DocID027290 Rev 1

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AN4635

Power consumption comparison

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6.9

Higher communication speed

While no advanced power saving features of the LPUART can be used on higher

communication speeds (as compared with regular USART peripheral), still the LPUART

simpler circuitry will result in lower power consumption (red line) compared to a full featured

USART (black line), see Figure 10.

Figure 10. Operating at 57600 baud

Baud rate

9600

SW used

Interrupt operation (Com IT) with defines RXSTOP and TXSLEEP

Table 11. Configurations - ULP bit effect (continued)

Black

Green

Table 12. Configurations - Higher communication speed

Curve in Figure 10

Black

Red

Idle mode between

transmissions

Stop

JTAG interface

ON

Current average

over phases 2, 3 and 4

20.45 µA

19.05 µA

Clock

4 MHz MSI