Datasheet

DocID025936 Rev 8 17/143
STM32L052x6 STM32L052x8 Functional overview
36
Table 3. Functionalities depending on the operating power supply range
Operating power supply
range
(1)
1. GPIO speed depends on V
DD
voltage range. Refer to Table 61: 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
V
DD
= 1.65 to 1.71 V
ADC only, conversion
time up to 570 ksps
Range 2 or
range 3
Not functional
V
DD
= 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)
V
DD
= 1.8 to 2.0 V
(2)
Conversion time up to
1.14 Msps
Range1, range 2 or
range 3
Functional
(3)
V
DD
= 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 V
DD_USB
is 3.0 V.
V
DD
= 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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