NXP Semiconductors K32W061 User manual

K32W061
K32W061/K32W041 User
Manual
UM11323
Rev. 1.1 — June 2020 User manual
Document information
Info Content
Keywords Arm Cortex-M4, microcontroller, Zigbee, Thread, Bluetooth Low Energy
Abstract K32W061/41 User Manual

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User manual Rev. 1.1 — June 2020 2 of 350
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
NXP Semiconductors UM11323
K32W061/41 User manual
11111111
Revision history
Rev Date Description
1.1 2020/06 •Updated ISP usage restrictions in the Section 38.8 “Usage restrictions”.
•Updated to reserve the CT32B_IR[7:6].
1.0 2020/04 Initial public release

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1.1 Introduction
The K32W061 and K32W041 (called K32W061/41 throughout this document) are
ultra-low power, high performance Arm® Cortex®-M4 based wireless microcontrollers
supporting Zigbee 3.0, Thread and Bluetooth Low Energy 5.0 networking stacks to
facilitate home and building automation, smart lighting, smart locks and sensor network
applications.
The K32W061/41 includes a 2.4 GHz IEEE 802.15.4 and a Bluetooth Low Energy
compliant transceivers and a comprehensive mix of analog and digital peripherals.
Ultra-low current consumption in radio receive and radio transmit modes allows use of
coin cell batteries.
K32W061/041 has 640 KB embedded Flash, 152 KB RAM and 128 KB ROM memory.
The embedded flash can support Over The Air (OTA) code download to applications. The
devices include 10-channel PWM, two timers, one RTC/alarm timer, a Windowed
Watchdog Timer (WWDT), two USARTs, two SPI interfaces, two I2C interfaces, a DMIC
subsystem with dual-channel PDM microphone interface with voice activity detector, one
12-bit ADC, temperature sensor and comparator.
The K32W061 variant has an internal NTAG I2C plus NFC tag and connections for the
external NFC antenna. The tag is an NXP device NT3H2211.
The Arm Cortex-M4 is a 32-bit core that offers system enhancements such as low-power
consumption and enhanced debug features. The Arm Cortex-M4 CPU, operating at up to
48 MHz, incorporates a 3-stage pipeline, uses a Harvard architecture with separate local
instruction and data buses as well as a third bus for peripherals, and includes an internal
prefetch unit that supports speculative branching. The Arm Cortex-M4 supports
single-cycle digital signal processing and SIMD instructions. Debug is supported using the
Serial Wire Debug.
Refer to the data sheet for complete details on specific products and configurations.
1.2 Features
1.2.1 Microcontroller features
•Application CPU, Arm Cortex-M4 CPU:
–Arm Cortex-M4 processor, running at a frequency of up to 48 MHz.
–Arm built-in Nested Vectored Interrupt Controller (NVIC)
–Memory Protection Unit (MPU)
–Non-maskable Interrupt (NMI) with a selection of sources
–Serial Wire Debug (SWD) with 8 breakpoints and 4 watchpoints
–System tick timer
–Includes Serial Wire Output for enhanced debug capabilities.
UM11323
Chapter 1: Introductory Information
Rev. 1.1 — June 2020 User manual

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Chapter 1: Introductory Information
•On-Chip memory:
–640 KB flash
–152 KB SRAM
–128 KB ROM
•12 MHz to 48 MHz system clock speed for low-power
•2 x I2C-bus interface, operate as either master or slave
•10 x PWM
•2 x Low-power timers
•2 x USART, one with flow control
•2 x SPI-bus, master or slave
•1 x PDM digital audio interface with a hardware based voice activity detector to
reduce power consumption in voice applications. Support for dual-channel
microphone interface, flexible decimators, 16 entry FIFOs and optional DC blocking
•19-channel DMA engine for efficient data transfer between peripherals and SRAM, or
SRAM to SRAM. DMA can operate with fixed or incrementing addresses. Operations
can be chained together to provide complex functionality with low CPU overhead
•Up to four GPIOs can be selected as pin interrupts (PINT), triggered by rising, falling
or both input edges
•Two GPIO grouped interrupts (GINT) enable an interrupt based on a logical
(AND/OR) combination of input states.
•32-bit Real Time clock (RTC) with 1 s resolution. A timer in the RTC can be used to
wake from Sleep, Deep-sleep and Power-down, with 1 ms resolution
•Voltage Brown Out with 8 programmable thresholds
•8-input 12-bit ADC, 190 kS/sec. HW support for continuous operation or single
conversions, single or multiple inputs can be sampled within a sequence. DMA
operation can be linked to achieve low overhead operation.
•1 x analog comparator
•Battery voltage measurement
•Temperature sensor
•Watchdog timer and POR
•Standby power controller
•Up to 22 Digital IOs (DIO)
•1 x Quad SPIFI for reading or writing to external flash device
•NTAG NFC Forum Type 2 on K32W061 only
•Random Number Generator engine
•AES engine
•Hash hardware accelerator
•EFuse :
–128-bit random AES key
–configuration modes
–Trimming

