SI4463 datasheet(45/53 Pages) SILABS

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Si4463/61/60-C

Rev 1.0

SCLK

Serial Clock Input.

0–VDD V digital input. This pin provides the serial data clock function for the

4-line serial data bus. Data is clocked into the Si4463/61 on positive edge tran-

sitions.

SDO

0–VDD V Digital Output.

Provides a serial readback function of the internal control registers.

SDI

Serial Data Input.

0–VDD V digital input. This pin provides the serial data stream for the 4-line

serial data bus.

nSEL

Serial Interface Select Input.

0–VDD V digital input. This pin provides the Select/Enable function for the

4-line serial data bus.

XOUT

Crystal Oscillator Output.

Connect to an external 25 to 32 MHz crystal, or leave floating when driving

with an external source on XIN.

XIN

Crystal Oscillator Input.

Connect to an external 25 to 32 MHz crystal, or connect to an external source.

GND

When using an XTAL, leave floating per the reference design schematic. When

using a TCXO, connect to TCXO GND, which should be separate from the

board’s reference ground plane.

GPIO2

I/O

General Purpose Digital I/O.

May be configured through the registers to perform various functions, including

Microcontroller Clock Output, FIFO status, POR, Wake-Up timer, Low Battery

Detect, TRSW, AntDiversity control, etc.

GPIO3

I/O

PKG

PADDLE_GND

GND

The exposed metal paddle on the bottom of the Si446x supplies the RF and cir-

cuit ground(s) for the entire chip. It is very important that a good solder connec-

tion is made between this exposed metal paddle and the ground plane of the

PCB underlying the Si446x.

Pin Name

I/0

Description

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