RM0312 datasheet(56/275 Pages) STMICROELECTRONICS

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Power supply

RM0312

56/275

DocID022352 Rev 3

Power supply

The MCU has one power supply, VDD/VSS (1.65 to 3.6 V), to supply both the I/Os and the

internal voltage regulator. The voltage regulator has 2 modes: Main Voltage Regulator mode

(MVR) and Low Power Voltage Regulator mode (LPVR).

When entering Halt or Active-halt modes (described in Section 9.4.2: Halt mode and

Section 9.4.3: Active-halt mode), the system automatically switches from the MVR to the

LPVR in order to reduce current consumption.

The power-on reset (POR) guarantees a safe reset when the MCU is powered on.

Refer to the electrical characteristics section in the datasheet for details on the operating

range.

Figure 10. Power supply overview

1. Each power supply pair must be decoupled with filtering ceramic capacitors as shown above. These

capacitors must be placed as close as possible to, or below, the appropriate pins to ensure the correct

functionality of the device.

2. This 1 µF capacitor must be connected to the VDD pin.

This 1 µF ceramic capacitor connected to PXS_VREG must be low ESR (ESR

≤ 1Ω).

Note:

The different power modes are described in Section 9: Power management on page 67.

( 1.55 V domain)

PX S_VREG

VDD IO

VDD

VSS IO

VSS

100 nF

(1)

VDD

(3)

1 μF

VDD

(2)

+1 μF

100 nF

(1)

ai18785

Analog blocks

Voltage regulator

- main voltage regulator (MVR)

- low power voltage regulator (LPVR)

16 MHz RC oscillator (HSI)

38 kHz RC oscillator (LSI)

Linear voltage regulator

Digital blocks

I/Os

STM8 MCU care

CPU

RAM

Flash program memory

Data EEPROM

Timers

Communication

peripherals

ProxSense interface

Transmit I/Os

Receive I/Os

Analog ProxSense system

VCORE

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