S2-LP datasheet(12/90 Pages) STMICROELECTRONICS

12 / 90 page

Typical application diagram and pin description

S2-LP

12/90

DocID029944 Rev 1

Figure 3: Suggested application diagram (embedded SMPS not used)

Table 2: Description of the external components of the typical application diagrams

Components

SMPS ON

SMPS OFF

Description

Decoupling capacitor for on-chip voltage regulator

to digital part

SMPS LC filter capacitors

C2, C3

Crystal loading capacitors

Decoupling capacitor for on-chip voltage regulator

to synthesizer (LF part)

Decoupling capacitor for band-gap voltage

reference of VCO regulator

Decoupling capacitor for on-chip voltage regulator

to LNA-MIXER

C29, C30, C31,

C32

TX LC filter/matching capacitors

C11, C13, C16,

C21

DC blocking capacitors

C10, C14, C17

RF balun/matching capacitors

SMPS LC filter inductor

RF choke inductor or resonating inductor (upon

RF network topology)

L8, L9, L10

TX LC filter/matching inductors

S2-LPQTR

VDD SMPS

SMPS1

SMPS2

XOUT

XIN

SDN

VSMPS2

VBATT

SHUTDOWN

DIGITAL INTERFACE

XTAL

C10

C16

C30

C31

C32

C21

C17

L10

C11

C13

C14

C28

C29

SCLK

SDI

SDO

VDD DIG/RX

RX-

RX+

EXT 1.4-1.8 V ≡ VSMPS2

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