American Audio B20 User Manual download pdf (Page 17)

Si473x-B20

Rev. 0.5 17

5. Pin Descriptions: Si473x-GM

GND

PAD

17181920

7 8 9

GPO2/INT

VIO

DOUT

LOUT

ROUT

GNDRST

AMI

RCLK

SDIO

VDD

FMI

RFGND

GPO3/DCLK

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

I/O supply voltage.

11 V

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.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 23 24

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American Audio B20 User Manual Page 17

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