Datasheet

Functional overview STM32L073xx
16/137 DocID027096 Rev 2
Table 3. 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
V
DD
= 1.65 to 1.71 V
ADC only,
conversion time
up to 570 ksps
Range 2 or
range 3
Degraded speed
performance
Not functional
V
DD
= 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)
V
DD
= 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)
V
DD
= 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 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
Full speed operation Functional
(2)
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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