WISOL ATM100 User Manual

ATM100

OEM Integrators / User Manual

1. Introduction

The ATM100 module offers customers fast time to market with a mono, or stereo, wireless audio connection. The module

is optimized for low-cost, high-quality, easy-to-use wireless audio solutions for wireless subwoofer or wireless rear speaker

applications.

Avnera’s proprietary wireless system takes a new approach to wireless audio. The wireless protocol was designed from the

ground up and delivers uncompressed mono or stereo audio, with fixed latency over the air, without interference issues,

and with industry leading WiFi coexistence – even at close proximities to a WiFi device.

Avnera-enabled wireless modules offer a low-touch, easy-to-integrate wireless audio solution and enables fast time to

market by eliminating concerns about compliance, antenna tuning, and board optimization.

Modules based on Avnera’s AV6210 silicon provide breakthrough wireless audio functionality with fixed low-latency

point-to-point transport of uncompressed mono/stereo PCM audio data supporting a wide range of input sample rates. A

single I2S digital audio port is used for the module audio input/output.

2. Feature

 Product Size

‐ Module Size (mm): 40.4 (W) X 26.0 (L) X 3.2 (H)
‐ Antenna Type : PCB Printed Antenna

 Audio Interfaces

‐ I2S Digital Input/Output interface with >94dB end-to-end digital audio path

 2.4 GHz ISM band, continuous dynamic channel selection
 Forward error correction coding, error detection, and audio-specific error concealment

 Dual onboard printed PCB antennas for multipath and fading mitigation
 Auto-search/synch and dynamic channel selection
 Low, fixed latency of less than 20ms for typical audio applications
 24 pin FPC or pin header connector
 Sample rate converter: Support for 32 - 96kHz input sample rates
 Over-the-air upgrade capability
 Customizable firmware for simple, low-cost, sub-woofer amplifier implementations
 General purpose over-the-air (OTA) serial interface:

> 11 kbps, bi-directional, full duplex

 Support for amplifier control data, meta-data data, and remote commands

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ATM100

3. General Function

The ATM100 module is available in 2 variations; digital input transmitter module or digital output receiver module. There

is a separate I2S port for digital audio input and output functions and either of these can be configured to be a master or a

slave – only the input or output port can be active at any time. In addition, MCLK can be generated from the module, or

input to the module as required by the system application.

The highly integrated nature of the AV6210 transceiver IC results in few external components being required for the

ATM100 module design. 2 PCB antennas are used to achieve increased range, and to offer diversity, and the simple RF

path consists only of the antennas, associated tuning components, the RF switch and a LC balun connected to the AV6210

IC. A 16MHz crystal generates the AV6210 system clock signal used as the basis for all RF and digital audio signals. In

addition, a 2Mb flash memory stores the factory based firmware, as well as firmware upgrade images and configuration

parameters. The module firmware enables upgrades to be performed by the I2C slave interface or over-the-air. The module

can be controlled from an external host device via the I2C interface. The I2C master port allows the module to control

other system audio devices such as a sub-woofer amplifier system without having to add another MCU to the product

design. Up to a maximum of 17 GPIOs are supported with the ATM100 module including I2C and I2S signals. This large

number of GPIOs can be leveraged to Implement low cost sub-woofer designs as outlined below.

The ATM100 module offers a standard and low latency firmware with different over the air sample rate. While the

standard 22.2KSps over the air sample rate optimizes audio quality and WiFi coexistence performance; Lower audio

latency can be achieved by using the low-latency 44.4KSps over the air sample rate.

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Typical Sub-Woofer Implement

ATM100

A simple low cost implementation of a sub-woofer product design is shown in Figure 2. The sub amplifier consists of a

PWM chip plus an output stage device, but no external MCU is required as the ATM100 RX module performs the control

function using the I2C master communication port in conjunction with multiple GPIOs. +5V power and

an optional reset signal are supplied to the ATM100 RX module and I2C slave communication can be used to control the

module if required. Several GPIOs can be used to drive LEDs, or to connect to UI buttons. Typically 2 LEDs may be used

and 1 button for pairing purposes. Another button could be used, for example, to implement a “bass enhance” feature.

