S2-LPQTR datasheet(13/90 Pages) STMICROELECTRONICS

13 / 90 page

S2-LP

Typical application diagram and pin description

DocID029944 Rev 1

13/90

Components

SMPS ON

SMPS OFF

Description

L3, L5, L6

RX balun/matching inductors

XTAL

Crystal

3.1

Pin diagram

Figure 4: Pin diagram, 4 mm x 4 mm QFN24 package

3.2

Pin description

Table 3: Pinout

Pin name

Pin type

Description

VDD

SMPS

Power

1.8 V to 3.6 V analog power supply for SMPS only.

SMPS1

Analog out

1.1 V to 1.8 V SMPS regulator output to be externally filtered.

SMPS2

Analog in

1.1 V to 1.8 V SMPS voltage input after LC filtering applied to

SMPS1 output.

XOUT

Analog out

Crystal oscillator output. Connect to an external crystal or leave

floating if driving the XIN pin with an external clock source.

XIN

Analog in

Crystal oscillator input. Connect to an external crystal or to an

external clock source. If using an external clock source, DC

coupling with a minimum 0.2 VDC level is recommended and

minimum AC amplitude of 400 mVpp (however, the instantaneous

level at input cannot exceed the 0

– 1.4 V range).

S2-LPQTR 数据表(PDF) 13 Page - STMicroelectronics

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