AN4635 datasheet(25/34 Pages) STMICROELECTRONICS

Part #	AN4635

Description	Minimization of power consumption using LPUART in microcontrollers of the STM32L0 series

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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25 / 34 page

DocID027290 Rev 1

25/34

AN4635

Power consumption comparison

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)

Curve in Figure 9

Black

Green

Table 12. Configurations - Higher communication speed

Curve in Figure 10

Black

Red

Idle mode between

transmissions

Stop

JTAG interface

Current average

over phases 2, 3 and 4

20.45 µA

19.05 µA

Clock

4 MHz MSI

AN4635 Datasheet(PDF) 25 Page - STMicroelectronics