STM32L031C6 datasheet(17/118 Pages) STMICROELECTRONICS

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DocID027063 Rev 4

17/118

STM32L031x4/6

Functional overview

Table 3. Functionalities depending on the operating power supply range

Operating power supply

range

Functionalities depending on the operating power supply range

ADC operation

Dynamic voltage

scaling range

I/O operation

VDD = 1.65 to 1.71 V

Conversion time up

to 570 ksps

Range 2 or

range 3

Degraded speed

performance

VDD = 1.71 to 2.0 V(1)

1. CPU frequency changes from initial to final must respect the condition: fCPU initial <4fCPU 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

Degraded speed

performance

VDD = 2.0 to 2.4 V

Conversion time up

to 1.14 Msps

Range 1, range 2 or

range 3

Full speed operation

VDD = 2.4 to 3.6 V

Conversion time up

to 1.14 Msps

Range 1, range 2 or

range 3

Full speed operation

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

Flash memory

RAM

Backup registers

EEPROM

Brown-out reset

(BOR)

DMA

Programmable

Voltage Detector

(PVD)

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