BLUENRG-345VT datasheet(9/72 Pages) STMICROELECTRONICS

9 / 72 page

Figure 3. BlueNRG-LP RF block diagram

Timer and Power

control

AGC

control

RF control

BLE

controller

BLE

modulator

BLE

demodulator

ADC

filter

LNA

RF1

PA ramp

generator

PLL

LDO

Max PA

level

Trimmed

bias

SMPS

HSE

Adjust

VLXSD

VFBSD

VDDSD VSSSD

VDDRF

TX_SEQUENCE

Interrupt

Wakeup

AHB

APB

See

notes

Notes: QFN42 and QFN48: VSS through exposed pad,

and VSSRF pins must be connected to ground plane CSP49: VSSRF pins must be connected to ground plane.

RX_SEQUENCE

1.6

Power supply management

1.6.1

SMPS step-down regulator

The device integrates a step-down converter to improve low power performance when the VDD voltage is high

enough. The SMPS output voltage can be programmed from 1.2 V to 1.90 V. It is internally clocked at 4 MHz or 8

MHz.

The device can be operated without the SMPS by just wiring its output to VDD. This is the case for applications

where the voltage is low, or where the power consumption is not critical.

Except for the configuration SMPS OFF, an L/C BOM must be present on the board and connected to the VFBSD

pad.

BlueNRG-LP

Power supply management

DS13282 - Rev 2

page 9/72

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