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Omron HEM-Solar(HEM-4500-SOLE)
Solar-Assisted Blood Pressure Monitor - Live Teardown
DesignMedAnaheim CA / February 8 2011
David Carey VP Techn ical Intelligence / UBM Te [email protected]
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Copyright 2011 UBM, LLC
Background UBM TechInsights - Technical Intelligence and Intellectual Property Services
Chip-level Reverse Engineering
Teardown Reports & related research on Wireless, Mobile, Consumer Electronicsand Medical Devices
A Teardown covers: System architecture
physical implementation
Bill-of-Materials (BOM) and estimated Cost of Goods Sold (COGS)
System metrics.
Cellular Phones, Digital Cameras, Wireless Networking, Game Boxes,Multimedia, Medical, Broadband systems are primary areas of coverage.
Teardown analysis activities cover well over a decade of industry change andover 1000 product analyses.
http://www.ubmtechinsights.com/http://www.ubmtechinsights.com/reports-and-subscriptions/teardowns/http://www.ubmtechinsights.com/reports-and-subscriptions/teardowns/http://www.ubmtechinsights.com/http://www.ubmtechinsights.com/http://www.ubmtechinsights.com/ -
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Copyright 2011 UBM, LLC
Omron HEM-Solar .With the twist of solar -assisted charging...
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Copyright 2011 UBM, LLC
Omron HEM-Solar ..of a 2.4V / 600mAh NiMH cell. Twin AAAs provide a 3 rd Power Source.
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Copyright 2011 UBM, LLC
Omron HEM-Solar Five self-tapping screws hold the ABS- plastic enclosure together.
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Copyright 2011 UBM, LLC
Omron HEM-Solar ..a Two -Piece case, other than the LCD Window and Battery Door.
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Copyright 2011 UBM, LLC
Omron HEM-Solar Internal Screws hold Main Board and PCBs for LED and NiMH Connector.
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Copyright 2011 UBM, LLC
Omron HEM-Solar Plenty of hand-soldered wires connect power sources and LED
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Copyright 2011 UBM, LLC
Omron HEM-Solar A single CEM (FR-4 / Phenolic) Board holds most electronics.
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Copyright 2011 UBM, LLC
Omron HEM-Solar The LCD wraps around and mounts to the pressure sensor shield.
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Copyright 2011 UBM, LLC
Omron HEM-Solar Primary ICs are on one side of the PCB.
Toshiba#TMP86FS23UG*
8-bit Microcontroller
Seiko Instruments#S-93C56
1 Kbit Serial EEPROM
Toshiba#TC74VHC02
Quad NOR Gate
Linear Technology#LTC4060NiMH Charger
Seiko Instruments#S-817
50mA / 3.8V LDOVoltage Regulator
Seiko Instruments#S-8353
3.8V Step-Up SwitchingRegulator
*4.7mm x 4.7mm; 1999 ChipCopyright Date on die
LCD Connections
Pressure tube attach
Seiko Instruments#S-808
Voltage Detector
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Copyright 2011 UBM, LLC
Omron HEM-Solar On/Off Switch, Pressure Sensor, and Power Connects occupy Side 2.
On / Off Button Pressure Sensor
Solar Panel Connects
AAA Battery Connects
AC Adapter Connects
NiMH Battery Connects
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Copyright 2011 UBM, LLC
Omron HEM-Solar So whats going on with the Pressure Sensor?
Basically, a Pneumatic Capacitor.
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Copyright 2011 UBM, LLC
Omron HEM-Solar And What About that Solar Cell?
A 50mm x 70mm thin-film Si on Glass:Probably about 3V @ 50mA based onsize or 150mW output. NiMH battery israted at 1.44WH so ~10 hours to fullycharge the NiMH battery in principle.Manual says 35 hours charge time in
bright sun so some combination of paneloutput estimate error and/or chargingefficiency loss must be at work.
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Copyright 2011 UBM, LLC
Omron HEM-Solar Estimated BPM Operation Basics.
RingOscillator
Circuit uController
Sys: 120
Dia: 80
Pressurized Cuff output changes capacitance of Pressure Sensor, affecting Ring Oscillator (RO)Frequency.
Assuming the system works similar to aneroid
sphygomomanometer and stethoscope approach :
When pulse is first detected in uController byfrequency change, Systolic is recorded. Whenpulse fades (monitored in RO output frequencystabilizing), Diastolic pressure reading is captured.
Pressure Sensor
Inflation Bulb
Pressure Cuff
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Copyright 2011 UBM, LLC
Omron HEM-Solar Power Source Management (very speculative; no trace-out performed).
Solar Panel Connects (3-4V)
AC Adapter Connects (6V) NiMH Battery Connects (2.4V)
Transistor Network
Linear TechnologyNiMH Charger
ElectronicsDiode Check Valve ?
AAA Battery Connects (3V)
Down-regulation to 3.8V Step-up to 3.8V
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Copyright 2011 UBM, LLC
Omron HEM-Solar And Cost of parts? (very roughly..)
Case/Enclosures/Plastics: $5Solar Panel: $1.5Electronics: $7LCD: $2
Pneumatics: $10 AC Adapter: $2Manuals/Box/Bag: $1.5
Call it ~ $30
Retail Price of $140-$150
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Copyright 2011 UBM, LLC
Omron HEM-Solar Thank you for your time
Visit: www.ubmtechinsights.com/markets-served/medical-devices
http://www.ubmtechinsights.com/markets-served/medical-deviceshttp://www.ubmtechinsights.com/markets-served/medical-deviceshttp://www.ubmtechinsights.com/markets-served/medical-deviceshttp://www.ubmtechinsights.com/markets-served/medical-deviceshttp://www.ubmtechinsights.com/markets-served/medical-deviceshttp://www.ubmtechinsights.com/markets-served/medical-devices