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AN4635 Scheda tecnica(PDF) 7 Page - STMicroelectronics

Il numero della parte AN4635
Spiegazioni elettronici  Minimization of power consumption using LPUART in microcontrollers of the STM32L0 series
PDF  34 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4635 Scheda tecnica(HTML) 7 Page - STMicroelectronics

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AN4635
Summary of features
33
2
Summary of features
The LPUART has less features compared to the USART, however it is able to operate using
less power and using the LSE clock more efficiently.
The main features for the two peripherals are summarized in Table 2.
The USART is also able to operate using LSE clock, the communication speed is limited to
4000 baud in case of oversampling by 8, 2000 baud when oversampling is by 16.
When using the LPUART, only the 32.768 kHz LSE clock is required to allow UART
communications up to 9600 baud with minimal energy consumption and very precise speed
setting allowed by the external crystal.
For higher speeds (for example the 57600 baud used for BT LE) the LPUART energy
efficiency advantage drops, but still remains measurable around 5% (see Section 6.9:
Higher communication speed).
This document focuses on communication at 9600 baud, common to many applications: the
efficiency advantage of LPUART is more pronounced when using wakeup from Stop at the
9600 baud speed setting.
Table 2. Comparison of features
Configuration
LPUART
USART
LSE 9600 baud option
+
-
Synchronous mode
-
+
IrDA SIR ENDEC block
-
+
Smartcard mode
-
+
Auto baud rate detection
-
+
Modbus communication
-
+
LIN mode
-
+



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