Pin assignments

This section describes the pin assignment and the pin functions.

This device provides flexibility when it comes to routing and configuration of the GPIO pins. However, some pins have recommendations for how the pin should be configured or what it should be used for. See aQFN73 ball assignments for more information about this.

aQFN™73 ball assignments

The ball assignment table and figure describe the assignments for this variant of the chip.

Figure 1. aQFN™73 ball assignments, top view
aQFN73 ball assignments

Table 1. aQFN™73 ball assignments
Pin Name Function Description Recommended usage
A8

P0.31

AIN7

Digital I/O

Analog input

General purpose I/O.

Analog input.

Standard drive, low frequency I/O only
A10

P0.29

AIN5

Digital I/O

Analog input

General purpose I/O.

Analog input.

Standard drive, low frequency I/O only
A12

P0.02

AIN0

Digital I/O

Analog input

General purpose I/O.

Analog input.

Standard drive, low frequency I/O only
A14 P1.15 Digital I/O General purpose I/O Standard drive, low frequency I/O only
A16 P1.13 Digital I/O General purpose I/O Standard drive, low frequency I/O only
A18 DEC2 Power 1.3 V regulator supply decoupling  
A20 P1.10 Digital I/O General purpose I/O Standard drive, low frequency I/O only
A22 VDD Power Power supply  
A23 XC2 Analog input Connection for 32 MHz crystal  
B1 VDD Power Power supply  
B3 DCC Power DC/DC converter output  
B5 DEC4 Power

1.3 V regulator supply decoupling.

Has to be connected to DEC6 (pin E24).

 
B7 VSS Power Ground  
B9

P0.30

AIN6

Digital I/O

Analog input

General purpose I/O.

Analog input.

Standard drive, low frequency I/O only
B11

P0.28

AIN4

Digital I/O

Analog input

General purpose I/O.

Analog input.

Standard drive, low frequency I/O only
B13

P0.03

AIN1

Digital I/O

Analog input

General purpose I/O.

Analog input.

Standard drive, low frequency I/O only
B15 P1.14 Digital I/O General purpose I/O Standard drive, low frequency I/O only
B17 P1.12 Digital I/O General purpose I/O Standard drive, low frequency I/O only
B19 P1.11 Digital I/O General purpose I/O Standard drive, low frequency I/O only
B24 XC1 Analog input Connection for 32 MHz crystal  
C1 DEC1 Power 1.1 V regulator supply decoupling  
D2

P0.00

XL1

Digital I/O

Analog input

General purpose I/O.

Connection for 32.768 kHz crystal.

 
D23 DEC3 Power Power supply, decoupling  
E24 DEC6 Power

1.3 V regulator supply decoupling.

Has to be connected to DEC4 (pin B5).

 
F2

P0.01

XL2

Digital I/O

Analog input

General purpose I/O.

Connection for 32.768 kHz crystal.

 
F23 VSS_PA Power Ground (radio supply)  
G1 P0.26 Digital I/O General purpose I/O  
H2 P0.27 Digital I/O General purpose I/O  
H23 ANT RF Single-ended radio antenna connection See Reference circuitry for guidelines on how to ensure good RF performance
J1

P0.04

AIN2

Digital I/O

Analog input

General purpose I/O.

Analog input.

 
J24

P0.10

NFC2

Digital I/O

NFC input

General purpose I/O.

NFC antenna connection.

Standard drive, low frequency I/O only
K2

P0.05

AIN3

Digital I/O

Analog input

General purpose I/O.

Analog input.

 
L1 P0.06 Digital I/O General purpose I/O  
L24

P0.09

NFC1

Digital I/O

NFC input

General purpose I/O.

NFC antenna connection.

Standard drive, low frequency I/O only
M2

P0.07

TRACECLK

Digital I/O

Trace clock

General purpose I/O.

Trace buffer clock.

 
N1 P0.08 Digital I/O General purpose I/O  
N24 DEC5 Power 1.3 V regulator supply decoupling  
P2 P1.08 Digital I/O General purpose I/O  
P23 P1.07 Digital I/O General purpose I/O Standard drive, low frequency I/O only
R1

P1.09

TRACEDATA3

Digital I/O

Trace data

General purpose I/O.

Trace buffer TRACEDATA[3].

 
R24 P1.06 Digital I/O General purpose I/O Standard drive, low frequency I/O only
T2

P0.11

TRACEDATA2

Digital I/O

Trace data

General purpose I/O.

Trace buffer TRACEDATA[2].

 
T23 P1.05 Digital I/O General purpose I/O Standard drive, low frequency I/O only
U1

P0.12

TRACEDATA1

Digital I/O

Trace data

General purpose I/O.

Trace buffer TRACEDATA[1].

 
U24 P1.04 Digital I/O General purpose I/O Standard drive, low frequency I/O only
V23 P1.03 Digital I/O General purpose I/O Standard drive, low frequency I/O only
W1 VDD Power Power supply  
W24 P1.02 Digital I/O General purpose I/O Standard drive, low frequency I/O only
Y2 VDDH Power High voltage power supply  
Y23 P1.01 Digital I/O General purpose I/O Standard drive, low frequency I/O only
AA24 SWDCLK Debug Serial wire debug clock input for debug and programming  
AB2 DCCH Power DC/DC converter output  
AC5 DECUSB Power USB 3.3 V regulator supply decoupling  
AC9 P0.14 Digital I/O General purpose I/O  
AC11 P0.16 Digital I/O General purpose I/O  
AC13

P0.18

nRESET

Digital I/O

General purpose I/O.

Configurable as system RESET.

QSPI/CSN
AC15 P0.19 Digital I/O General purpose I/O QSPI/SCK
AC17 P0.21 Digital I/O General purpose I/O QSPI
AC19 P0.23 Digital I/O General purpose I/O QSPI
AC21 P0.25 Digital I/O General purpose I/O  
AC24 SWDIO Debug Serial wire debug I/O for debug and programming  
AD2 VBUS Power 5 V input for USB 3.3 V regulator  
AD4 D- Digital I/O USB D- USB
AD6 D+ Digital I/O USB D+ USB
AD8 P0.13 Digital I/O General purpose I/O  
AD10 P0.15 Digital I/O General purpose I/O  
AD12 P0.17 Digital I/O General purpose I/O  
AD14 VDD Power Power supply  
AD16 P0.20 Digital I/O General purpose I/O  
AD18 P0.22 Digital I/O General purpose I/O QSPI
AD20 P0.24 Digital I/O General purpose I/O  
AD22

P1.00

TRACEDATA0

Digital I/O

Trace data

General purpose I/O.

Trace buffer TRACEDATA[0].

Serial wire output (SWO).

QSPI
AD23 VDD Power Power supply  
Bottom of chip  
Die pad VSS Power Ground pad. Exposed die pad must be connected to ground (VSS) for proper device operation.  
Note: For more information on standard drive, see GPIO — General purpose input/output. Low frequency I/O is signals with a frequency up to 10 kHz.

Documentation feedback | Developer Zone | Updated 2018-03-22