STM32F103XC datasheet(13/118 Pages) STMICROELECTRONICS

13 / 118 page

STM32F103xC, STM32F103xD, STM32F103xE

Description

13/118

Power supply schemes

●

VDD = 2.0 to 3.6 V: external power supply for I/Os and the internal regulator.

Provided externally through VDD pins.

●

VSSA, VDDA = 2.0 to 3.6 V: external analog power supplies for ADC, Reset blocks, RCs

and PLL (minimum voltage to be applied to VDDA is 2.4 V when the ADC is used). VDDA

and VSSA must be connected to VDD and VSS, respectively.

●

VBAT = 1.8 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and backup

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

For more details on how to connect power pins, refer to Figure 11: Power supply scheme.

Power supply supervisor

The device has an integrated power-on reset (POR)/power-down reset (PDR) circuitry. It is

always active, and ensures proper operation starting from/down to 2 V. The device remains

in reset mode when VDD is below a specified threshold, VPOR/PDR, without the need for an

external reset circuit.

The device features an embedded programmable voltage detector (PVD) that monitors the

VDD power supply and compares it to the VPVD threshold. An interrupt can be generated

when VDD drops below the VPVD and/or when VDD is higher than the VPVD threshold. The

interrupt service routine can then generate a warning message and/or put the MCU into a

safe state. The PVD is enabled by software. Refer to Table 11: Embedded reset and power

control block characteristics for the values of VPOR/PDR and VPVD.

Voltage regulator

The regulator has three operation modes: main (MR), low power (LPR) and power down.

●

MR is used in the nominal regulation mode (Run)

●

LPR is used in the Stop modes.

●

Power down is used in Standby mode: the regulator output is in high impedance: the

kernel circuitry is powered down, inducing zero consumption (but the contents of the

registers and SRAM are lost)

This regulator is always enabled after reset. It is disabled in Standby mode.

Low-power modes

The STM32F103xC, STM32F103xD and STM32F103xE performance line supports three

low-power modes to achieve the best compromise between low power consumption, short

startup time and available wakeup sources:

●

Sleep mode

In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can

wake up the CPU when an interrupt/event occurs.

●

Stop mode

Stop mode achieves the lowest power consumption while retaining the content of

SRAM and registers. All clocks in the 1.8 V domain are stopped, the PLL, the HSI RC

and the HSE crystal oscillators are disabled. The voltage regulator can also be put

either in normal or in low-power mode.

The device can be woken up from Stop mode by any of the EXTI line. The EXTI line

source can be one of the 16 external lines, the PVD output, the RTC alarm or the USB

wakeup.

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