SI4720-B20 Datasheet, PDF (41/48 Pages) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

7. Pin Descriptions: Si4720/21-GM
Si4720/21-B20
NC 1 ^{20 19 18 17} 16
FMI 2
15 RIN/DOUT
RFGND 3
TXO 4
GND
PAD
14 LOUT/DFS
13 ROUT/DIN
RST 5
12 GND
6 _{7 8 9 10} 11 VDD
Pin Number(s)
1, 20
2
3
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
12, GND PAD
Name
NC
FMI
RFGND
TXO
RST
SEN
SCLK
SDIO
RCLK
VIO
VDD
ROUT/DIN
LOUT/DFS
RIN/DOUT
LIN/DFS
GPO3/DCLK
GPO2/INT
GPO1
GND
Description
No connect. Leave floating.
FM RF input.
RF ground. Connect to ground plane on PCB.
FM transmit output connection to transmit antenna.
Device reset (active low) input.
Serial enable input (active low).
Serial clock input.
Serial data input/output.
External reference oscillator input.
I/O supply voltage.
Supply voltage. May be connected directly to battery.
Right audio line output—digital input data.
Left audio line output—digital frame synchronization.
Right audio line input—digital output data.
Left audio line input—digital frame synchronization.
General purpose output—digital bit synchronous clock.
General purpose output—interrupt request.
General purpose output.
Ground. Connect to ground plane on PCB.
Rev. 1.0
41