Datasheet

DS10668 Rev 6 17/126
STM32L031x4/6 Functional overview
33
Table 3. Functionalities depending on the operating power supply range
Operating power supply range
(1)
1. GPIO speed depends on V
DD
voltage range. Refer to Table 55: I/O AC characteristics for more information
about I/O speed.
Functionalities depending on the operating power
supply range
ADC operation
Dynamic voltage scaling
range
V
DD
= 1.65 to 1.71 V
Conversion time up to
570 ksps
Range 2 or
range 3
V
DD
= 1.71 to 2.0 V
(2)
2. CPU frequency changes from initial to final must respect the condition: f
CPU initial
<4f
CPU initial
. It must also
respect 5 μs delay between two changes. For example to switch from 4.2 MHz to 32 MHz, you can switch
from 4.2 MHz to 16 MHz, wait 5 μs, then switch from 16 MHz to 32 MHz.
Conversion time up to
1.14 Msps
Range 1, range 2 or range 3
V
DD
= 2.0 to 2.4 V
Conversion time up to 1.14
Msps
Range 1, range 2 or range 3
V
DD
= 2.4 to 3.6 V
Conversion time up to 1.14
Msps
Range 1, range 2 or range 3
Table 4. CPU frequency range depending on dynamic voltage scaling
CPU frequency range Dynamic voltage scaling range
16 MHz to 32 MHz (1ws)
32 kHz to 16 MHz (0ws)
Range 1
8 MHz to 16 MHz (1ws)
32 kHz to 8 MHz (0ws)
Range 2
32 kHz to 4.2 MHz (0ws) Range 3
Table 5. Functionalities depending on the working mode
(from Run/active down to standby)
(1)
IPs Run/Active Sleep
Low-
power
run
Low-
power
sleep
Stop Standby
Wakeup
capability
Wakeup
capability
CPU Y -- Y -- -- --
Flash memory O O O O -- --
RAM Y Y Y Y Y --
Backup registers Y Y Y Y Y Y
EEPROM O O O O -- --
Brown-out reset
(BOR)
OOOOOOOO
DMA O O O O -- --
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