STM32L4A6RG datasheet(23/282 Pages) STMICROELECTRONICS

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DS11584 Rev 8

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STM32L4A6xG

Functional overview

3.10

Power supply management

3.10.1

Power supply schemes

•

VDD = 1.71 to 3.6 V: external power supply for I/Os (VDDIO1), the internal regulator and

the system analog such as reset, power management and internal clocks. It is provided

externally through VDD pins.

•

VDD12 = 1.05 to 1.32 V: external power supply bypassing internal regulator when

connected to an external SMPS. It is provided externally through VDD12 pins and only

available on packages with the external SMPS supply option. VDD12 does not require

any external decoupling capacitance and cannot support any external load.

•

VDDA = 1.62 V (ADCs/COMPs) / 1.8 (DAC/OPAMPs) to 3.6 V: external analog power

supply for ADCs, DAC, OPAMPs, Comparators and Voltage reference buffer. The VDDA

voltage level is independent from the VDD voltage.

•

VDDUSB = 3.0 to 3.6 V: external independent power supply for USB transceivers. The

VDDUSB voltage level is independent from the VDD voltage.

•

VDDIO2 = 1.08 to 3.6 V: external power supply for 14 I/Os (PG[15:2]). The VDDIO2

voltage level is independent from the VDD voltage.

•

VLCD = 2.5 to 3.6 V: the LCD controller can be powered either externally through VLCD

pin, or internally from an internal voltage generated by the embedded step-up

converter.

•

VBAT = 1.55 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and

backup registers (through power switch) when VDD is not present.

Note:

When the functions supplied by VDDA, VDDUSB or VDDIO2 are not used, these supplies

should preferably be shorted to VDD.

Note:

If these supplies are tied to ground, the I/Os supplied by these power supplies are not 5 V

tolerant (refer to Table 19: Voltage characteristics).

Note:

VDDIOx is the I/Os general purpose digital functions supply. VDDIOx represents VDDIO1 or

VDDIO2, with VDDIO1 = VDD. VDDIO2 supply voltage level is independent from VDDIO1.

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