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STM32L151x6/8/B, STM32L152x6/8/B
Functional overview
46
V
DD
= 2.0 to 2.4 V
Conversion time
up to 500 Ksps
Functional
(2)
Range 1,
Range 2 or
Range 3
Full speed operation
V
DD
= 2.4 to 3.6 V
Conversion time
up to 1 Msps
Functional
Range 1,
Range 2 or
Range 3
Full speed operation
1. The CPU frequency changes from initial to final must respect "F
CPU
initial < 4*F
CPU
final" to limit V
CORE
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, you can switch from 4.2 MHz to 16 MHz,
wait 5 µs, then switch from 16 MHz to 32 MHz.
2. Should be USB compliant from I/O voltage standpoint, the minimum V
DD
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
2.1 MHz 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)
Operating power
supply range
Functionalities depending on the operating power supply range
DAC and ADC
operation
USB
Dynamic voltage
scaling range
I/O operation