Si4020
 
 
5
 
PACKAGE PIN DEFINITIONS, EEPROM MODE
Pin type key: D=digital, A=analog, S=supply, I=input, O=output, IO=input/output
 
EEPROM Mode Pin Assignment
 
 
Pin
Name
Type
Function
1
SDI
DI
Data input of serial control interface
2
SCK
DO     Clock output of serial control interface
3
nSEL
DO     Chip select output 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
SDO
DO     Data output of serial control interface
9
XTL
AIO     Crystal connection (other terminal of crystal to VSS)
10
VSS
S
Ground reference
11     MOD
DI
Connect to logic low (EEPROM mode)
12
RFN
AO
Power amplifier output (open collector)
13
RFP
AO
Power amplifier output (open collector)
14     nLBD
DO     Low battery voltage detector output (active low)
15
VDD
S
Positive supply voltage
16
FSK
DI
Not used, connect to VDD or VSS
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