BLUENRG-LP datasheet(11/72 Pages) STMICROELECTRONICS

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1.6.2

Power supply schemes

The BlueNRG-LP embeds three power domains:

•

VDD33 (VDDIO or VDD):

–

the voltage range is between 1.7 V and 3.6 V

–

it supplies a part of the I/O ring, the embedded regulators and the system analog IPs as power

management block and embedded oscillators

•

VDD12o:

–

always-on digital power domain

–

this domain is generally supplied at 1.2 V during active phase of the device

–

this domain is supplied at 1.0 V during low power mode (DEEPSTOP)

•

VDD12i:

–

interruptible digital power domain

–

this domain is generally supplied at 1.2 V during active phase of the device

–

this domain is shut down during low power mode (DEEPSTOP)

Figure 5. Power supply domain overview

SMPS

MLDO

LP-Reg

CPU

RF_FSM

BLE

Peripherals

RCCi

Interruptible domain

(VDD12I)

HSI

BLE_wakeup,

RTC, WDOG,

PWRCo,

RCCo

AlwaysOn

Domain

(VDD12O)

HSE, LSI, LSE

PDR, POR, PVD

PWRC33,

RCC33

V33 Domain

(VDDIO)

VDDIO

CMDNO

CMDNI

VREG PAD

VFBSD

VGATEN

VGATEP

VDD12O

VDD12I

RFLDOs

Analo

VRF

1.6.3

Linear voltage regulators

The digital power supplies are provided by different regulators:

•

The main LDO (MLDO):

–

it provides 1.2 V from a 1.4-3.3 V input voltage

–

it supplies both VDD12i and VDD12o when the device is active

–

it is disabled during the low power mode (DEEPSTOP)

•

Low power LDO (LPREG):

–

it stays enabled during both active and low power phases

–

it provides 1.0 V voltage

–

it is not connected to the digital domain when the device is active

–

it is connected to the VDD12o domain during low power mode (DEEPSTOP)

•

A dedicated LDO (RFLDO) to provide a 1.2 V to the analog RF block

An embedded SMPS step-down converter is available (inserted between the external power and the LDOs).

BlueNRG-LP

Power supply management

DS13282 - Rev 2

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