Si4020
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
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
SDI
SCK
nSEL
PB1
PB2
PB3
PB4
CLK
XTL
VSS
MOD
RFN
RFP
nIRQ
VDD
FSK
Type
DI
DI
DI
DI
DI
DI
DI
DO
AIO
S
DI
AO
AO
DO
S
DI
Function
Data input of serial control interface
Clock input of serial control interface
Chip select input of serial control interface (active low)
Push-button input #1 (active low with internal pull-up resistor)
Push-button input #2 (active low with internal pull-up resistor)
Push-button input #3 (active low with internal pull-up resistor)
Push-button input #4 (active low with internal pull-up resistor)
Microcontroller clock (1 MHz-10 MHz)
Crystal connection (other terminal of crystal to VSS)
Ground reference
Connect to logic high (microcontroller mode)
Power amplifier output (open collector)
Power amplifier output (open collector)
Interrupt request output for microcontroller (active low) and status read output
Positive supply voltage
Serial data input for FSK modulation
3
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