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$: BlueCore5-MM Headset Design Master Class - edatop.com · BlueCore5-MM Headset Design Master Class Alex Yang CSR Taiwan, Applications Manager)RU*RHUWHN2QO\ ... • Advanced DSP based$
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BlueCore5-MM Headset Design Master Class

Alex YangCSR Taiwan, Applications Manager

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Contents

• Available Bluetooth Headsets

• BlueCore5 Multimedia Headset

• BlueVox DSP Headset

• Bluetunes ROM Stereo Headset

• Conclusions

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Available Bluetooth Headsets

• DEV-PC-1508, Stereo headset, BlueCore3 Multimedia• DEV-PC-1641, Mono headset, BlueCore3-Audio Flash, BlueCore4-

Audio Flash, BlueCore4-Audio ROM• DEV-PC-1645, Stereo headset, BlueCore5-Multimedia External• RED-PC-105B, Mono headset, BlueCore4-Audio ROM, QFN, 2

layer PCB• RED-PC-116, Dual mic mono headset, BlueCore5-Multimedia

External• RED-PC-119, BlueVox DSP mono headset, BlueCore5-Multimedia

ROM• RED-PC-123, BlueVox2 mono headset, BlueCore6 Audio ROM• RED-PC-126, BlueCore4 Audio ROM, QFN, mono headset, very

small outline, 4 layer board • RED-PC-138, Bluetunes ROM, BlueCore5-Multimedia ROM, stereo

headset

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Available Bluetooth Headsets

MAIN PART

HEADPHONE/LINE OUT

USB CONN.

BUTTONS/KEYS

BATTERY

PIO INTERFACE

DEB

UG

INTE

RFA

CE

ANTENNA CONNECTOR

BATTERY ON-OFF

MIC CONNECTOR

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Contents

• Bluetooth Headsets




• Conclusions

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Reference Design RED-PC-116For Goertek Only

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Reference DesignFor Goertek Only

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Dual Mic Block Diagram

RF Front End

Mini USB connectorPower, USB, SPI

BlueCore5-MM External

26MHz

External Flash

MMI3 LEDS

3 ButtonsMono speaker

Mic input

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2 Mic Mono Headset SchematicFor Goertek Only

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RF Front End

• Antenna PCB meander line, 0 to -3dBi, limited ground plane• LC bias network, 1.5volts• L multilayer, LQP type, Q 10/20 at 2GHz, 15nH, 90mA• Antenna matching network

• Balanced balun/filter/matching

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Balun Selection Criteria

Output Power Flatness

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Harmonics

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EDR Rx Sensitivity

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• Most important: are the parts in mass production?

• Can a customer purchase 10000 in six weeks time?

• Recommended: Taiyo Yuden FI212C245036T

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Voltage Regulators and Power SupplyFor Goertek Only

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Voltage Regulators and Power Supply

• Lithium Ion Polymer battery, 3.7 volts, 130mAh, 0 to 45C charge,-20C to + 60C discharge.

• Lower cost to put the battery protection on the board?

• BlueCore5-Multimedia External contains four regulators. – Switch mode for the main 1.8volt, 200mA, SMP– 3 Linear regulators

• 3 linear regulators– 1.5volt for the digital core and analogue radio, 115mA (low)– 1.5volt for the audio section (audio)– 1.8volt to replace the switch mode regulator, 200mA (high)

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Switch Mode Regulator

• The inductor is the energy storage device. ESR 0.5 to 0.9 • ESR 0.5 ringing, 0.9 poorer efficiency, dropout and transient

response• Recommend ESR 0.7 • Coilcraft ME3220-223KL, 3.2mm x 2.5mm, ESR = 0.787, 580mA,

wire wound• Taiyo Yuden LB2518T220M, 2.5mm x 1.8mm, ESR = 0.77, 220mA,

multilayer

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Switch Mode Regulator

• Cell designed to use 4.7μF capacitor for smoothing • VDD_SMPS_CORE provides bias voltage for the control circuit• Switch mode regulator enabled by holding VREGENABLE_H. This

is connected through a push button, PIO line.

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Linear Regulator

• 1.8volt linear regulator unused in this design• 1.8volt SMS provides input to the 1.5volt core regulator, VREGIN_L• 1.5volt regulator enabled by taking VREGENABLE_L high to

1.8volts• 1.5Volt core regulator requires 2.2μF as a minimum for stability with

ESR > 2, hence the use of the 2.2Ω resistor• Note 1.5μF provides only 10° of phase margin. This is insufficient.

