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.

In addition to the information in the pinout tables for the respective packages, the following peripherals have dedicated pins that should be used for proper operation:

Table 1. Special GPIO considerations
GPIO pin Description
P0.08 - P0.12 Drive configuration E0E1 is available and must be used for TRACE. For 32 Mbps high-speed SPI using SPIM4, drive configuration H0H1 must be used.
P0.13 - P0.18 The H0H1 drive configuration features the highest speeds of quad SPI using the direct connection of the QSPI peripheral.
P1.02 and P1.03 The E0E1 drive configuration activates a 20 mA open-drain driver specifically designed for high-speed TWI.
Remaining pins The E0E1 drive configuration is not supported. Using the E0E1 drive configuration will cause incorrect operation.
Note: The extra high drive E0E1 drive configuration has limited availability. It is only available for the dedicated TRACE pins on P0.08 through P0.12. For the dedicated, high-speed TWIM pins on P1.02 and P1.03, the E0E1 drive configuration activates a powerful 20 mA open-drain driver specifically designed for high-speed TWI.

For all high-speed signals, the printed circuit board (PCB) layout must ensure that connections are made using short PCB traces. Refer to the manufacturer's PCB design recommendations for additional information.

aQFN94 pin assignments

The aQFN94 package has 94 pins in addition to four corner pads and a die pad.

Figure 1. aQFN™ pin assignments, top view. Corner and die pad is not illustrated.

Table 2. aQFN™ pin assignments
Pin Name Function Description Recommended usage
A5 VBUS Power 5 V input for USB 3.3 V regulator  
A13 DECA Power Analog regulator supply decoupling  
A15 DECD Power Digital regulator supply decoupling  
A17 P1.13 Digital I/O General purpose I/O  
A19 VDD Power Power supply  
A21 DCC Power DC/DC converter output  
A23 DECN Power Regulator supply decoupling  
A25 N.C.      
A27 DECR Power Regulator supply decoupling  
B2 D+ USB USB D+  
B4 D- USB USB D-  
B6 DECUSB Power USB 3.3 V regulator supply decoupling  
B8 VDD Power Power supply  
B10 DCCD Power DC/DC converter output  
B12 N.C.      
B14 P1.15 Digital I/O General purpose I/O  
B16 P1.14 Digital I/O General purpose I/O  
B18 P1.12 Digital I/O General purpose I/O  
B20 P1.11 Digital I/O General purpose I/O  
B22 P0.31 Digital I/O General purpose I/O  
B24 P0.30 Digital I/O General purpose I/O  
B26 N.C.      
B28 VDD Power Power supply  
B30 XC2 Analog input Connection for 32 MHz crystal  
C1 VDD Power Power supply  
C31 XC1 Analog input Connection for 32 MHz crystal  
D2 N.C.      
E1 VDDH Power Power supply  
E31 VDD Power Power supply  
F2 N.C.      
G1 N.C.      
G31 DECRF Power RADIO power supply decoupling  
H2 N.C.      
J1 DCCH Power DC/DC converter output  
J31 N.C.      
K2 N.C.      
L1 VDD Power Power supply  
L31 ANT RF Single-ended antenna connection  
M2 P1.00 Digital I/O General purpose I/O  
N1

P0.00
XL1

Digital I/O
Analog input

General purpose I/O
Connection for 32 kHz crystal

 
N31 VDD Power Power supply  
P2 P1.01 Digital I/O General purpose I/O  
R1

P0.01
XL2

Digital I/O
Analog input

General purpose I/O
Connection for 32 kHz crystal

 
R31 P1.10 Digital I/O General purpose I/O  
T2 N.C.      
U1 VDD Power Power supply  
U31 P0.29 Digital I/O General purpose I/O  
V2

P0.04
AIN0

Digital I/O
Analog input

General purpose I/O
Analog input

 
W1

P0.02
NFC1

Digital I/O
NFC input

General purpose I/O
NFC antenna connection

 
W31 SWDCLK Debug Serial wire debug clock input for debug and programming  
Y2

P0.05
AIN1

Digital I/O
Analog input

General purpose I/O
Analog input

 
AA1

P0.03
NFC2

Digital I/O
NFC input

General purpose I/O
NFC antenna connection

 
AA31 SWDIO Debug Serial wire debug I/O for debug and programming  
AB2

P0.06
AIN2

Digital I/O
Analog input

General purpose I/O
Analog input

 
AC1 VDD Power Power supply  
AC31 nRESET Reset Pin RESET with internal pull-up resistor  
AD2

