STM32L053 datasheet(16/132 Pages) STMICROELECTRONICS

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Functional overview

STM32L053x6 STM32L053x8

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DocID025844 Rev 7

Table 2. Functionalities depending on the operating power supply range

Operating power

supply range

Functionalities depending on the operating power supply range

DAC and ADC

operation

Dynamic

voltage scaling

range

I/O operation

USB

VDD = 1.65 to 1.71 V

ADC only,

conversion time

up to 570 ksps

Range 2 or

range 3

Degraded speed

performance

Not functional

VDD = 1.71 to 1.8 V(1)

1. 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

Degraded speed

performance

Functional(2)

VDD = 1.8 to 2.0 V(1)

Conversion time

up to 1.14 Msps

Range1, range 2

or range 3

Degraded speed

performance

Functional(2)

VDD = 2.0 to 2.4 V

Conversion time

up to

1.14 Msps

Range 1, range 2

or range 3

Full speed operation

Functional(2)

2. 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

Full speed operation

Functional(2)

Table 3. 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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