NXH2265UK: NFMI radio for wireless audio and data streaming

Overview

The NxH2265 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, a power management subsystem, and a set of standard interfaces.

The audio data path is based on hardware-accelerated audio processing blocks and is enhanced with a DSP. The integrated power management subsystem supports multiple power domains and requires a stable, fixed input supply.

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

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 codec for up to two audio channels
Integrated latency controller for one RX channel
Integrated adaptive sample rate converter for one RX channel Integrated CoolFlux DSP^® with SBC codec

Power management subsystem

Integrated supply management based on a stable, fixed input supply

Power consumption

Supports multiple low-power modes, with typical current consumption:

Power-down: 5 μA
Sleep: 150 μA
Carrier detect: 180 μA
Mono audio streaming - receive: 1700 μA (fs = 16 kHz; G.722)
Mono audio streaming - transmit: 1600 μA (fs = 16 kHz; G.722)
Bidirectional audio streaming: 3000 μA (fs = 48 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

WLCSP40 with dimensions of 2.25 mm × 3.45 mm (7.76 mm2)
Flexible I/O switch matrix with 19 pins
Configurable supply level for I/O
40 bumps with a minimum pitch of 400 μm
Backside coating