SI4455 Datasheet, PDF (32/40 Pages) Silicon Laboratories – 20-Pin 3x3 mm QFN package

Si4455
7. Pin Descriptions
GND 1 20 19 18 17 16 nSEL
SDN 2
15 SDI
RXp 3
RXn 4
Si4455
14 SDO
13 SCLK
TX 5
12 nIRQ
GND 6 7 8 9 10 11 GPIO1
Pin Pin Name
1
GND
2
SDN
3
RXp
4
RXn
5
TX
6
GND
7
V_DD
8
V_DD
9
GND
10
GPIO0
11
GPIO1
12
nIRQ
13
SCLK
14
SDO
15
SDI
16
nSEL
17
XOUT
18
XIN
19
GPIO2
20
GPIO3
I/O
GND
I
I
I
O
GND
V_DD
V_DD
GND
I/O
I/O
O
I
O
I
I
O
I
I/O
I/O
Description
Ground
Shutdown (0 – V_DD V) – SDN=1, part will be in shutdown mode and contents of all
registers are lost. SDN=0, all other modes
Differential RF receiver input pin
Differential RF receiver input pin
Transmit RF output pin
Ground
Supply voltage
Supply voltage
Ground
General Purpose Digital I/O
General Purpose Digital I/O
Interrupt Status Output – nIRQ = 0, interrupt event has occurred. Read interrupt
status for event details
Serial Clock Input (0 – V_DD V): Provides serial data clock for 4-line serial data bus
Serial Data Output (0 – V_DD V): Provides serial data readback function of internal
control registers
Serial Data Input (0 – V_DD V): Serial data stream input for 4-line serial data bus
Serial Interface Select Input (0 – V_DD V): Provides select/enable function for 4-line
serial data bus
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
32
Rev 1.1