K3
2W
061
K32W061/K32W041
IEEE 802.15.4 and Bluetooth LE 5.0 wireless microcontroller
Rev. 1.3 — May 2021
Product data sheet
1. General description
The K32W061 and K32W041 (called K32W061 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 includes a 2.4 GHz Bluetooth Low Energy 5 (supporting eight
simultaneous connections) compliant transceiver, a 2.4 GHz IEEE 802.15.4 compliant
transceiver and a comprehensive mix of analog and digital peripherals. Ultra-low current
consumption in both radio receive and transmit modes and also in the power down modes
allow use of coin cell batteries.
The product has 640 KB embedded Flash and 152 KB RAM 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 I
2
C interfaces, a DMIC subsystem
including a dual-channel PDM microphone interface with voice activity detector, one 12-bit
ADC, temperature sensor and comparator.
The K32W061 variant has an internal NFC tag with connections to the external NFC
antenna.
The Arm Cortex-M4 is a 32-bit core that offers system enhancements such as low power
consumption, enhanced debug features, and a high level support of the block integration.
The Arm Cortex-M4 CPU, operates at up to 48 MHz.
2. Features and benefits
2.1 Benefits
Very low current solution for long battery life
Single chip device to run stack and application
System BOM is low in component count and cost
Flexible sensor interfacing
Embedded NTAG on K32W061 device
Package
6 6 mm HVQFN40, 0.5 mm pitch
Lead-free and RoHS compliant
Junction temperature range:
40 C
to +125
C
NXP Semiconductors
IEEE 802.15.4 and Bluetooth Low Energy 5.0 wireless MCU
K32W061/K32W041
2.2 Radio features
2.4 GHz IEEE 802.15.4 2011 compliant
2.4 GHz Bluetooth Low Energy 5.0 compliant
Receiver current 4.3 mA
IEEE 802.15.4 Receiver sensitivity -100 dBm
Bluetooth Low Energy 5.0 2 Mb/s high data rate
Bluetooth Low Energy Receiver sensitivity -97 dBm
Improved co-existence with WiFi
Configurable transmit power up to +11 dBm, with 46 dB range
Transmit power / current +10 dBm / 20.3 mA
Transmit power / current +3 dBm / 9.4 mA
Transmit power / current 0 dBm / 7.4 mA
1.9 V to 3.6 V supply voltage
Antenna Diversity control
32 MHz XTAL cell with internal capacitors, able with suitable external XTAL to meet
the required accuracy for radio operation over the operating conditions
Integrated RF balun
Integrated ultra Low-power sleep oscillator
Deep Power-down current 350 nA (with wake-up on IO)
128-bit, 192-bit or 256-bit AES security processor
MAC accelerator with packet formatting, CRCs, address check, auto-acks, timers
2.3 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.
On-Chip memory
640 KB flash
152 KB SRAM
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.
K32W061/K32W041
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2020-2021. All rights reserved.
Product data sheet
Rev. 1.3 — May 2021
2 of 112
NXP Semiconductors
IEEE 802.15.4 and Bluetooth Low Energy 5.0 wireless MCU
K32W061/K32W041
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 ksamples/s (Max.). 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 and temperature sensors
Watchdog timer and POR
Standby power controller
Up to 22 Digital IOs (DIO)
1 x Quad SPIFI for accessing an external flash device
Integrated NTAG I
2
C plus device, NFC Forum Type 2, on K32W061 only
Random Number Generator engine
AES engine AES-128 to 256
Hash hardware accelerator supporting SHA-1 and SHA-256
EFuse:
128-bit random AES key
Configuration modes
Trimming
ISO7816 smart card digital interface which with a suitable external analogue device
can operate as a smart card reader
2.4 Low power features
Sleep mode supported, the CPU in low power state waiting for interrupt
Deep-sleep mode supported, the 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 wake-up 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
Dedicated low power timer, clocked by 32kHz XTAL, closely integrated with the
Bluetooth Low Energy link layer to maintain the timing reference through power down
cycles
K32W061/K32W041
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2020-2021. All rights reserved.
Product data sheet
Rev. 1.3 — May 2021
3 of 112
NXP Semiconductors
IEEE 802.15.4 and Bluetooth Low Energy 5.0 wireless MCU
K32W061/K32W041
3. Applications
Zigbee 3.0, Thread networks
Bluetooth Low Energy 5.0 networks
Robust and secure low-power wireless applications
Smart lighting, door locks, thermostats and home automation
Wireless sensor networks
4. Ordering information
Table 1.
Ordering information
Package
Name
K32W061
K32W041
Table 2.
K32W061
K32W041
HVQFN40
Description
Version
Plastic thermal enhanced very thin quad
SOT618-1
flat package; no leads; 40 terminals; body
6
6
0.85 mm
Type number
Ordering information details
Type number
Flash size
640 KB
SRAM size
152 KB
NTAG
yes
no
5. Marking
Table 3.
K32W061
K32W041
Marking codes
Type number
Marking code
K32W061
K32W041
K32W061/K32W041
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2020-2021. All rights reserved.
Product data sheet
Rev. 1.3 — May 2021
4 of 112
NXP Semiconductors
IEEE 802.15.4 and Bluetooth Low Energy 5.0 wireless MCU
K32W061/K32W041
6. Block diagram
Core
Cortex-M4
48 MHz
System
Watchdog timer
Memories
Flash
640 KB
SRAM
152 KB
Digital peripherals
2 × I
2
C
Serial wire debug
POR
2 × SPI
RF transceiver
Fast antenna
diversity
Brown-out
detectors
Analog peripherals
12-bit ADC
8 channels
2 × USART
DMA
Bluetooth 5
Power
management
controller
NFC Tag
(K32W061 Only)
1 × Analog
comparator
10 × PWM
1 × DMIC
IEEE 802.15.4
2011
1 × QSPI
Battery sensor
DC/DC converter
Clocks
32 MHz XTAL
oscillator
32.768 kHz Xtal
oscillator
Low frequency free
running oscillator
High frequency free
running oscillator
Temperature
sensor
Security
HASH
Timers
2 × Low power
counter/timer
1 × IR modulator
Up to 22 × GPIO
1 × ISO7816
Real time clock
AES 128/256
Random number
generator
2 × Wakeup timers
Fig 1.
High level hardware block diagram
K32W061/K32W041
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2020-2021. All rights reserved.
Product data sheet
Rev. 1.3 — May 2021
5 of 112
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