STM32L072KB datasheet(17/160 Pages) STMICROELECTRONICS

17 / 160 page

DS10689 Rev 5

17/160

STM32L072xx

Functional overview

Table 3. Functionalities depending on the operating power supply range

Operating power supply

range(1)

1. GPIO speed depends on VDD voltage range. Refer to Table 62: I/O AC characteristics for more information

about I/O speed.

Functionalities depending on the operating power supply

range

DAC and ADC

operation

Dynamic voltage

scaling range

USB

VDD = 1.65 to 1.71 V

ADC only, conversion

time up to 570 ksps

Range 2 or

range 3

Not functional

VDD = 1.71 to 1.8 V(2)

2. CPU frequency changes from initial to final must respect "fcpu initial <4*fcpu final". 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.

ADC only, conversion

time up to 1.14 Msps

Range 1, range 2 or

range 3

Functional(3)

VDD = 1.8 to 2.0 V(2)

Conversion time up to

1.14 Msps

Range1, range 2 or

range 3

Functional(3)

VDD = 2.0 to 2.4 V

Conversion time up to

1.14 Msps

Range 1, range 2 or

range 3

Functional(3)

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

VDD = 2.4 to 3.6 V

Conversion time up to

1.14 Msps

Range 1, range 2 or

range 3

Functional(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

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