STM32L151VC datasheet(16/136 Pages) STMICROELECTRONICS

16 / 136 page

Functional overview

STM32L151xC STM32L152xC

16/136

DocID022799 Rev 12

VDD=VDDA = 2.0 to 2.4 V

Conversion time up

to 500 Ksps

Functional(2)

Range 1, Range 2

or Range 3

Full speed operation

VDD=VDDA = 2.4 to 3.6 V

Conversion time up

to 1 Msps

Functional(2)

Range 1, Range 2

or Range 3

Full speed operation

1. CPU frequency changes from initial to final must respect “FCPU initial < 4*FCPU final” to limit VCORE drop due to current

consumption peak when frequency increases. It must also respect 5 µs delay between two changes. For example to switch

from 4.2 MHz to 32 MHz, the user can switch from 4.2 MHz to 16 MHz, wait 5 µs, then switch from 16 MHz to 32 MHz.

2. Should be USB compliant from I/O voltage standpoint, the minimum VDD is 3.0 V.

Table 3. Functionalities depending on the operating power supply range (continued)

Functionalities depending on the operating power supply range

Operating power supply

range

DAC and ADC

operation

USB

Dynamic voltage

scaling range

I/O 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

2.1MHz to 4.2 MHz (1ws)

32 kHz to 2.1 MHz (0ws)

Range 3

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