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SI4020

Universal ISM Band FSK Transmitter

Silicon Laboratories 

PACKAGE PIN DEFINITIONS, MICROCONTROLLER MODE

Pin type key: D=digital, A=analog, S=supply, I=input, O=output, IO=input/output

Microcontroller Mode Pin Assignment

Si4020

Pin Name Type Function

1

SDI

DI Data input of serial control interface

2

SCK

DI Clock input of serial control interface

3 nSEL

DI Chip select input of serial control interface (active low)

4

PB1

DI Push-button input #1 (active low with internal pull-up resistor)

5

PB2

DI Push-button input #2 (active low with internal pull-up resistor)

6

PB3

DI Push-button input #3 (active low with internal pull-up resistor)

7

PB4

DI Push-button input #4 (active low with internal pull-up resistor)

8

CLK

DO Microcontroller clock (1 MHz-10 MHz)

9

XTL

AIO Crystal connection (other terminal of crystal to VSS)

10 VSS

S Ground reference

11 MOD

DI Connect to logic high (microcontroller mode)

12 RFN

AO Power amplifier output (open collector)

13 RFP

AO Power amplifier output (open collector)

14 nIRQ DO Interrupt request output for microcontroller (active low) and status read output

15 VDD

S Positive supply voltage

16 FSK

DI Serial data input for FSK modulation

3

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