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Chapter 1: Introductory Information
1.2.2 Radio features
•2.4 GHz IEEE 802.15.4 compliant
•2.4 GHz Bluetooth Low Energy 5.0 compliant
•Receive current 4.3 mA
•IEEE 802.15.4 receiver sensitivity -100 dBm
•Bluetooth Low Energy 5.0 2 Mbps high data rate
•Bluetooth Low Energy Receiver Sensitivity -97 dBm
•Improved co-existence with WiFi
•Flexible output power up to 11 dBm, programmable with 46 dB range
•Transmit power +10 dBm current 20.3 mA
•Transmit power +3 dBm current 9.4 mA
•Transmit power 0 dBm current 7.4 mA
•1.9 V to 3.6 V supply voltage
•32 MHz XTAL cell with internal capacitors, able with suitable external XTAL, to meet
the required accuracy for radio operation over the operating conditions
•Antenna Diversity control
•Integrated RF balun
•Integrated ultra Low-power sleep oscillator
•Deep Power-down current 350 nA (with wake-up from IO)
•128-bit or 256-bit AES security processor
•MAC accelerator with packet formatting, CRCs, address check, auto-acks, timers
1.2.3 Low-power features
•Sleep mode supported, CPU in low-power state waiting for interrupt
•Deep-sleep mode supported, CPU in low-power state waiting for interrupt, but extra
functionality disabled or in low-power state compared to sleep mode
•Power Down mode, main functionality powered down, wakeup possible from IOs,
wakeup possible from some peripherals (I2C, USART, SPI) in a limited function mode
and low-power timers
•Deep power down, very low-power state with option of reset triggered by IOs, 350 nA
•41-bit and 28-bit Low power timers can run in power down mode, clocked by 32 kHz
FRO or 32 kHz XTAL. Timers can run for over one year or 2 days
•Bluetooth Low Energy specific low-power timers closely linked to the Bluetooth Low
Energy link layer to manage timing in low-power states.

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Chapter 1: Introductory Information
1.3 Block diagram
1.4 Architectural overview
The Arm Cortex-M4 includes three AHB-Lite buses, one system bus and the I-code and
D-code buses. One bus is dedicated for instruction fetch (I-code), and one bus is
dedicated for data access (D-code). The use of two core buses allows for simultaneous
operations if concurrent operations target different devices.
A multi-layer AHB matrix connects the CPU buses and other bus masters to peripherals in
a flexible manner that optimizes performance by allowing peripherals on different slaves
ports of the matrix to be accessed simultaneously by different bus masters. More
information on the multilayer matrix can be found in Section 2.1.3 “AHB multilayer matrix”.
Connections in the multilayer matrix are shown in Figure 1. Note that while the AHB bus
itself supports word, halfword, and byte accesses, not all AHB peripherals need or provide
that support.
Fig 1. Chip block diagram
Master
Slave
pmu_top
Analog
Comparator
ADC
XTAL
Oscillator
Temperature
Sensor
Free Running
Oscillator
192 MHz
Free Running
Oscillator
Power
On
Reset
Brown Out
Detectors
DCDC
Converter
1 MHz
Free Running
Oscillator
core_digita
l
AHB Multi-Layer Matrix
APB Bridge 0
Arm
Cortex-M4
with MPU
Quad
SPIFI
MODEM
System
APB Bridge 1
FLASH
640K
(1 * 640K)
FLASH
Functional
Muxes I/Os
Func
MUX
0
Func
MUX
1
Func
MUX
2
Func
MUX
21
Func
MUX
20
Func
MUX
...
AES
256
ADC
Controller
Debug
Access
Port
DMA
Controller
(19channels)
DMIC
USART 0 SPI 0
GPIO
(22I/Os)
Power
Management
Controller
(PMC)
Watchdog
Timer
Pin
Interrupt
&
Pattern
Matching
USART 1 SPI 1
I2C 1
ISO7816
PWM
(10 channels)
Peripheral
Input Mux Infra Red
Random
Number
Generator
Async
System
Config.
CTimers
0 / 1
GPIO
Global
Interrupt
Sync.
System
Config.
RTC I/O
Config.
Wake-up
Timers 0/1
Sleep
Config.
Reset
Controller
Clock
Controller
Analog
Interrupt
Controller
Zigbee/
Thread
MAC
MoDem
AHB
Master
RFP
MODEM
Zigbee/
Thread
MODEM Flash
Controller
SRAM
88 K
(2*4K + 2*8K
+ 4*16K)
SRAM 0
SRAM
Controller
SRAM
64 K
(4 * 16K)
SRAM 1
SRAM
Controller
ROM
128 K
(1*128K)
ROM
Code
Patch
radio_to
p
32 MHz
XTAL
Oscillator
Radio
LDOs
Band Gap
(Bias)
Hash
(SHA-1,
SHA-2 256)
I2C 0
LINK
LAYER MODEM
Analog Mixed SignalDigital Units System Control Bus
(AMBA AHB/APB)
ROM, RAM, FLASH
I2C 2
eFUSE
1K
(64 * 16)
OTP
OTP
Controller
Interface
Key:
(NTAG control)
Bluetooth LE Bluetooth LE
32 kHz 32 kHz

