S2-LPS datasheet(5/73 Pages) STMICROELECTRONICS

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Typical application diagram and pin description

This section describes three different application diagrams for the S2-LPS. Two main configurations are available:

•

HPM (high performance mode) configuration

•

LPM (low power mode) configuration

In the LPM operating mode the LDOs are bypassed and the SMPS provides the regulator voltage at 1.2 V. Note

that in LPM the PA is supplied from SMPS at 1.2 V (instead of 1.5 V as in HPM), so the max. output power

is lower than HPM. The figure below shows the suggested configuration with discrete matching network and

SMPS-ON.

Figure 2. Suggested application diagram (embedded SMPS used)

C29

C21

C14

S2-LP

VDDSMPS

SMPS1

SMPS2

XOUT

XIN

SDN

SCLK

SDI

SDO

VDDRXDIG

RXP

RXN

C13

C32

C30

C10

XTAL

C11

C16

L10

C28

C17

C31

SHUTDOWN

VBATT

VSMPS2

VBATT

Digital interface

Figure 3. Suggested application diagram (embedded SMPS not used) shows the suggested configuration with

discrete matching network and SMPS-OFF mode.

S2-LPS

Typical application diagram and pin description

DS13831 - Rev 1

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