AN3422 datasheet(35/52 Pages) STMICROELECTRONICS

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AN3422

Peripheral migration

Doc ID 018976 Rev 2

35/52

4.11

PWR

In STM32L1 series the PWR controller presents some differences vs. F1 series, these

differences are summarized in the table below. However, the programming interface is

unchanged.

Table 14.

PWR differences between STM32F1 series and STM32L1 series

PWR

STM32F1 series

STM32L1 series

Power supplies

1. VDD = 2.0 to 3.6 V: external power

supply for I/Os and the internal

regulator. Provided externally through

VDD pins.

2. VSSA, VDDA = 2.0 to 3.6 V: external

analog power supplies for ADC, DAC,

Reset blocks, RCs and PLL (minimum

voltage to be applied to VDDA is 2.4 V

when the ADC or DAC is used). VDDA

and VSSA must be connected to VDD

and VSS, respectively.

3. 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.

1. VDD = 1.8 V (at power on) or 1.65 V (at power down)

to 3.6 V when the BOR is available. VDD = 1.65 V to

3.6 V, when BOR is not available.

VDD is the external power supply for I/Os and internal

regulator. It is provided externally through VDD pins.

2. VCORE = 1.2 to 1.8 V

VCORE is the power supply for digital peripherals, SRAM

and Flash memory. It is generated by a internal voltage

regulator. Three VCORE ranges can be selected by

software depending on VDD.

3. VSSA, VDDA = 1.8 V (at power on) or 1.65 V (at power

down) to 3.6 V, when BOR is available and VSSA, VDDA =

1.65 to 3.6 V, when BOR is not available.

VDDA is the external analog power supply for ADC, DAC,

reset blocks, RC oscillators and PLL. The minimum

voltage to be applied to VDDA is 1.8 V when the ADC is

used.

4. VLCD = 2.5 to 3.6 V

The LCD controller can be powered either externally

through the VLCD pin, or internally from an internal

voltage generated by the embedded step-up converter.

Battery backup

domain

– Backup registers

–RTC

–LSE

– PC13 to PC15 I/Os

Note: in F1 series the Backup registers

are integrated in the BKP peripheral.

RTC domain

– RTC w/ backup registers

–LSE

– PC13 to PC15 I/Os

Note: in L1 series the backup registers are integrated in

the RTC peripheral

Power supply

supervisor

Integrated POR / PDR circuitry

Programmable Voltage Detector (PVD)

Integrated POR / PDR circuitry

Programmable voltage detector (PVD)

Brownout reset (BOR)

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