Data Sheet
Page 12
nRF51822 Product Specification v3.1
2.2.1.1 Pin functions QFN48
Pin Pin name Pin function Description
1
VDD Power Power supply.
2
DCC Power DC/DC output voltage to external LC filter.
3
P0.30 Digital I/O General purpose I/O pin.
4
P0.00
AREF0
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP reference input 0.
5
P0.01
AIN2
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 2.
6
P0.02
AIN3
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 3.
7
P0.03
AIN4
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 4.
8
P0.04
AIN5
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 5.
9
P0.05
AIN6
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 6.
10
P0.06
AIN7
AREF1
Digital I/O
Analog input
Analog input
General purpose I/O pin.
ADC/LPCOMP input 7.
ADC/LPCOMP reference input 1.
11
P0.07 Digital I/O General purpose I/O pin.
12
VDD Power Power supply.
13
VSS Power
Ground (0 V)
1
.
14 to 22
P0.08toP0.16 Digital I/O General purpose I/O pin.
23
SWDIO/nRESET Digital I/O
System reset (active low). Also hardware debug and flash
programming I/O.
24
SWDCLK Digital input Hardware debug and flash programming I/O.
25 to 28
P0.17toP0.20 Digital I/O General purpose I/O pin.
29
DEC2 Power Power supply decoupling.
30
VDD_PA Power output Power supply output (+1.6 V) for on-chip RF power amp.
31
ANT1 RF Differential antenna connection (TX and RX).
32
ANT2 RF Differential antenna connection (TX and RX).
33, 34
VSS Power Ground (0 V).
35, 36
AVDD Power Analog power supply (Radio).
37
XC1 Analog input
Connection for 16/32 MHz crystal or external 16 MHz clock
reference.
38
XC2 Analog output Connection for 16/32 MHz crystal.
39
DEC1 Power Power supply decoupling.