NXH2261UK: NFMI radio for wireless audio and data streaming

Overview

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.

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Features

Controller subsystem

Customer programmable Arm Cortex-M0 ultra-low power for system configuration and control
I²C-bus/SPI slave control interface
Flexible interfaces: UART, GPIO, SWD, SPI master, I²C-bus master
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