P0.07
AIN3

Digital I/O
Analog input

General purpose I/O
Analog input

 
AE1

P1.02
TWI

Digital I/O
TWI 1 Mbps

General purpose I/O
High-speed pin for 1 Mbps TWI

TWI
AE31

P0.28
AIN7

Digital I/O
Analog input

General purpose I/O
Analog input

 
AF2

P1.03
TWI

Digital I/O
TWI 1 Mbps

General purpose I/O
High-speed pin for 1 Mbps TWI

TWI
AG1 VDD Power Power supply  
AG31 N.C.      
AH2

P0.08
TRACEDATA3
SCK

Digital I/O
Trace data
SCK for SPIM4

General purpose I/O
Trace buffer TRACEDATA[3]
Dedicated pin for high-speed SPI

Trace, SPIM4
AJ1

P0.09
TRACEDATA2
MOSI

Digital I/O
Trace data
MOSI for SPIM4

General purpose I/O
Trace buffer TRACEDATA[2]
Dedicated pin for high-speed SPI

Trace, SPIM4
AJ31 VDD Power Power supply  
AK2

P0.10
TRACEDATA1
MISO

Digital I/O
Trace data
MISO for SPIM4

General purpose I/O
Trace buffer TRACEDATA[1]
Dedicated pin for high-speed SPI

Trace, SPIM4
AK4

P0.11
TRACEDATA0
CSN

Digital I/O
Trace data
CSN for SPIM4

General purpose I/O
Trace buffer TRACEDATA[0]
Dedicated pin for high-speed SPI

Trace, SPIM4
AK6

P0.12
TRACECLK
DCX

Digital I/O
Trace clock
DCX for SPIM4

General purpose I/O
Trace buffer clock
Dedicated pin for high-speed SPI

Trace, SPIM4
AK8

P0.14
IO1

Digital I/O
IO1 for QSPI

General purpose I/O
Dedicated pin for Quad SPI

QSPI
AK10

P0.15
IO2

Digital I/O
IO2 for QSPI

General purpose I/O
Dedicated pin for Quad SPI

QSPI
AK12

P0.17
SCK

Digital I/O
SCK for QSPI

General purpose I/O
Dedicated pin for Quad SPI

QSPI
AK14

P0.18
CSN

Digital I/O
CSN for QSPI

General purpose I/O
Dedicated pin for Quad SPI

QSPI
AK16 P0.20 Digital I/O General purpose I/O  
AK18 P0.22 Digital I/O General purpose I/O  
AK20 P0.23 Digital I/O General purpose I/O  
AK22 P1.05 Digital I/O General purpose I/O  
AK24 P1.07 Digital I/O General purpose I/O  
AK26 P1.09 Digital I/O General purpose I/O  
AK28

P0.25
AIN4

Digital I/O
Analog input

General purpose I/O
Analog input

 
AK30

P0.27
AIN6

Digital I/O
Analog input

General purpose I/O
Analog input

 
AL3 VDD Power Power supply  
AL5

P0.13
IO0

Digital I/O
IO0 for QSPI

General purpose I/O
Dedicated pin for Quad SPI

QSPI
AL7 VDD Power Power supply  
AL9

P0.16
IO3

Digital I/O
IO3 for QSPI

General purpose I/O
Dedicated pin for Quad SPI

QSPI
AL11 VDD Power Power supply  
AL13 P0.19 Digital I/O General purpose I/O  
AL15 P0.21 Digital I/O General purpose I/O  
AL17 VDD Power Power supply  
AL19 P1.04 Digital I/O General purpose I/O  
AL21 P1.06 Digital I/O General purpose I/O  
AL23 P1.08 Digital I/O General purpose I/O  
AL25 VDD Power Power supply  
AL27 P0.24 Digital I/O General purpose I/O  
AL29

P0.26
AIN5

Digital I/O
Analog input

General purpose I/O
Analog input

 
Corner pads  
A1 N.C.      
A31 N.C.      
AL1 N.C.      
AL31 N.C.      
Bottom of chip  
Die pad VSS Power Ground pad. Exposed die pad must be connected to ground (VSS) for proper device operation.  

This document was last updated on
2020-12-02.
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