SI4464 Datasheet, PDF (47/56 Pages) Silicon Laboratories – HIGH-PERFORMANCE

Si4464/63/61/60
Pin Pin Name
I/0
Description
12
SCLK
Serial Clock Input.
I
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.
13
SDO
O
0–VDD V Digital Output.
Provides a serial readback function of the internal control registers.
14
SDI
Serial Data Input.
I _{0–VDD V digital input. This pin provides the serial data stream for the 4-line}
serial data bus.
15
nSEL
Serial Interface Select Input.
I _{0–VDD V digital input. This pin provides the Select/Enable function for the}
4-line serial data bus.
16
XOUT
Crystal Oscillator Output.
O _{Connect to an external 25 to 32 MHz crystal, or leave floating when driving}
with an external source on XIN.
17
XIN
I
Crystal Oscillator Input.
Connect to an external 25 to 32 MHz crystal, or connect to an external source.
18
GND
GND ^{Connect to PCB ground.}
19
GPIO2
20
GPIO3
PKG PADDLE_GND
I/O
I/O
GND
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.
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.
Rev 1.2
47