Si473x-B20
Rev. 0.5 17
5. Pin Descriptions: Si473x-GM
GND
PAD
1
2
3
17181920
11
12
13
14
6
7 8 9
4
5
16
10
15
GPO2/INT
VIO
DOUT
LOUT
ROUT
GNDRST
NC
AMI
RCLK
SDIO
VDD
FMI
RFGND
GPO3/DCLK
NC
GPO1
DFS
SCLK
SEN
Pin Number(s) Name Description
1, 20 NC No connect. Leave floating.
2 FMI FM/WB/SW RF inputs. FMI should be connected to the antenna trace.
3 RFGND RF ground. Connect to ground plane on PCB.
4 AMI AM/SW/LW RF input. AMI should be connected to the AM antenna.
5RST
Device reset (active low) input.
6 SEN
Serial enable input (active low).
7 SCLK Serial clock input.
8 SDIO Serial data input/output.
9 RCLK External reference oscillator input.
10 V
IO
I/O supply voltage.
11 V
DD
Supply voltage. May be connected directly to battery.
12, GND PAD GND Ground. Connect to ground plane on PCB.
13 ROUT Right audio line output in analog output mode.
14 LOUT Left audio line output in analog output mode.
15 DOUT Digital output data in digital output mode.
16 DFS Digital frame synchronization input in digital output mode.
17 GPO3/DCLK General purpose output, crystal oscillator, or digital bit synchronous clock input
in digital output mode.
18 GPO2/INT
General purpose output or interrupt pin.
19 GPO1 General purpose output.
