Functional overview
STM32L151xC/C-A STM32L152xC/C-A
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DocID026119 Rev 5
V
DD
=V
DDA
= 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
=V
DDA
= 2.4 to 3.6 V
Conversion time up
to 1 Msps
Functional
Range 1, Range 2
or Range 3
Full speed operation
1. 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 3. Functionalities depending on the operating power supply range (continued)
Functionalities depending on the operating power supply range
Operating power supply
range
DAC and ADC
operation
USB
Dynamic voltage
scaling range
I/O operation
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
2.1MHz to 4.2 MHz (1ws)
32 kHz to 2.1 MHz (0ws)
Range 3