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Chapter 1: Introductory Information
APB peripherals are connected to the AHB matrix via two APB buses using separate
slave ports from the multilayer AHB matrix. This allows for better performance by reducing
collisions between the CPU and the DMA controller, and also for peripherals on the
asynchronous bridge to have a fixed clock that does not track the system clock. Note that
APB, by definition, does not directly support byte or halfword accesses.
The multi-layer has several master interfaces and slave interfaces. The following table
shows which slaves the master interfaces are able to access; indicated with a 'x'. Where a
block has '-REG' in the name, this shows that it is the register interface of the block.
SPIFI-MEM is the direct memory access function of the block and not the register
interface.
1.5 Arm Cortex-M4 processor
The Cortex-M4 is a general purpose 32-bit microprocessor, which offers high performance
and very low-power consumption. The Cortex-M4 offers a Thumb-2 instruction set, low
interrupt latency, interruptible/continuable multiple load and store instructions, automatic
state save and restore for interrupts, tightly integrated interrupt controller, and multiple
core buses capable of simultaneous accesses.
Table 1. AHB master interface accessibility to the slaves
AHB slave AHB master
CPU DMA HASH MODEM
I-code D-code System
Slave port 0 Flash x x x x
Slave port 1 ROM x x x
Slave port 2 SRAM0 x x x x x
Slave port 3 SRAM1 x x x x x
Slave port 4 SPIFI-MEM x x
Slave port 5 APB bridge 0 x x
Slave port 6 APB bridge 1 x
Slave port 7 SPIFI-REG x x
GPIO x x
DMA-REG x x
AES x x
ADC x x
DMIC x x
USART0 x x
USART1 x x
SPI0 x x
SPI1 x x
HASH x x
Slave port 8 Bluetooth Low Energy
Link Layer
xx
Zigbee/Thread MODEM x x
Zigbee/Thread MAC x x

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Chapter 1: Introductory Information
A 3-stage pipeline is employed so that all parts of the processing and memory systems
can operate continuously. Typically, while one instruction is being executed, its successor
is being decoded, and a third instruction is being fetched from memory.
Information about Cortex-M4 configuration options can be found in Chapter 43 “Arm
Cortex-M4 Appendix”.

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2.1 General description
The K32W061/41 incorporates several distinct memory regions. Figure 1 shows the
overall map of the entire address space from the user program viewpoint following reset.
The APB peripheral area (detailed in Figure 1) is divided into fixed 4 KB slots to simplify
addressing.
The registers incorporated into the CPU, such as NVIC, SysTick, and sleep mode control,
are located on the private peripheral bus.
2.1.1 Main SRAM
The main SRAM is composed of 152 KB of on-chip static RAM memory. The SRAM is
accessed through two controllers SRAM-CTRL0 and SRAM-CTRL1. SRAM-CTRL0 gives
access to the first 88 KB and SRAM-CTRL1 gives access to the remaining 64 KB. The
memory is contiguous within the two separate regions but not contiguous from
SRAM-CTRL0 to SRAM-CTRL1. Each SRAM has a separate clock control and power
switch.
2.1.1.1 SRAM usage notes
The SRAM controllers, SRAM-CTRL0 and SRAM-CTRL1, are placed on different AHB
matrix ports. This allows user programs to potentially obtain better performance by
dividing RAM usage among the ports. For example, simultaneous access to SRAM0 by
the CPU and SRAM1 by the system DMA controller does not result in any bus stalls for
either master.
Generally, data being communicated via peripherals will be accessed by the CPU at some
point, even when peripheral data is mainly being transferred via DMA. So, in order to
minimizing data read/write stalls, data buffers may be placed in RAMs on different AHB
matrix ports. For instance, if DMA is writing to one buffer on a specific AHB matrix port
while the CPU is reading data from a buffer on a different AHB matrix port, there is no stall
for either the CPU or the DMA. Sequences of data from the same peripheral could be
alternated between RAM on each port. This could be helpful if DMA fills or empties a RAM
buffer, then signals the CPU before proceeding on to a second buffer. The CPU would
then tend to access the data while the DMA is using the other RAM.
2.1.2 Memory mapping
The overall memory map and also details of the APB peripheral mapping are shown in
Figure 1 “Main memory map”.
UM11323
Chapter 2: Memory Map
Rev. 1.1 — June 2020 User manual
Table 2. SRAM configuration
SRAM Controller SRAM-CTRL0 SRAM-CTRL1
(total main SRAM = up to 152 KB)
Size 88 KB Up to 64 KB
Address range 0x0400 0000 to 0x0401 5FFF 0x0402 0000 to 0x0402 FFFF

