Health and Fitness Analog solution -...
Transcript of Health and Fitness Analog solution -...
Health and Fitness Analog solution
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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 ??
TI Information - NDA
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!
TI Information - NDA
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
ADS119816-bit, 8kSPS
ADS129424-bit , 32kSPS
ADS129624-bit , 32kSPS
ADS129824-bit, 32kSPS
6
ADS1298R24-bit, 32kSPS
Resolution
ADS1296R24-bit, 32kSPS
ADS1294R24-bit, 32kSPS
24-bit
3
2
1
ADS119216-bit , 2kSPS
ADS129224-bit , 2kSPS
ADS1292R24-bit, 2kSPS
ADS119116-bit , 2kSPS
ADS129124-bit , 2kSPS
NEWADS129324-bit, 6.4kSPS
ADS129924-bit, 16kSPS
LMT70: + 0.1ºC Precision Analog Temp Sensor, RTD and Precision NTC Thermistor IC
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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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