Datasheet

DocID029968 Rev 3 123/210
STM32L452xx Electrical characteristics
186
t
WUSTOP2
Wake up time from Stop 2
mode to Run mode in
Flash
Range 1
Wakeup clock MSI = 48 MHz 7.93 9.1
µs
Wakeup clock HSI16 = 16 MHz 7.32 8.5
Range 2
Wakeup clock MSI = 24 MHz 8.25 9.4
Wakeup clock HSI16 = 16 MHz 7.32 8.4
Wakeup clock MSI = 4 MHz 11.43 13.3
Wake up time from Stop 2
mode to Run mode in
SRAM1
Range 1
Wakeup clock MSI = 48 MHz 5.23 6
Wakeup clock HSI16 = 16 MHz 6.33 7.1
Range 2
Wakeup clock MSI = 24 MHz 5.78 6.5
Wakeup clock HSI16 = 16 MHz 6.33 7.1
Wakeup clock MSI = 4 MHz 11.37 12.9
t
WUSTBY
Wakeup time from Standby
mode to Run mode
Range 1
Wakeup clock MSI = 8 MHz 16.13 18.2
µs
Wakeup clock MSI = 4 MHz 24.06 26.6
t
WUSTBY
SRAM2
Wakeup time from Standby
with SRAM2 to Run mode
Range 1
Wakeup clock MSI = 8 MHz 16.09 18.2
µs
Wakeup clock MSI = 4 MHz 24 26.6
t
WUSHDN
Wakeup time from
Shutdown mode to Run
mode
Range 1 Wakeup clock MSI = 4 MHz 255.38 316.41 µs
1. Guaranteed by characterization results.
Table 52. Low-power mode wakeup timings
(1)
(continued)
Symbol Parameter Conditions Typ Max Unit
Table 53. 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 54. 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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