Datasheet

DocID028800 Rev 1 107/200
STM32L431xx Electrical characteristics
168
t
WUSTOP2
Wake up time from Stop 2
mode to Run mode in
Flash
Range 1
Wakeup clock MSI = 48 MHz 8.02 9.24
µs
Wakeup clock HSI16 = 16 MHz 7.66 8.95
Range 2
Wakeup clock MSI = 24 MHz 8.5 9.54
Wakeup clock HSI16 = 16 MHz 7.75 8.95
Wakeup clock MSI = 4 MHz 12.06 13.16
Wake up time from Stop 2
mode to Run mode in
SRAM1
Range 1
Wakeup clock MSI = 48 MHz 5.45 6.79
Wakeup clock HSI16 = 16 MHz 6.9 7.98
Range 2
Wakeup clock MSI = 24 MHz 6.3 7.36
Wakeup clock HSI16 = 16 MHz 6.9 7.9
Wakeup clock MSI = 4 MHz 13.1 13.31
t
WUSTBY
Wakeup time from Standby
mode to Run mode
Range 1
Wakeup clock MSI = 8 MHz 12.2 18.35
µs
Wakeup clock MSI = 4 MHz 19.14 25.8
t
WUSTBY
SRAM2
Wakeup time from Standby
with SRAM2 to Run mode
Range 1
Wakeup clock MSI = 8 MHz 12.1 18.3
µs
Wakeup clock MSI = 4 MHz 19.2 25.87
t
WUSHDN
Wakeup time from
Shutdown mode to Run
mode
Range 1 Wakeup clock MSI = 4 MHz 261.5 315.7 µs
1. Guaranteed by characterization results.
Table 40. Low-power mode wakeup timings
(1)
(continued)
Symbol Parameter Conditions Typ Max Unit
Table 41. Regulator modes transition times
(1)
Symbol Parameter Conditions Typ Max Unit
t
WULPRUN
Wakeup time from Low-power run mode to
Run mode
(2)
Code run with MSI 2 MHz 5 7
µs
t
VOST
Regulator transition time from Range 2 to
Range 1 or Range 1 to Range 2
(3)
Code run with MSI 24 MHz 20 40
1. Guaranteed by characterization results.
2. Time until REGLPF flag is cleared in PWR_SR2.
3. Time until VOSF flag is cleared in PWR_SR2.
Table 42. Wakeup time using USART/LPUART
(1)
Symbol Parameter Conditions Typ Max Unit
t
WUUSART
t
WULPUART
Wakeup time needed to calculate the
maximum USART/LPUART baudrate
allowing to wakeup up from stop mode
when USART/LPUART clock source is
HSI
Stop mode 0 - 1.7
µs
Stop mode 1/2 - 8.5
1. Guaranteed by design.
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