STM32L151XE datasheet(16/136 Pages) STMICROELECTRONICS

16 / 136 page

Functional overview

STM32L151xE STM32L152xE

16/136

DS10002 Rev 10

VDD=VDDA = 2.0 to 2.4 V

Conversion time up

to 500 Ksps

Functional(3)

Range 1, Range 2 or

Range 3

VDD=VDDA = 2.4 to 3.6 V

Conversion time up

to 1 Msps

Functional(3)

Range 1, Range 2 or

Range 3

1. The GPIO speed also depends from VDD voltage and the user has to refer to Table 44: I/O AC

characteristics for more information about I/O speed.

2. 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.

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

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

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

Functionalities depending on the operating power supply

range(1)

Operating power supply

range

DAC and ADC

operation

USB

Dynamic voltage scaling

range

STM32L151XE Datasheet(PDF) 16 Page - STMicroelectronics

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