STS1TX datasheet(11/70 Pages) STMICROELECTRONICS

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STS1TX

Pinout

Table 4. Pinout description

Name

I/O

Description

GPIO_0

I/O

See description of GPIOs below

MISO

SPI data output pin

MOSI

SPI data input pin

SCLK

SPI clock input pin

CSn

SPI chip select

6XOUT

Crystal oscillator output. Connect to an external 26 MHz crystal or

leave floating if driving the XIN pin with an external signal source

7XIN

Crystal oscillator input. Connect to an external 26 MHz crystal or to

an external source. If using an external clock source with no crystal,

DC coupling with a nominal 0.2 VDC level is recommended with

minimum AC amplitude of 400 mVpp.

The instantaneous level at input cannot exceed the 0 - 1.4 V range.

VBAT

VDD

+1.8 V to +3.6 V input supply voltage

9NC

GND_PA

GND

Ground for PA.

To be carefully decoupled from other grounds.

RF output signal

SMPS Ext2

Regulated DC-DC voltage input

SMPS Ext1

DC-DC output pin

SDN

Shutdown input pin. 0-VDD V digital input. SDN should be = ‘0’ in all

modes except shutdown mode. When SDN =’1’ the STS1TX is

completely shut down and the contents of the registers are lost.

VBAT

VDD

+1.8 V to +3.6 V input supply voltage

VREG(1)

VDD

Regulated output voltage. A 100 nF decoupling capacitor is required

GPIO3

I/O

General purpose I/O that may be configured through the SPI

registers to perform various functions, including:

– MCU clock output

– FIFO status flags

– Wakeup input

– Battery level detector

– Temperature sensor output

GPIO2

I/O

GPIO1

I/O

GND

Exposed pad ground pin

1. This pin is intended for use with the STS1TX only. It cannot be used to provide supply voltage to other

devices.

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