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Chapter 2: Memory Map
1) The private peripheral bus includes CPU peripherals such as the NVIC, SysTick, and the core control registers.
2) Memory region 0x00000000 to 0x000001FF can be mapped to flash, as shown here, or ROM or RAM depending upon the
Vector Table Remapping setting.
Fig 2. Main memory map
FLASH Memory
Reserved
(Do not access)
0x0000_0000
0x0301_FFFF
0x4000_0000
640 KBytes
APB Bridge 0
(Synchronous)
0xFFFF_FFFF
General Purpose I/O
Synchronous System
Configuration
ROM
0x0009_FFFF
0x0300_0000
Main Memory Map (AHB) APB Bridge 0 Memory Map
32-bit Words
32-bit Words
Reserved
(Do not access)
SRAM-CTRL0
(2*4KB, 2*8KB, 4*16KB)
0x0400_0000
0x0401_5FFF
Reserved
Quad SPIFI
(Memory-Mapped Space)
0x1000_0000
0x103F_FFFF
Reserved
Reserved
(Do not access)
0x4001_FFFF
0x4008_0000
0x4008_3FFF
SPIFI Registers
DMA Controller
AES-256
Reserved
(Do not access)
Private Peripheral
Bus (Internal)
Private Peripheral
Bus (External)
Reserved
(Do not access)
0x4008_4FFF
0x4008_5FFF
0x4008_6FFF
0x4008_4000
0x4008_5000
0x4008_6000
0xE003_FFFF
0xE00F_FFFF
0xE004_0000
0xE000_0000
128 KBytes
88 KBytes
4 MBytes
4 KBytes
768 KBytes
16 KBytes
4 KBytes
128 KBytes
4 KBytes
0x4000_0000
Reserved (do not
access) 4 KBytes
0x4000_1000
Reserved (do not
access) 4 KBytes
0x4000_2000
I2C 0 4 KBytes
0x4000_3000
I2C 1 4 KBytes
0x4000_4000
I2C 2 4 KBytes
0x4000_5000
ISO7816 4 KBytes
0x4000_6000
IR Modulator 4 KBytes
0x4000_7000
Code Patch
Module 4 KBytes
0x4000_8000
Flash Controller 4 KBytes
0x4000_9000
WWDT 4 KBytes
0x4000_A000
RTC 4 KBytes
0x4000_B000
PWM 4 KBytes
0x4000_C000
4 KBytes
0x4000_D000
Random Number
Generator
4 KBytes
0x4000_E000 INPUT MUX
4 KBytes
0x4000_F000
IO CONFIG
(IOCON)
4 KBytes
0x4001_0000
GPIO Pattern
Interrupt (PINT)
4 KBytes
0x4001_1000
CTIMER 0
4 KBytes
0x4001_2000
RFP MODEM 4 KBytes
0x4001_3000
4 KBytes
0x4001_4000
Reserved
(Do not access)
0x4001_5000
40 KBytes
GPIO Group
Interrupt (GINT0)
APB Bridge 1
(Asynchronous)
0x4002_0000
0x4003_FFFF
CTIMER 1
APB Bridge 1 Memory Map
4 KBytes
0x4002_0000
Reserved
(Do not access) 116 KBytes
0x4002_1000
SRAM 0 (16 KB)
SRAMs Memory Map
0x0400_0000
SRAM 1 (16 KB)
0x0400_4000
SRAM 2 (16 KB)
0x0400_8000
SRAM 5 (8 KB)
0x0400_C000
0x0401_4000
128 KBytes
0x4003_FFFF
0x4002_0FFF
0x4001_FFFF
32-bit Words
PMC
4 Kbytes
Asynchronous
System Configuration
0x4002_1FFF
0x4002_2000
0x4002_2FFF
0x4002_3000
4 KBytes
4 KBytes
SRAM 6 (4 KB)
SRAM 7 (4 KB)
SRAM 8 (16 KB)
SRAM 9 (16 KB)
0x0401_5000
0x0402_0000
0x0402_4000
0x0401_5FFF
0x0402_3FFF
0x0401_4FFF
0x0401_3FFF
0x0400_BFFF
0x0400_7FFF
0x0400_3FFF
0x0402_7FFF
IEEE 802.15.4 MODEM
IEEE 802.15.4 MAC
0x400A_0000
0x400B_0000
0x400B_1000
0x400A_FFFF
0x400B_0FFF
0x400B_1FFF
4 Kbytes
4 Kbytes
64 Kbytes
Reserved
(Do not access)
Reserved
(Do not access)
4 Kbytes
4 Kbytes
0x4008_8FFF
0x4008_7FFF
0x4008_7000
0x4008_8000
Reserved
(Do not access)
0x4008_9000
ADC 4 Kbytes
0x4008_9FFF
DMIC 4 Kbytes
0x4008_A000
0x4008_AFFF
USART 0
USART 1
4 Kbytes
4 Kbytes
0x4008_CFFF
0x4008_BFFF
0x4008_B000
0x4008_C000
0x4008_D000
SPI 0 4 Kbytes
0x4008_DFFF
SPI 1 4 Kbytes
0x4008_E000
0x4008_EFFF
SRAM 3 (16 KB)
SRAM 4 (8 KB)
0x0400_FFFF
0x0401_0000
0x0401_2000
0x0401_1FFF
SRAM-CTRL1
(4*16KB)
64 KBytes
0x0402_0000
0x0402_FFFF
Reserved SRAM 10 (16 KB)
SRAM 11 (16 KB)
0x0402_8000
0x0402_FFFF
0x0402_C000
0x0402_BFFF
Reserved
(Do not access) 4 KBytes
0x4001_6000
Hash 4 Kbytes
0x4008_F000
0x4008_FFFF
Bluetooth LE
LINK LAYER
Bluetooth LE
MODEM

