.

(390 uA x 28.868 ms + 0.9 uA x 20 ms + 3 times x 0.006 ms x 13 x 600 uA )  / 48.868 ms = (11258.5 uA *ms + 18 uA * ms + 140.4 uA * ms)/48.868 ms= 233.6 uA

In conclusion, MS430 is better than PIC16C715.