health and fitness analog solution -...

Health and Fitness Analog solution

1

Wenbin ZhuMedical BDMJune, 2015

A Broad MarketTI in Medical Devices Today

TI Solutions for Wearable Optical Bio-Sensing

- Industry’s Lowest Power- Industry’s Best PPG signal quality- Fitness parameters beyond just HR

TI HealthTechEngineering components for life.

What’s Pulse Oximeter

�Pulse oximeters are non-invasive devices used to measure blood-oxygen

saturation level.

�In blood, oxygen is carried by Hemoglobin(Hb), named HbO2, Oximeter uses

PPG(Optical) to measure saturation level of HbO2.

�PPG: Oxygenated blood HbO2 has wavelength dependent absorption

characteristic, absorption also depends on oxygen saturation level.

�Typical value is from 90% to 100%, can be lower to 60% .

EE Types of Pulse Oximeter

� Clinical health

� Patient Monitor(Pulse Oxi module)

� Home health / Telehealth

� Finger clip Pulse Oxi

� Portable Pulse Ox(including Watch type)

� Sport and Fitness

� Wrist trap Pulse Oxi(HRM)

� Watch type Pulse Oxi(HRM)

AFE44xx

Sports & Fitness HRM

Clinical Monitoring SpO2AFE4490

AFE4400Home Health & Fitness SpO2

Reduced Features

3.18mm x 3.18mm x 0.5mmWCSP packageVled_sup = Vfb + 0.5V

Released

Released

• TI provides complete portfolio of Integrated photometry solution from Clinical/home health SpO2 to sports/fitness HRM.

AFE4404

AFE4403

Released

Sports & Fitness HRM

2.6 mm x 1.6 mm, DSBGAI2C

Transmitter

� H-Bridge & Push/Pull LED Driver Config

� Dynamic range >95dB

� 8 bit programmable LED current 0 to 100mA

� Option for 3rd LED support

� Min LED on time 50uS

� Low power transmitter (100uA + Average LED current)

Receiver

� Pulse frequency 62.5Hz to 5000Hz

� Programmable TIA gain

� Low Power Receiver (<700uA) with 13 noise free bits.

� Min Receiver sample time 50uS

� Dynamic cycle-to-cycle power saving mode

� Digital ambient estimation and subtraction (separate

RED/IR ambient values)

Other Features

� Flexible Pulse Sequencing and Timing

� Flexible clocking (4-60MHz clock input)

� Cable On/Off detect

� Supplies (Rx: 2V to 3.6V, Tx: 3.3V to 5.25V)

� -20°C to 70°C

� Compact WCSP (3mm x 3mm x 0.5mm)

Features

AFE4403 Integrated Solution for Optical HRM & home pulse-ox)

AFE4404Ultra-small, Integrated AFE for Wearable Optical Bio-sensing

Features

Transmitter

� Supports common anode LED configurations

� Better than 100 dB of dynamic range

� 6-bit programmable LED current to 50 mA

� Programmable LED On-time

� Simultaneous 3rd LED support for optimized

SPO2/HRM or multi-wavelength HRM

Receiver

� 24-bit representation of the current input from a

photodiode in Twos complement format

� Individual DC offset subtraction DAC at TIA input for

each LED and ambient phase

� Digital ambient subtraction at ADC output

� Programmable transimpedance gain from 10K-2M

� 100 dB of dynamic range

� Dynamic power saving mode to reduce current to less

than 300 uA

Other Features

� Pulse frequency 10 SPS to 1000 SPS

� Flexible pulse sequencing and timing control

� Flexible clock options:

� External clocking: 4-60 MHz input clock

� Internal clocking: 4 MHz oscillator

� I2C interface

� Supplies (Rx: 2-3.6V, Tx: 3-5.2V, IO: 1.8-3.6V)

� Package: 2.6mmx1.6mm WCSP package, 0.5

mm pitch

� Specified Temperature Range: –20°C to 70°C

Summary

TI Information - NDA

Challenges TI Solution Competition

� Low power for longer battery life

� Skin tone variation

� Best signal for Motion cancellation Algorithms

� Performance with Glass

� Low temperature performance

� Ambient noise

AFE4404 enables the acquisition of the industry’s best PPG signal at wrist

across skin tones, enabling the acquisition of robust parameters beyond heart

rate at 90% lower LED current than competition!!