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Chapter 2: Memory Map
2.1.3 AHB multilayer matrix
The K32W061/41 uses a multi-layer AHB matrix to connect the CPU buses and other bus
masters to peripherals in a flexible manner that optimizes performance by allowing
peripherals that are on different slave ports of the matrix to be accessed simultaneously
by different bus masters. Figure 1 and Tabl e 1 shows details of the potential matrix
connections.
2.1.4 Memory Protection Unit (MPU)
The Cortex-M4 processor has a memory protection unit (MPU) that provides fine grain
memory control, enabling applications to implement security privilege levels, separating
code, data and stack on a task-by-task basis. Such requirements are critical in many
embedded applications.
The MPU register interface is located on the private peripheral bus and is described in
detail in Ref. 1 “Cortex-M4 TRM”.
2.1.5 Vector table remapping
The Cortex boot address is 0x00000000. The memory map in Figure 1 shows flash at this
address. However, the first 512 bytes in the memory map are treated specially to give
flexibility to the location of the vector table. This region will be referred to here as the
Vector Table Region.
The MEMORYREMAP MAP field is used to indicate if this Vector Table Region is located
in ROM, Flash or RAM. Depending upon this setting, cortex address 0x00000000 to
0x000001FF will either access the bottom of the ROM, the bottom of the Flash or the
bottom of SRAM0.
The default / reset condition is to use ROM code so that a known boot sequence is
followed. Typically, during the boot sequence, this setting is changed so that the vector
table region is in Flash. This allows application specific interrupt vectors to be used.

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User manual Rev. 1.1 — June 2020 12 of 350
3.1 How to read this chapter
K32W061/41 package is a HVQFN40 (6x6 mm). The pinout and IO cells are consistent
across all product types except for the NTAG antenna connections.
There are some functional differences between the IO cells used for different digital pins
and these are presented in this chapter.
3.2 Pinout diagram
UM11323
Chapter 3: Pin and Pad Descriptions
Rev. 1.1 — June 2020 User manual
Fig 3. Pinout diagram
(QT-9YKVJQWV06#)KVKU0%
SS(RF)
SS(RF)
RSTN

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Chapter 3: Pin and Pad Descriptions
3.3 Pinout signaling descriptions
Table 3. Pin descriptions
Symbol Pin Type Default at reset Description
XTAL_P 1 System crystal oscillator 32 MHz
XTAL_N 2 System crystal oscillator 32 MHz
PIO0 3 IO GPIO0[1] GPIO0 — General Purpose digital Input/Output 0
USART0_SCK — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - synchronous clock
USART1_TXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - transmit data output
PWM0 — Pulse Width Modulator output 0
SPI1_SCK — Serial Peripheral Interface-bus 1 clock input/output
PDM0_DATA — Pulse Density Modulation Data input from digital
microphone (channel 0)
PIO1 4 IO GPIO1[1] GPIO1 — General Purpose digital Input/Output 1
USART1_RXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - receive data input
PWM1 — Pulse Width Modulator output 1
SPI1_MISO — Serial Peripheral Interface-bus 1 master data input
PDM0_CLK — Pulse Density Modulation Clock output to digital
microphone (channel 0)
PIO2 5 IO GPIO2[1] GPIO2 — General Purpose digital Input/Output 2
SPI0_SCK — Serial Peripheral Interface-bus 0 clock input/output
PWM2 — Pulse Width Modulator output 2
SPI1_MOSI — Serial Peripheral Interface-bus 1 master output slave
input
USART0_RXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - receive data input
ISO7816_RST — RST signal, output, for ISO7816 interface
MCLK — External clock, can be provided to DMIC IP
PIO3 6 IO GPIO3[1] GPIO3 — General Purpose digital Input/Output 3
SPI0_MISO — Serial Peripheral Interface-bus 0 master input
PWM3 — Pulse Width Modulator output 3
SPI1_SSELN0 — Serial Peripheral Interface-bus 1 slave select not 0
USART0_TXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - transmit data output
ISO7816_CLK — Clock output for ISO7816 interface

