Product Info

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Features

Typical Applications

LM746 Bluetooth® Dual Mode Audio Module

Standalone (With Embedded Bluetooth® 5 Compliant Stack)

Bluetooth® 5 Compliant

Low Power Consumption

IC Antenna Onboard

Partial - SPP & GATT-Based Proﬁles

HSP, HFP, A2DP and AVRCP Audio Proﬁles

Application Firmware Support

Integrated 16-bit Stereo Audio CODEC

SBC, MP3 and AAC decoder

aptX® codec (including support for SCMS-T) and Faststream codec

CSR’s cVc noise-cancellation technology

I2S, PCM and SPDIF Audio Interfaces

UART and USB 2.0 (Full Speed) Serial Interfaces

6 Capacitive touch sensor input interfaces

Individual PWM blocks (3 on dedicated LED pads)

8 digital and 2 analogue I/O

Microphone input and Speaker output interfaces

23.9mm x 16mm x 2.3mm

SMT Side and Bottom Pads for easy production

See our website for this products certiﬁcations.

RoHS, REACH and WEEE

Wireless Headphones and Speakers

Hand-free Headsets

Automotive Infotainment systems

Home Entertainment Devices

Audio Adapters.

Overview

The LM746 Bluetooth® Dual Mode audio module is an extremely versatile and cost eective solution. Enabling audio data to be wireless-

ly communicated between audio devices. Using a Bluetooth® v2.0, v2.1 and Bluetooth® v4.0, v4.1, 5 connection. It’s sound enhancement

features, makes it a perfect ﬁt within your premium audio device. The sound enhancement features includes CSR’s aptX® audio technol-

ogy. Providing CD-like quality over a Bluetooth® connection. And CSR’s cVc audio technology for noise cancellation. Perfectly suited to

wireless headphones, speakers and hand-free headsets.

This standalone module allows the developer to connect a microphone, speakers, capacitive touch sensors and other I/O devices.

Running the user application without using an external MCU. LM oer application support to the developer and can create new user

applications for the module.

Your developed user application and settings can be preloaded to the LM746, simplifying the manufacturing and testing process. It’s

SMT side and bottom pads allows for easy integrations into your embedded system.

2.3mm

23.9mm

16mm

Part No

Revised

Product

18/APR/2018

See Last Page

LM746

Page 1 of 21

+44(0) 207 428 2647 | sales@lm-technologies.com

Summary of content (21 pages)