Another GPIO can be used to control the main power supply for the unit. The ATM100 RX module will remain always

powered up but a GPIO control line is used to enable/disable the higher voltage rail for the amplifier output circuitry. If the

wireless link is lost (when the sound bar, or ATM100 TX module is powered down) the ATM100 RX module can, after a

timeout period, power down the amplifier section to conserve power and to help meet energy start requirements.

The I2C master port from the ATM100 RX module can communicate, control, and initialize external audio ICs such as the

PWM chip in this example.

Other GPIOs can be used to detect fault conditions (over temperature etc) and notify the module. The audio is routed from

the ATM100 RX module to the amplifier circuit with the I2S output port which can be configured as either a master or a

slave as required. MCLK can also be generated from the SWA RX module as a ~12.288MHz clock if required.

I/O interfaces description

I/O interfaces Description

+5.0V supply The ATM100 module is configured to accept a nominal +5.0V supply.
Reset Active low reset input. This pin is driven from an open collector/drain device such that it can be

pulled to ground for the active reset state but, when released, must go to a high impedance state.
This pin should not be actively driven high, as the AV5100 internal reset circuit will not operate
correctly.

I2S In Port The I2S input port can be configured as a master or slave. Consequently BCLK and LRCK can

be either inputs or outputs. In addition, MCLK can be sourced by the module. Since the AV5100
IC contains a sample rate converter, MCLK is not required to be supplied to the module when it

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ATM100

is an I2S slave. CMOS 3.3V logic levels are used for all I2S signals.

I2S Out Port

I2C Slave Port

I2C Master Port

GPIOs 3.3V CMOS logic level GPIOs available to connect to other devices, or to use as UI supporting

The I2S output port can be configured as a master or slave. Consequently BCLK and LRCK can
be either inputs or outputs. In addition, MCLK can be sourced by the module. Since the AV5100
IC contains a sample rate converter, MCLK is not required to be supplied to the module when it
is an I2S slave. CMOS 3.3V logic levels are used for all I2S signals.
The I2C slave port can be used for external host communication and for module testing. It is
assumed that external pull up resistors are connected at the I2C master communicating with the
module.
The I2C master port is used to communicate with external audio devices such as a sub-woofer
amplifier or rear speaker. It is assumed that external pull up resistors are included on the
application board.

GPIOs for LED and button support. All supported GPIOs can be configured as outputs or inputs
with configurable pull-ups/pull-downs.

4. Electrical Specifications

Absolute Maximum Ratings

Absolute Maximum Ratings (AMR) are stress ratings only. AMR corresponds to the maximum value that can be applied

without leading to instantaneous or very short-term unrecoverable hard failure (destructive breakdown). Stresses beyond

those listed under AMR may cause permanent damage to the device.

Functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating

Range” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may adversely affect device

reliability.

Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at

the test conditions specified.

CONDITION MIN MAX

+5V Supply Voltage Input -0.3V 6.0V

Input Voltage Range – Digital Inputs -0.3V 3.6V

Operating Temperature -10ºC +70ºC

Storage Temperature -20ºC +80ºC

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Recommended operating Range

PARAMETER MIN TYP MAX UNIT

VDD, +5V Supply pin voltage 4.5 5.0 5.5 V

Ambient Temperature (TA) 0 60 ºC

Electrical Characteristics – DC

PARAMETER CONDITION MIN TYP MAX UNIT

TX Module Configuration Linked 35 mA

TX Module Configuration Searching 22 mA

TX Module Configuration Continuous TX 63 mA

ATM100

RX Module Configuration Linked 35 mA

Electrical Characteristics – RF TX/RX

Operating Conditions: VDD = 4.5 to 5.5V, TA = 0°C to +60 °C, RF Freq = 2403.35-2477.35MHz, measured at RF

test connector. Typical specifications at TA = 25°C, VDD = 5.0V

PARAMETER CONDITIONS MIN TYP MAX UNIT

RF Channel Frequency Range 2403.35 2477.35 MHz

TX Output power 2.5 dBm

RX Sensitivity -88.7 dBm

Range (NLOS) 15 m

Range (LOS) 50 m

Notes;

1) Sensitivity is defined as the onset of 0.2% BLER Clock Error Rate.

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