SI4X55-C Datasheet, PDF (33/39 Pages) Silicon Laboratories – Preamble sense mode

Si4x55-C
Pin Pin Name
17
XOUT
18
XIN
19
GPIO2
20
GPIO3
PKG PADDLE_GND
I/O
O
I
I/O
I/O
GND
Description
Crystal Oscillator Output
Crystal Oscillator Input: No dc bias required, but if used, should be set to 0.7 V.
Also used for external TCXO input.
General Purpose Digital I/O
General Purpose Digital I/O
The exposed metal paddle on the bottom of the package supplies the RF and cir-
cuit ground(s) for the entire chip. It is very important that a good solder connection
is made between this exposed metal paddle and the ground plane of the underly-
ing PCB.
Rev 1.0
33