ADS1291/2ADS1191/2

Heart Rate MonitorBased on Bio-Potential Measurements

Reliable Continuous Heart Rate Monitoring : Where and How ??


PatchChest Strap

Ear buds

Tread Mill

Pulse-OxClips

Watches

Strap

Strap

Key Careabouts� - Convenience

� - Accuracy

� - Battery life

� - Connectivity

Challenges for each approach� Bio-potential

�Two (or 3) contacts with 2 to 4 inch separation�Motion artifacts�Dry Vs Wet electrodes�Location

� Photometry�Optimal sensor placement�Ambient light�Motion artifact�Power consumption

�A multi-faceted problem needing innovations in sensors, precision instrumentation and sophisticated algorithms!


ADS1291 | ADS1292 Complete Integrated AFE for Bio-potential based HRM

� Fully Integrated ECG Solution

� Multiple Channels with low noise PGA and 24-bit ADC

� ADS1291: 1 channel

� ADS1292: 2 channels

� Test Signals, RLD Amp, Oscillator, Reference

� Noise: 8uV p-p (150Hz BW, G=6)

� CMRR : 105dB with G = 6

� Continuous Lead Off detect option

� Pace Detect Channel Select (HW / SW)

� Low Power

� Less than 350µW

� Nap mode available on ADS1291

� 16 –Bit ADS1191 and ADS1192 also available

� Medical Instrumentation (ECG and EEG) including:– Patient monitoring: 1-channel ECG, heart-rate, AED� Portable sport and fitness applications

� 95% less PCB space necessary for 8-channel solution over discrete implementations

� Provides immediate notification if electrode becomes disconnected.

� Insures correct measurement even if external pacer is present.

� 95% less power than discrete solutions! Power down and standby options lengthen battery life for Holter and other portable applications.

Features Benefits

Applications

Packages: 32-pin TQFP (7mm x 7mm)

ADS1292

ADS1292

BioPotential AFE Roadmap

Integrated Respiration impedance

measurement

Nu

mb

er

of

Ch

an

ne

ls

4

8

16-bit

ADS119416-bit , 8kSPS

ADS119616-bit, 8kSPS





6

ADS1298R24-bit, 32kSPS

Resolution



24-bit

3

2

1






NEWADS129324-bit, 6.4kSPS


LMT70: + 0.1ºC Precision Analog Temp Sensor, RTD and Precision NTC Thermistor IC

14

Applications

Features Benefits

LMT70/LMT70A+ 0.1ºC Precision Analog Temperature Sensor

• Temperature accuracy/error:

±0.13°C max at 30°C

±0.36°C max from -55°C to 150°C

• ±0.1°C matching of two LMT70A

• Power supply 2.0V to 5.5V

• Power supply current <12uA

• Linear output slope: -5.19mV/°C

• Output enable switch

• 0.88mm x 0.88mm WLCSP package

• Human Body Temperature Monitor

• Medical/Fitness Wearables & Thermometer

• Internet of Things (IoT) Sensor Nodes

• Industrial RTD (Class AA) or Precision

NTC/PTC Thermistor Replacement

• Heat Cost Allocator

• Metering Temperature Compensation

• Reduce manufacturing cost by eliminating

temperature calibration

• Eliminate sorting of temp sensor for

matching drives down production cost

• Eliminate full-temp range multi-point

calibration (unlike RTD/NTC Thermistor)

• 100x lower power than Precision RTD/NTC

• Reduce PCB size and system cost

LMT70 in WLCSP (4-bump ball grid) 0.88mm x 0.88mm

Accuracy vs. Temperature

(based on testing of 38 units)

Linearity: Output vs. Temperature

Very linear – no needs for complex linearization &

expensive sorting of sensors

LMT70 / 70A – Superior Linearity & Accuracy

LMT70 ±0.1ºC Precision Analog Temp Sensor Medical/Fitness Sport Wearable

• ±0.1°C accurate from 32°C to 42°C• 12 uA supply current • 0.8mm x 0.8mm 4-ball WLCSP• 0.1°C matching accuracy [1]

• Super accurate ±0.5ºC from 32ºC to 42ºC• Very low power in micro-amp range• Smallest footprint• Matching accuracy for heat transfer calc

Why LMT70Application Need or Care About

Building

Ambient

Skin

[1] LMT70A has device-to-device matching accuracy of 0.1°C

Thank you

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