A2500R24x – Users Manual
Page 21 of 26
Release Date 01/10/11
5
NC
NC
No Connect, the pin is not connected internally, but is
reserved for future expansion. It is recommended not to
connect this pin to anything.
6
NC
NC
No Connect, the pin is not connected internally, but is
reserved for future expansion. It is recommended not to
connect this pin to anything.
7
Vdcoup1
Analog
Optional decoupling of the modules internal Vdd supply. It
is recommended to not connect anything to this pin. In
particular noisy environment this pin can be used to further
reduce the noise on the modules internal Vdd, please see
section 3.4 for further information.
8
GND
Ground
One of two primary ground pins
9 SCLK Digital
Input
SPI bus clock signal
10 MISO/GDO1
Digital
Output
SPI bus data out from radio when CSN is low, and general
purpose I/O pin when CSN is high
11 MOSI
Digital
Input
SPI bus data into radio
12 _CSN
Digital
Input
SPI bus select (active low)
13 GDO0
Digital
I/O
(Analog
output)
General purpose port
14
GDO2
Digital I/O
General purpose port
15
Vdcoup2
Analog
Optional decoupling of the modules internal Vdd supply. It
is recommended to not connect anything to this pin. In
particular noisy environment this pin can be used to further
reduce the noise on the modules internal Vdd, please see
section 3.4 for further information.
16
NC
NC
No Connect, the pin is not connected internally, but is
reserved for future expansion. It is recommended not to
connect this pin to anything.
17
GND
Ground
One of two primary ground pins
18 Vdd
Power
Supply
Power supply pin
19
NC
NC
No Connect, the pin is not connected internally, but is
reserved for future expansion. It is recommended not to
connect this pin to anything.
20
NC
NC
No Connect, the pin is not connected internally, but is
reserved for future expansion. It is recommended not to
connect this pin to anything.
21
NC
NC
No Connect, the pin is not connected internally, but is
reserved for future expansion. It is recommended not to
connect this pin to anything.
22 DNC
NC
Do Not
Connect. Internal GND connection used during
testing, not recommended to connect to main GND.
23
DNC
NC
No Connect, the pin is not connected internally, but is
reserved for future expansion. It is recommended not to