PAGE 1
LM746 Bluetooth® Dual Mode Audio Module Product LM746 Standalone (With Embedded Bluetooth® 5 Compliant Stack) Part No See Last Page Revised 18/APR/2018 m .9m 23 2.3mm 16m m Features F Bluetooth® 5 Compliant 8 digital and 2 analogue I/O Low Power Consumption Microphone input and Speaker output interfaces IC Antenna Onboard 23.9mm x 16mm x 2.
PAGE 2
LM746 Bluetooth® Dual Mode Audio Module Product LM746 Standalone (With Embedded Bluetooth® 5 Compliant Stack) Part No See Last Page General Speciﬁcation Wireless Bluetooth® Standard 5 Compliant (Dual Mode) Module Type Standalone (Conﬁgurable with AT Commands) Proﬁles HSP, HFP, A2DP, AVRCP, Partial-SPP and GATT-Based Hardware Chipset Qualcomm Antenna IC Antenna Onboard Microcontroller (MCU) 16-bit RISC 80 MHz MCU Flash Memory 16 Mbit RAM 56 KB Program Interface SPI Interfaces UART, P
PAGE 3
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Pin Outs 55 36 35 21 Pin 1 20 Pin Assignments Pin Name Type Supply Domain Description 1 GND Ground 0V Common Ground 2 AIO1 Bi-directional VDD_AUX (1.35V) Analogue input/output 3 AIO0 Bi-directional VDD_AUX (1.
PAGE 4
LM746 Bluetooth® Dual Mode Audio Module Product LM746 Standalone (With Embedded Bluetooth® 5 Compliant Stack) Part No See Last Page Pin Assignments Continued Pin Name Type Supply Domain Description 23 LED1 Open drain output PIO_POWER LED Driver 24 LED2 Open drain output PIO_POWER LED Driver 25 PIO0 Bi-directional with weak pull-down PIO_POWER Programmable input / output line 26 PIO1 Bi-directional with weak pull-down PIO_POWER Programmable input / output line 27 PIO2 Bi-dire
PAGE 5
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page General Electrical Speciﬁcation Absolute Maximum Ratings Min Max Recommended Operating Condition Min Max Storage Temperature -40° C +85° C Operating Temperature Range -20° C +75° C Supply Voltage (VCHG) -0.4V 5.75V Supply Voltage (VCHG) 4.75V / 3.10V 5.75V Supply Voltage (VBAT) -0.4V 4.4V Supply Voltage (VBAT) 2.5V 4.
PAGE 6
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Battery Charger Battery Charger Min Typ Max Unit Input Voltage, VCHG (a) 4.75 / 3.10 5.00 5.75 V Trickle Charge Mode Min Typ Max Unit Charge current Itrickle as percentage of fast charge current 8 10 12 % Vfast rising threshold - 2.9 - V Vfast rising threshold trim step size - 0.1 - V Vfast falling threshold - 2.
PAGE 7
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Stereo Codec: Analogue to Digital Converter Continued... Parameter Conditions THD+N ﬁn = 1kHz Min Typ Max Unit Fsample B/W = 20Hz--Fsample/2 (20kHz max) 8kHz - 0.004 - % 1.6Vpk-pk input 48kHz - 0.008 - % Digital gain Digital gain resolution = 1 / 32 -24 - 21.
PAGE 8
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Digital Digital Terminals Min Typ Max Unit VIL input logic level low -0.4 - 0.4 V VIH input logic level high 0.7xPIO_POWER - PIO_POWER+0.4 V Tr/Tf - - 25 ns VOL output logic level low, IOL = 4.0mA - - 0.4 V VIH output logic level high, IOH = -0.4mA .
PAGE 9
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Auxiliary DAC Auxiliary DAC Min Typ Max Unit Resolution - - 10 Bits Supply voltage, VDD_DAC 1.30 1.35 1.40 V Output voltage range 0 - 1.35 V Full-scale output voltage 1.30 1.35 1.40 V LSB size 0 1.32 2.64 mV Offset -1.32 0 1.
PAGE 10
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page RF Speciﬁcation: Temperature = +20° C Continued...
PAGE 11
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page 1. Serial Interface 1.2 Programming and Debug Interface LM746 provides a debug SPI interface for programming, conﬁguring (PS Keys) and debugging the LM746. Access to this interface is required in production. Ensure the 4 SPI signals and the SPI line are brought out to either test points or a header.
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LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page 3. Power Control and Regulation 3.1 Voltage Regulator Enable When using the integrated regulators the voltage regulator enable pin, VREG_ENABLE, enables the LM746 and the following regulators: -1.8V switch-mode regulator -1.35V switch-mode regulator -Low-voltage VDD_DIG linear regulator -Low-voltage VDD_AUX linear regulator The VREG_ENABLE pin is active high.
PAGE 13
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page 4. Battery Charger Continued... Figure 4.2.1: Battery Charger External Mode Typical Conﬁguration Figure 4.2.2: Optional Ancilliary Circuits In Figure 4.2.2, Optional fast charge,400mΩ = 500m. Connect VBAT_SENSE to VBAT if not using this circuit.
PAGE 14
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Figure 6.1 shows the system block diagram for the capacitive touch sensor interface. The interface depends on the capacitive touch sensor type. Therefore the overall control of the capacitive touch sensor interface resides in the VM, so it is easily modiﬁed in each end-user application.
PAGE 15
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page The internal capacitance is trimmed, putting it in the mid range of the ADC. This enables measurements from 0pF to 50pF, where a capacitive touch is between ±50fF and ±1pF.
PAGE 16
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) LM746 Page 16 of 21 Product LM746 Part No See Last Page +44(0) 207 428 2647 | sales@lm-technologies.
PAGE 17
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Physical Dimensions Top View 55 36 0.9 35 0.6 0.9mm 16mm 0.9mm Pin Spacing 1.70 Pin 1 1.20 20 5.6mm 22.7mm 23.9mm Front View 2.3mm 23.9mm Side View 2.3mm 16mm LM746 Page 17 of 21 +44(0) 207 428 2647 | sales@lm-technologies.
PAGE 18
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page PCB Footprint EDGE OF HOST PCB ( Optimal ) Optimal Placement Position Pin 1 Placement Note If the optimal placement position cannot be achieved, ensure there is no metal beneath the highlighted part of module. NB Aim to place the module away from interference. (i.e: place the module at the edge of the board.) NO METAL BENEATH THIS AREA Pin 1 55 36 35 0.9 16mm 0.
PAGE 19
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Last Page Tray Dimensions 314mm Quantitites 1 Tray = 30 modules 140mm 10 Trays = 300 modules 20 Trays = 600 modules The trays are stacked and inserted into an anti-static vacuum bag and the Anti-Static Label, Model Name Label and Moisture Sensitive Labels stuck on. drying agent Humidity Indicator Card Anti-static aluminium vacuum bag.
PAGE 20
LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Below Datasheet Version Notes v1.0 18 APR 2018 LM746 Page 20 of 21 Added version notes to datasheet. Added Bluetooth® 5 Complaint. +44(0) 207 428 2647 | sales@lm-technologies.
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LM746 Bluetooth® Dual Mode Audio Module Standalone (With Embedded Bluetooth® 5 Compliant Stack) Product LM746 Part No See Below LM746 Packaging Options LM746 Page 21 of 21 746-0420 LM746 Module MOD SMT PROG BT4.1 D/Mode FwA20Rx IC ANT TRAY 746-0421 LM746 Module MOD SMT PROG BT4.1 D/Mode FwA20HIC IC ANT TRAY +44(0) 207 428 2647 | sales@lm-technologies.