4
IA4420
PACKAGE PIN DEFINITIONS
Pin type key: D=digital, A=analog, S=supply, I=input, O=output, IO=input/output
Note:
Note:
Note:
Note:
Note: The actual mode of the multipurpose pins (pin 6 and 7) is determined by the TX/RX data I/O settings of the
transceiver.
SDI
SCK
nSEL
SDO
nIRQ
FSK / DATA / nFFS
DCLK / CFIL / FFIT
CLK
nINT / VDI
ARSSI
VDD
VSS
RF1
RF2
nRES
XTL / REF
Pin
Name
Type
Function
1
SDI
DI
Data input of the serial control interface (SPI compatible)
2
SCK
DI
Clock input of the serial control interface
3
nSEL
DI
Chip select input of the serial control interface (active low)
4
SDO
DO
Serial data output with bus hold
5
nIRQ
DO
Interrupt request output (active low)
FSK
DI
Transmit FSK data input
DATA
DO
Received data output (FIFO not used)
nFFS
DI
FIFO select input (active low) In FIFO mode, when bit ef is set in Configuration Setting Command
DLCK
DO
Received data clock output (Digital filter used, FIFO not used)
CFIL
AIO
External data filter capacitor connection (Analog filter used)
FFIT
DO
FIFO interrupt (active high) Number of the bits in the RX FIFO that reach the preprogrammed limit
In FIFO mode, when bit ef is set in Configuration Setting Command
8
CLK
DO
Microcontroller clock output
XTL
AIO
Crystal connection (the other terminal of crystal to VSS) or external reference input
REF
AIO
External reference input. Use 33 pF series coupling capacitor
10
nRES
DIO
Open drain reset output with internal pull-up and input buffer (active low)
11
VSS
S
Ground reference voltage
12
RF2
AIO
RF differential signal input/output
13
RF1
AIO
RF differential signal input/output
14
VDD
S
Positive supply voltage
15
ARSSI
AO
Analog RSSI output
nINT
DI
Interrupt input (active low)
VDI
DO
Valid data indicator output
7
16
6
9
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