Design Files
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NFMI Radio for Wireless Audio and Data Streaming
The NXH2261UK is an ultra-low-power wireless single-chip solution optimized for audio and data communication. It uses a magnetic induction radio to provide a robust, tightly contained body area network around each user. It uses near field magnetic induction (NFMI) for wireless audio and data streaming.
It offers a fully integrated Arm® Cortex®-M0-based control subsystem, a magnetic induction (MI) transceiver, an audio data path, and a power management subsystem.
In addition to the Arm Cortex-M0, the control subsystem embeds a 512 kbit EEPROM and a set of standard interfaces.
The audio data path is based on hardware-accelerated audio processing blocks and can be enhanced with a user-programmable CoolFlux DSP®. The integrated power management subsystem supports multiple power domains and runs directly from a ZnAir or NiMH battery.
The device is available in a wafer-level chip-scale (WLCSP) package.
Product Details
Features
Controller subsystem
- Customer programmable Arm Cortex-M0 ultra-low power for system configuration and control
- I²C-bus/SPI follower control interface
- Flexible interfaces: UART, GPIO, SWD, SPI leader, I²C-bus controller
- Embedded low power 512 kbit EEPROM
Magnetic induction transceiver
- 596 kbit/s raw throughput
- Carrier frequency of 10.579 MHz
- On-chip tuning of coil resonator tank
- Programmable transmit power
- Integrated AGC
- Operation from internal oscillator
- Optimized protocol for low latency ear-to-ear communication
- Embedded network protocol for up to 15 devices
Audio data path
- I2S-bus audio interface
- Support for multiple audio sample frequencies up to 48 kHz
- Integrated MAC accelerator for MI radio
- Integrated audio G.722 and ADPCM codecs for up to four audio channels
- Integrated latency controller for two RX channels
- Integrated adaptive sample rate converter for two RX channels
- Integrated CoolFlux DSP with SBC codec
Power management subsystem
- Integrated battery management supporting ZnAir or NiMH batteries
- Integrated supply booster for transparent EEPROM operation
Power consumption
- Supports multiple low-power modes:
- Power-down: 5 μA
- Deep-sleep: 8 μA
- Sleep: 60 μA
- Carrier detect: 100 μA
- Mono audio streaming - receive: 1000 μA (fs = 20 kHz, G.722)
- Mono audio streaming - transmit: 1050 μA (fs = 20 kHz, G.722)
- Binaural audio streaming: 1300 μA (fs = 20 kHz, G.722)
- Mono audio streaming - receive: 2400 μA (fs = 44.1 kHz, SBC)
- Mono audio streaming - transmit: 2000 μA (fs = 44.1 kHz, SBC)
- Support for flexible slot allocation of the radio enabling better power tuning over the different use cases
- Integrated ultra-low-power oscillator and timer used in low-power modes
Package
- WLCSP48 with dimensions of 2.79 mm × 3.72 mm (10.38 mm2)
- Flexible I/O switch matrix with 19 pins
- Configurable supply level for I/O
- 48 bumps with a minimum pitch of 400 μm
- Backside coating
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