BLUENRG-332VC datasheet(10/67 Pages) STMICROELECTRONICS

10 / 67 page

2.6

Power supply management

2.6.1

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.

Figure 4. Power supply configuration

2.6.2

Power supply schemes

The BlueNRG-LPS 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)

BlueNRG-LPS

Power supply management

DS13819 - Rev 4

page 10/67

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