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Chapter 3: Pin and Pad Descriptions
PIO4 7 IO GPIO4[1][2] GPIO4 — General Purpose digital Input/Output 4
SPI0_MOSI — Serial Peripheral Interface-bus 0 master output slave
input
PWM4 — Pulse Width Modulator output 4
SPI1_SSELN1 — Serial Peripheral Interface-bus 1 slave select not 1
USART0_CTS — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - Clear To Send input
ISO7816_IO — IO of ISO7816 interface
RFTX — Radio Transmit Control Output
ISP_SEL — In-System Programming Mode Selection
PIO5/ISP_ENT
RY
8 IO GPIO5/ISP_EN
TRY[1][3]
GPIO5/ISP_ENTRY — General Purpose digital Input/Output 5;
In-System Programming Entry
SPI0_SSELN — Serial Peripheral Interface-bus 0 slave select not
SPI1_MISO — Serial Peripheral Interface-bus 1 master data input
SPI1_SSELN2 — Serial Peripheral Interface-bus 1 slave select not 2
USART0_RTS — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - Request To Send output
RFRX — Radio Receiver Control Output
PIO6 9 IO GPIO6[1] GPIO6 — General Purpose digital Input/Output 6
USART0_RTS — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - Request to Send output
CT32B1_MAT0 — 32-bit CT32B1 match output 0
PWM6 — Pulse Width Modulator output 6
I2C1_SCL — I2C-bus 1 master/slave SCL input/output
USART1_TXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - transmit data output
ADE — Antenna Diversity Even output
SPI0_SCK — Serial Peripheral Interface 0- synchronous clock
PIO7 10 IO GPIO7[1] GPIO7 — General Purpose digital Input/Output 7
USART0_CTS — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - Clear to Send input
CT32B1_MAT1 — 32-bit CT32B1 match output 1
PWM7 — Pulse Width Modulator output 7
I2C1_SDA — I2C-bus 1 master/slave SDA input/output
USART1_RXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - receive data input
ADO — Antenna Diversity Odd Output
SPI0_MISO — Serial Peripheral Interface-bus 0 master input
Table 3. Pin descriptions
Symbol Pin Type Default at reset Description

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PIO8/TXD0 11 IO GPIO8[1][4] GPIO8 — General Purpose digital Input/Output 8
USART0_TXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - transmit data output
CT32B0_MAT0 — 32-bit CT32B0 match output 0
PWM8 — Pulse Width Modulator output 8
ANA_COMP_OUT — Analog Comparator digital output
PDM1_DATA — Pulse Density Modulation Data input from digital
microphone (channel 1)
SPI0_MOSI — Serial Peripheral Interface-bus 0 master output slave
input
RFTX — Radio Transmit Control Output
PIO9/RXD0 12 IO GPIO9[1][5] GPIO9 — General Purpose digital Input/Output 9
USART0_RXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - receive data input
CT32B1_CAP1 — 32-bit CT32B1 capture input 1
PWM9 — Pulse Width Modulator output 9
USART1_SCK — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - synchronous clock
PDM1_CLK — Pulse Density Modulation Clock output
to digital microphone (channel 1)
SPI0_SSELN — Serial Peripheral Interface-bus 0 slave select not
ADO — Antenna Diversity Odd Output
PIO10 13 IO GPIO10[1] GPIO10 — General Purpose digital Input/Output 10
CT32B0_CAP0 — 32-bit CT32B0 capture input 0
USART1_TXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - transmit data output
RFTX — Radio Transmit Control Output
I2C0_SCL — I2C-bus 0 master/slave SCL input/output (open drain)
SPI0_SCK — Serial Peripheral Interface-bus 0 clock input/output
PDM0_DATA — Pulse Density Modulation Data input from digital
microphone (channel 0)
PIO11 14 IO GPIO11[1] GPIO11 — General Purpose digital Input/Output 11
CT32B1_CAP0 — 32-bit CT32B1 capture input 0
USART1_RXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - receive data input
RFRX — Radio Receiver Control Output
I2C0_SDA — I2C-bus 0 master/slave SDA input/output (open drain)
SPI0_MISO — Serial Peripheral Interface-bus 0 master input slave
output
PDM0_CLK — Pulse Density Modulation Clock output to digital
microphone (channel 0)
Table 3. Pin descriptions
Symbol Pin Type Default at reset Description

