STM8S datasheet(73/467 Pages) STMICROELECTRONICS

No. de pieza	STM8S

Descripción Electrónicos	STM8S Series and STM8AF Series 8-bit microcontrollers

PDF	467 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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DocID14587 Rev 14

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RM0016

Power supply

104

Power supply

The MCU has four distinct power supplies:

•

VDD/VSS: Main power supply (3 V to 5.5 V)

•

VDDIO/VSSIO: I/O power supply (3 V to 5.5 V)

•

VDDA/VSSA: Power supply for the analog functions

•

VREF+/VREF-: Reference supply for Analog Digital Converter

The VDD/VSS pins are used to supply the internal Main Voltage Regulator (MVR) and the

internal Low Power Voltage Regulator (LPVR). The 2 regulator outputs are connected and

provide the 1.8 V supply (V18) to the MCU core (CPU, Flash and RAM)

In low power modes the system automatically switches from the MVR to the LPVR in order

to reduce current consumption.

To stabilize the MVR, a capacitor must be connected to the VCAP pin (for more details refer

to the datasheet electrical characteristics section).

Depending on the package size, there are one or two pairs of dedicated pins for

VDDIO/VSSIO to supply power to the I/Os.

VDDA/VSSA and VREF+/VREF- are connected to the Analog to Digital Converter (ADC).

Figure 17. Power supply overview

STM8S Datasheet(PDF) 73 Page - STMicroelectronics