Table 4. Cpu Frequency Range Depending On Dynamic Voltage Scaling - STMicroelectronics STM32L151CB Manual

STM32L151x6/8/B, STM32L152x6/8/B
Table 3. Functionalities depending on the operating power supply range (continued)
Operating power
supply range
V = 2.0 to 2.4 V
DD
V = 2.4 to 3.6 V
DD
1. The CPU frequency changes from initial to final must respect "F
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

Table 4. CPU frequency range depending on dynamic voltage scaling

Functionalities depending on the operating power supply range
DAC and ADC
operation
Conversion time
up to 500 Ksps
Conversion time
up to 1 Msps
CPU frequency range
16 MHz to 32 MHz (1ws)
32 kHz to 16 MHz (0ws)
8 MHz to 16 MHz (1ws)
32 kHz to 8 MHz (0ws)
2.1 MHz to 4.2 MHz (1ws)
32 kHz to 2.1 MHz (0ws)
DocID17659 Rev 10
Dynamic voltage
USB
scaling range
Range 1,
(2)
Functional Range 2 or
Range 3
Range 1,
(2)
Functional Range 2 or
Range 3
initial < 4*F
CPU
is 3.0 V.
DD
Dynamic voltage scaling range
Functional overview
I/O operation
Full speed operation
Full speed operation
final" to limit V
CPU CORE
Range 1
Range 2
Range 3
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