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Linear Regulator

• Omission of 2.2Ω and 2.2μF will cause frequency drift issues

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Supply Pins

• AIO pins are supplied internally by VDD_ANA rail• 5 x 1.8 volts VDD_MEM pins decoupled with 10nF

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Supply Pins

• VDD_PIO and VDD_PADS tolerant of 1.7volts to 3.6volts VDD_PIO supplies PIO[1:3] and AUX_DAC

• VDD_PADS supplies PCM and SPI interfaces, PIO[4:15], RST#

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USB Interface

• If USB is required, VDD_USB must be supplied by a 3.3volt low drop out regulator (LDO)

• XC6219A332MRN from Torex. If alternative is used, take care thatthe regulator contains an internal 100kΩ resistor on the control pin

• External regulator supplied by VBUS and enabled by 1.8volts fromthe regulator

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USB interface

• ESD/EMI filter, also contains impedance matching network• USB also requires pull up resistor on the DP line. This is internal to

BlueCore5-MM External• If USB interface is not required, tie VDD_USB to 1.8volts, omit the

ESD protection and connect USB_P/N to ground

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UART Interface

• UART is supplied through VDD_USB, hence this voltage must be present on the connector for this interface to operate

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Battery Charger

• Battery charger internal to BlueCore5-MM External• External charge voltage is connected via USB connector

directly to A12

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Battery Charger

• Lithium Polymer cell terminal voltage monitored internally by BlueCore5-MM external

• At a predefined level, headset turns off. Threshold set in firmware• 10μF or 4.7μF capacitor provides stability• Battery is connected to B13

– Input to switch mode regulator– Output from charger to battery

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Reset Circuitry

• Reset each time charging voltage is applied to the USB connector• Advantage: if firmware latches up, the headset can be reset without

having to wait until the battery resets• Disadvantage: lost call if charger is connected• Sometimes also have mechanical reset switch

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Headset PlacementFor Goertek Only

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Placement Order

• Antenna• RF components, BlueCore5-MM External and flash• Components whose placement is determined by the plastics: LEDs,

buttons, connectors• Crystal and load capacitors• Audio components• BlueCore5-MM External decoupling• Switch mode power supply• Linear regulator passives• Battery charger interface• USB supply• Test points

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PCB Routing Order

• BlueCore5-MM External power and ground planes. Fan out all interface lines

• Crystal and RF• Audio• Power supply blocks, battery charger• PIO and AIO• Flash• USB lines• Rest

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Contents





• Conclusions

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BlueVox DSP Overview

• High end ROM mono headset designs • Low cost, single chip, ROM solution incorporating DSP• Bluetooth v2.1 + EDR

– Includes “secure simple paring”• BOM < $6• Lowest power consumption

– > 8 hours talk time• Simultaneous connection of multiple devices• Advanced DSP based CVC echo and noise reduction

– 1 mic CVC as standard– 2 mic CVC, licensed upgrade with extra 20dB noise reduction

• Auristream– High voice quality CODEC

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BlueVox DSP Documentation

• Example Design

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BlueVox DSP QFN Package

• 7 x7 x 0.9 mm, 0.5mm pitch

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BlueVox DSP HardwareFor Goertek Only

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BlueVox DSP SchematicFor Goertek Only

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BlueVox DSP RF Front EndFor Goertek Only

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BlueVox DSP Power SuppliesFor Goertek Only

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BlueVox DSP Crystal and LEDFor Goertek Only

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BlueVox DSP Reset and EEPROMFor Goertek Only

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BlueVox DSP Balun Selection

• Output power, absolute level– Maximised at amplifier gains of 63 and 46, basic rate

• Output power, flatness– Across the band between 1dB and 0.5dB, basic rate

• Rx sensitivity– Optimised for basic rate, three qualification channels

• Rx sensitivity– Optimised for EDR, π/4DQPSK and 8DPSK on Channels 30 and

62• Harmonic rejection

– Basic rate, ETSI and FCC Part 15 requirements• Physical dimensions• Cost• Availability• BlueVox DSP: Soshin DFB81F107-CSR

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BlueVox DSP PCB LayoutFor Goertek Only

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Contents





• Conclusions

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Bluetunes ROM Stereo Headset

• Very preliminary development schematic and layout, RED-PC 138

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Contents

• Introduction





• Conclusions

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Conclusions

• Overview available headset designs

• Reviewed in detail 2 mic headset design, BlueCore5-Multimedia

• Reviewed in detain mono headset design, BlueVox DSP

• Very preliminary information for a stereo headset, Bluetunes ROM

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Final Slide

Any Questions?

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bluecore5-mm headset design master class - edatop.com · bluecore5-mm headset design master class...

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