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PIO12/SWCLK 15 IO SWCLK GPIO12 — General Purpose digital Input/Output 12
SWCLK — Serial Wire Debug Clock
PWM0 — Pulse Width Modulator output 0
I2C1_SCL — I2C-bus 1 master/slave SCL input/output (open drain)
SPI0_MOSI — Serial Peripheral Interface-bus 0 master output slave
input
ANA_COMP_OUT — Analog Comparator digital output
IR_BLASTER — Infra-Red Modulator output
PIO13/SWDIO 16 IO SWDIO GPIO13 — General Purpose digital Input/Output 13
SPI1_SSELN2 — Serial Peripheral Interface-bus 1, slave select not 2
SWDIO — Serial Wire Debug Input/Output
PWM2 — Pulse Width Modulator output 2
I2C1_SDA — I2C-bus 1 master/slave SDA input/output (open drain)
SPI0_SSELN — Serial Peripheral Interface-bus 0, slave select not
PIO14/ADC0 17 IO GPIO14[1] ADC0 — ADC input 0
GPIO14 — General Purpose digital Input/Output 14
SPI1_SSELN1 — Serial Peripheral Interface-bus 1, slave select not 1
CT32B0_CAP1 — 32-bit CT32B0 capture input 1
PWM1 — Pulse Width Modulator output 1
SWO — Serial Wire Output
USART0_SCK — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - synchronous clock
MCLK — External clock, can be provided to DMIC IP
RFTX — Radio Transmit Control Output
PIO15/ADC1 18 IO GPIO15[1] ADC1 — ADC input 1
GPIO15 — General Purpose digital Input/Output 15
SPI1_SCK — Serial Peripheral Interface-bus 1, clock input/output
ANA_COMP_OUT — Analog Comparator digital output
PWM3 — Pulse Width Modulator output 3
PDM1_DATA — Pulse Density Modulation Data input from digital
microphone (channel 1)
I2C0_SCL — I2C-bus 0 master/slave SCL input/output (open drain)
RFRX — Radio Receiver Control Output
PIO16/ADC2 19 IO GPIO16[1] ADC2 — ADC input 2
GPIO16 — General Purpose digital Input/Output 16
SPI1_SSELN0 — Serial Peripheral Interface-bus 1, slave select not 0
PWM5 — Pulse Width Modulator output 5
PDM1_CLK — Pulse Density Modulation Clock output to digital
microphone (channel 1)
SPIFI_CSN — Quad-SPI Chip Select Not, output
ISO7816_RST — RST signal, output, for ISO7816 interface
I2C0_SDA — I2C-bus 0 master/slave SDA input/output (open drain)
Table 3. Pin descriptions
Symbol Pin Type Default at reset Description

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VDDE 20 P VDDE — Supply voltage for IO
PIO17/ADC3 21 IO GPIO17[1] ADC3 — ADC input 3
GPIO17 — General Purpose digital Input/Output 17
SPI1_MOSI — Serial Peripheral Interface-bus 1, master output slave
input
SWO — Serial Wire Output
PWM6 — Pulse Width Modulator output 6
SPIFI_IO3 — Quad-SPI Input/Output 3
ISO7816_CLK — Clock output for ISO7816 interface
CLK_OUT — Clock out
PIO18/ADC4 22 IO GPIO18[1] ADC4 — ADC input 4
GPIO18 — General Purpose digital Input/Output 18
SPI1_MISO — Serial Peripheral Interface-bus 1, master data input
CT32B0_MAT1 — 32-bit CT32B0 match output 1
PWM7 — Pulse Width Modulator output 7
SPIFI_CLK — Quad-SPI Clock output
ISO7816_IO — IO of ISO7816 interface
USART0_TXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - transmit data output
PIO19/ADC5 23 IO GPIO19[1] ADC5 — ADC input 5
GPIO19 — General Purpose digital Input/Output 19
ADO — Antenna Diversity Odd Output
PWM4 — Pulse Width Modulator output 4
SPIFI_IO0 — Quad-SPI Input/Output 0
USART1_RXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - receive data input
CLK_IN — External clock
USART0_RXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 0 - receive data input
PIO20/ACP 24 IO GPIO20[1] ACP — Analog Comparator Positive input
GPIO20 — General Purpose digital Input/Output 20
IR_BLASTER — Infra-Red Modulator output
PWM8 — Pulse Width Modulator output 8
RFTX — Radio Transmit control Output
SPIFI_IO2 — Quad-SPI Input/Output 2
USART1_TXD — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - transmit data output
Table 3. Pin descriptions
Symbol Pin Type Default at reset Description

