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 and WLCSP 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 pin 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.

WLCSP ball assignments

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

Figure 2. WLCSP ball assignments, top view
WLCSP ball assignments

Table 2. WLCSP ball assignments
Pin Name Function Description Recommended usage
A1 XC1 Analog input Connection for 32 MHz crystal  
A2 XC2 Analog input Connection for 32 MHz crystal  
A3 P1.11 Digital I/O General purpose I/O Standard drive, low frequency I/O only
A4 P1.13 Digital I/O General purpose I/O Standard drive, low frequency I/O only
A5

P0.03

AIN1

Digital I/O

Analog input

General purpose I/O

Analog input

Standard drive, low frequency I/O only
A6

P0.28

AIN4

Digital I/O

Analog input

General purpose I/O

Analog input

Standard drive, low frequency I/O only
A7

P0.30

AIN6

Digital I/O

Analog input

General purpose I/O

Analog input

Standard drive, low frequency I/O only
A8 DEC4 Power

1.3 V regulator supply decoupling

Has to be connected to DEC6 (pin C2)

 
A9 DCC Power DC/DC converter output  
A10 DEC1 Power 1.1 V regulator supply decoupling  
B3 VDD Power Power supply  
B4 P1.10 Digital I/O General purpose I/O Standard drive, low frequency I/O only
B5 P1.14 Digital I/O General purpose I/O Standard drive, low frequency I/O only
B6

P0.02

AIN0

Digital I/O

Analog input

General purpose I/O

Analog input

Standard drive, low frequency I/O only
B7 VSS Power Ground  
B8 VDD Power Power supply  
B9

P0.00

XL1

Digital I/O

Analog input

General purpose I/O

Connection for 32.768 kHz crystal

 
B10

P0.01

XL2

Digital I/O

Analog input

General purpose I/O

Connection for 32.768 kHz crystal

 
C1 VSS_PA Power Ground (radio supply)  
C2 DEC6 Power

1.3 V regulator supply decoupling

Has to be connected to DEC4 (pin A8)

 
C4 VSS Power Ground  
C5 P1.12 Digital I/O General purpose I/O Standard drive, low frequency I/O only
C6 P1.15 Digital I/O General purpose I/O Standard drive, low frequency I/O only
C7

P0.29

AIN5

Digital I/O

Analog input

General purpose I/O

Analog input

Standard drive, low frequency I/O only
C8

P0.31

AIN7

Digital I/O

Analog input

General purpose I/O

Analog input

Standard drive, low frequency I/O only
C9 P0.26 Digital I/O General purpose I/O  
C10

P0.04

AIN2

Digital I/O

Analog input

General purpose I/O

Analog input

 
D3 VSS Power Ground  
D4 VSS Power Ground  
D5 VSS Power Ground  
D6 VSS Power Ground  
D7 VSS Power Ground  
D8 VSS Power Ground  
D9 P0.27 Digital I/O General purpose I/O  
D10

P0.05

AIN3

Digital I/O

Analog input

General purpose I/O

Analog input

 
E1 ANT RF Single-ended radio antenna connection See Reference circuitry for guidelines on how to ensure good RF performance
E2

P0.10

NFC2

Digital I/O

NFC input

General purpose I/O

NFC antenna connection

Standard drive, low frequency I/O only
E3 P1.06 Digital I/O General purpose I/O Standard drive, low frequency I/O only
E4 VSS Power Ground  
E5 VSS Power Ground  
E6 VSS Power Ground  
E7 VSS Power Ground  
E8 VSS Power Ground  
E9 P0.06 Digital I/O General purpose I/O  
E10 P0.08 Digital I/O General purpose I/O  
F1

P0.09

NFC1

Digital I/O

NFC input

General purpose I/O

NFC antenna connection

Standard drive, low frequency I/O only
F2 DEC5 Power 1.3 V regulator supply decoupling  
F3 P1.03 Digital I/O General purpose I/O Standard drive, low frequency I/O only
F4 VSS Power Ground  
F5 VSS Power Ground  
F6 VSS Power Ground  
F7 VSS Power Ground  
F8 VSS Power Ground  
F9

P0.07

TRACECLK

Digital I/O

Trace clock

General purpose I/O

Trace buffer clock

 
F10

P1.09

TRACEDATA3

Digital I/O

Trace data

General purpose I/O

Trace buffer TRACEDATA[3]

 
G1 P1.07 Digital I/O General purpose I/O Standard drive, low frequency I/O only
G2 P1.05 Digital I/O General purpose I/O Standard drive, low frequency I/O only
G3 P1.02 Digital I/O General purpose I/O Standard drive, low frequency I/O only
G4 VSS Power Ground  
G5 VSS Power Ground  
G6 VSS Power Ground  
G7 VSS Power Ground  
G8 VSS Power Ground  
G9 P1.08 Digital I/O General purpose I/O  
G10

P0.12

TRACEDATA1

Digital I/O

Trace data

General purpose I/O

Trace buffer TRACEDATA[1]

 
H1 P1.04 Digital I/O General purpose I/O Standard drive, low frequency I/O only
H2 SWDCLK Digital input Serial wire debug clock input for debug and programming  
H4 P0.24 Digital I/O General purpose I/O  
H5 P0.23 Digital I/O General purpose I/O QSPI
H6 P0.16 Digital I/O General purpose I/O  
H7 P0.13 Digital I/O General purpose I/O  
H8

P0.11

TRACEDATA2

Digital I/O

Trace data

General purpose I/O

Trace buffer TRACEDATA[2]

 
H9 DCCH Power DC/DC converter output  
H10 VDD Power Power supply  
J1 P1.01 Digital I/O General purpose I/O Standard drive, low frequency I/O only
J2 SWDIO Digital I/O Serial wire debug I/O for debug and programming  
J3

P1.00

TRACEDATA0

Digital I/O

Trace data

General purpose I/O

Trace buffer TRACEDATA[0]

Serial wire output (SWO)

QSPI
J4 P0.21 Digital I/O General purpose I/O QSPI
J5 P0.20 Digital I/O General purpose I/O  
J6 P0.17 Digital I/O General purpose I/O  
J7 P0.14 Digital I/O General purpose I/O  
J8 D- Digital I/O USB D- USB
J9 VBUS Power 5 V input for USB 3.3 V regulator  
J10 VDDH Power High voltage power supply  
K1 VDD Power Power supply  
K2 P0.25 Digital I/O General purpose I/O  
K3 P0.22 Digital I/O General purpose I/O QSPI
K4 P0.19 Digital I/O General purpose I/O QSPI/SCK
K5 VDD Power Power supply  
K6

P0.18

nRESET

Digital I/O

General purpose I/O

Configurable as pin reset

 
K7 P0.15 Digital I/O General purpose I/O  
K8 D+ Digital I/O USB D+ USB
K9 DECUSB Power USB 3.3 V regulator supply decoupling  
K10 VSS Power Ground  
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.