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Chapter 3: Pin and Pad Descriptions
[1] I: input at reset.
[2] For standard operation (normal boot or ISP programming mode), this pin should be high during the release
of reset. If there is no external driver to this pin, then the internal pull-up will keep this pin high.
[3] ISP programming mode: leave pin floating high during reset to avoid entering UART programming mode or
hold it low to program.
[4] In ISP mode, it is configured to USART0_TXD.
[5] In ISP mode, it is configured to USART0_RXD.
3.4 Pin properties
Tab le 4 presents the different functionality and default states of the pins. PIO10 and PIO11
have IO cells that support true I2C operation and also general purpose digital modes. The
reset and test reset pins support a narrow range of functionality. All other digital IOs are
standard GPIO IO cells.
PIO21/ACM 25 IO GPIO21[1] ACM — Analog Comparator Negative input
GPIO21 — General Purpose digital Input/Output 21
IR_BLASTER — Infra-Red Modulator output
PWM9 — Pulse Width Modulator output 9
RFRX — Radio Receiver Control Output
SWO — Serial Wire Output
SPIFI_IO1 — Quad-SPI Input/Output 1
USART1_SCK — Universal Synchronous/Asynchronous
Receiver/Transmitter 1 - synchronous clock
TRST 26 G TRST — must be connected to GND
RSTN 27 I RSTN — Reset Not input
VBAT 28 P VBAT — Supply voltage DCDC input
LX 29 LX — DCDC filter
VSS(DCDC) 30 G VSS(DCDC) — ground for DCDC section
FB 31 FB — DCDC Feedback input
VDD(PMU) 32 P VDD(PMU) — supply voltage for PMU section
XTAL_32K_P 33 crystal oscillator 32.768 kHz
XTAL_32K_N 34 crystal oscillator 32.768 kHz
VDD(RADIO) 35 P VDD(RADIO) — supply voltage for radio section
VSS(RF) 36 G VSS(RF) — RF ground
RF_IO 37 IO RF_IO — RF antenna, RF pin which can be considered as RF
Input/output. The radio transceiver is connected here.
VSS(RF) 38 G VSS(RF) — RF ground
LB 39 NFC tag antenna input B
LA 40 NFC tag antenna input A
exposed die
pad
G must be connected to RF ground plane
Table 3. Pin descriptions
Symbol Pin Type Default at reset Description

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Chapter 3: Pin and Pad Descriptions
Table 4. Pin properties
Pin No. Pin Name Default status after POR Pullup/ Pulldown enable after POR Pullup/ pulldown selection after POR Slew rate after POR Passive pin filter after POR Open drain enable at reset Open drain enable control Pin interrupt Fast capability
1XTAL_P 
2XTAL_N 
3PIO0 Hi-ZYPUSSNNNYN
4PIO1 Hi-ZYPDSSNNNYN
5PIO2 Hi-ZYPDSSNNNYN
6PIO3 Hi-ZYPUSSNNNYN
7PIO4 Hi-ZYPUSSNNNYN
8PIO5/ISP_ENTRY Hi-ZYPUSSNNNYN
9PIO6 Hi-ZYPDSSNNNYN
10PIO7 Hi-ZYPDSSNNNYN
11PIO8/TXD0 Hi-ZYPUSSNNNYN
12PIO9/RXD0 Hi-ZYPUSSNNNYN
13 PIO10 Hi-Z N[1] SSNNYYY
14 PIO11 Hi-Z N[1] SSNNYYY
15PIO12/SWCLK Hi-ZYPUSSNNNYN
16PIO13/SWDIO Hi-ZYPUSSNNNYN
17PIO14/ADC0 Hi-ZYPUSSNNNYN
18PIO15/ADC1 Hi-ZYPUSSNNNYN
19PIO16/ADC2 Hi-ZYPUSSNNNYN
20 VDDE 
21PIO17/ADC3 Hi-ZYPDSSNNNYN
22PIO18/ADC4 Hi-ZYPDSSNNNYN
23PIO19/ADC5 Hi-ZYPDSSNNNYN
24PIO20/ACP Hi-ZYPDSSNNNYN
25PIO21/ACM Hi-ZYPUSSNNNYN
26 TRST[2] Hi-Z N N
27 RSTN H Y PU N
28 VBAT 
29 LX 
30 VSS(DCDC) 
31 FB 

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Chapter 3: Pin and Pad Descriptions
[1] External pullup required
[2] Tie to ground for functional mode
32 VDD(PMU) 
33 XTAL_32K_P 
34 XTAL_32K_N 
35 VDD(RADIO) 
36 VSS(RF) 
37 RF_IO 
38 VSS(RF) 
39 LB 
40 LA 
Table 4. Pin properties
Pin No. Pin Name Default status after POR Pullup/ Pulldown enable after POR Pullup/ pulldown selection after POR Slew rate after POR Passive pin filter after POR Open drain enable at reset Open drain enable control Pin interrupt Fast capability
Table 5: Abbreviation used in the Table 4
Properties Abbreviation Descriptions
Default status after POR Hi-Z High impedance
H High level
L Low level
Pullup/pulldown Enable after
POR
Y Enabled
N Disabled
Pullup/pulldown selection after
POR
PU Pullup (ie reg ICON.MODE = 0x0)
PD Pulldown (ie reg ICON.MODE = 0x3)
Slew rate after POR FS Fast slew rate
•For MFIO pads ie all except PIO10&11: IOCON.SLEW = 0 or
1, IOCON.SLEW1 = 1
•For IICFPGPIO pads ie PIO10&11: IOCON.SLEW = 1
SS Slow slew rate
•For MFIO pads ie all except PIO10&11: IOCON.SLEW = 0,
IOCON.SLEW1 = 0
•For IICFPGPIO pads ie PIO10&11: IOCON.SLEW = 0
Passive Pin Filter after POR N Disabled (ie reg IOCON.FILTEROFF = 1)
Y Enabled (ie reg IOCON.FILTEROFF = 0)