wireless communication & charging platform for solid state
TRANSCRIPT
Cactus Semiconductor
Also known as Cactus Custom Analog Design
Wireless Communication & Charging
Platform for Solid State Batteries in
Miniature Implantable Medical Devices
Andrew Kelly
Cactus Semiconductor Inc. September 17, 2013
2013 MEDICAL TECHNOLOGY CONFERENCE
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Wireless Communication & Charging
Platform for Solid State Batteries in
Miniature Implantable Medical Devices
Miniature Implantable Medical Devices
Solid State Batteries
Wireless Communication & Charging Platform
Conclusions
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Miniature Implantable Medical Devices
IMDs ~15 to 50cc
Chest/Abdomen
Long Leads/Catheters
Invasive Surgery
Pacemakers/Defibrillators
Spinal Cord Stimulators
Drug Infusion Pumps
MIMDs < 4cc
Head/Neck/Limbs
Small Leads/Catheters
Minimally Invasive
ECG/EEG Monitors
Peripheral Nerve Stimulators
Micro Infusion Pumps
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Miniature Implantable Medical Devices
Example: Vagus Nerve Stimulator
IMD Implanted in Chest
Leads Routed to Neck
Electrodes Attached to Nerve
Device Volume < 1cc
Small Enough to Implant at
Point of Therapy
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Batt
ery
Vo
lum
e (
cc)
Battery Capacity (mA-H)
Rechargeable Batteries Volume vs Capacity
Solid State Batteries
Extremely Low Volume – Required for MIMDs
Extremely Low Capacity
Solid
State
Batteries 9/21/2013
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Fabricated on Silicon Wafers
Standard Semiconductor Processes & Equipment
Functions like Standard Rechargeable Li-Ion Battery
Solid State Batteries
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Advantages
Low Cost
Small Footprint (~ 6x6mm for 50uA-H)
Low Profile (200u)
Custom Dimensions
Available in Standard IC Packages
Flip Chip & Die Stack Compatible
SMT/Reflow Tolerant (Automated Assembly)
Solid State Batteries
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Advantages
Simple Constant-Voltage Recharge
No current control required
Charging continues at very low current
Flat Voltage Profile (4.1 to 3.8V)
High Cycle Life (5000 Cycles)
Low Self-Discharge (2.5% per Year)
Fast Recharge (20 Minutes)
Safe (Non-Toxic)
Eco-Friendly (No Disposal Requirements)
Solid State Batteries
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Circuit Implications
Low Capacity (uA-H not mA-H)
High Cell Resistance (> 1KW near EOL)
Constant-Voltage Recharge
[Unique Circuit Solution Required]
Solid State Batteries
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Highlights
Near-Field Magnetic Induction [NFMI]
Short Range (< 20cm)
Low Frequency (< 1MHz)
One Link for Charging & Communication
Simultaneous Charging & Communication
Ultra-Low Power Timekeeping (200nW)
No Crystal Required
Zero Battery Power for Communication
Optimized for Solid State Batteries
Wireless Communication & Charging
Platform
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Features
Wireless Power Interface
Solid State Battery Charger
Bi-Directional Wireless Transceiver
Supply Monitors & Switches
Step-Down Voltage Regulators
Ultra-Low Power Timekeeping
Control/Calibration Registers
Serial Peripheral Interface
Wireless Communication & Charging
Platform
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Wireless Communication & Charging
Platform
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Advantages
Enables Solid State Batteries
Provides Wireless Communication
Supports Device Calibration
Reduces ASIC Development Time
Reduces ASIC Development Cost
Reduces ASIC Development Risk
Wireless Communication & Charging
Platform
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Wireless Power Interface
One Link for Charging & Communication
Simultaneous Charging & Communication
Doubled Output Voltage
Minimal External Components
Wireless Communication & Charging
Platform
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Wireless Power Interface
Wireless Communication & Charging
Platform
-6-5-4-3-2-10123456
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-10123456789
1011
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0123456789
101112
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TANK
RFIN
PWRIN
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Wireless Communication & Charging
Platform
Solid State Battery Charger
Supports Supply Voltage up to 20V
Automatic Supply Voltage Detection
4.1V Constant-Voltage Charging
Calibration for High-Precision Charging
Supports Charging Current up to 10mA
Built-In Charge Current Monitor
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Solid State Battery Charger
Wireless Communication & Charging
Platform
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Wireless Communication & Charging
Platform
Bi-Directional Wireless Transceiver
Simple Amplitude Modulation Scheme
Manchester Encoded Data
Integrated Demodulator & Decoder
Integrated Encoder & Modulator
Passive Transmitter (No Battery Power)
~ 150KHz Carrier Frequency
Programmable Baud Rates (600 to 9600)
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Bi-Directional Wireless Transceiver
Wireless Communication & Charging
Platform
-10123456789
1011
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0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 -0.10
0.10.20.30.40.50.60.70.80.9
11.1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 -0.10
0.10.20.30.40.50.60.70.80.9
11.1
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Supply Monitors & Switches
Charger, Battery, Circuit Supply Monitors
Automatic Supply Voltage Switching Charger to Battery / Battery to Circuit / Charger to Circuit
Low & Dead Battery Indicators
Programmable Thresholds
Calibration for High-Precision Monitoring
Manual Override Option
Wireless Communication & Charging
Platform
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Supply Monitors & Switches
Wireless Communication & Charging
Platform
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Step Down Voltage Regulators
2.5V Linear Regulator
Supports MCU & ASIC Digital Functions
Supports Load Current up to 10mA
On-Demand Operation (Normally-Off)
Ultra-Low Power 1.8V Linear Regulator
Supports Ultra-Low Power Timekeeping Function
Wireless Communication & Charging
Platform
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2.5V Voltage Regulator
Wireless Communication & Charging
Platform
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1.8V Voltage Regulator
Wireless Communication & Charging
Platform
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Ultra-Low Power Timekeeping
Ultra-Low Power Oscillator
128Hz Clock Output
Calibration for Precise Timing
Stable Frequency as Battery Decays
200nW – Including Voltage Regulator
40-bit Counter/Timer
Supports Real-Time Clock Functions
Read, Write, & Pause Functions
Low-Frequency Output for Supply Monitor
Wireless Communication & Charging
Platform
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Ultra-Low Power Oscillator
Wireless Communication & Charging
Platform
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Control Registers & SPI
Read/Write Control of Analog Functions
Supports Device Calibration
“Non-Volatile” with Valid Battery
Flexible Array Size (16 x 8 bits pages)
Standard 4-Wire Serial Interface (10MHz)
Block Read/Write Functions
Wireless Communication & Charging
Platform
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Extreme Miniaturization requires Solid State Batteries
Solid State Batteries have unique characteristics
Cactus’ Platform provides the infrastructure to build
into application-specific devices with Solid State
Batteries
Platform Includes Features common to most MIMDs
Reduces ASIC development Time, Cost, & Risk
Conclusions
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Contact Information
Cactus Semiconductor Inc. is a fabless semiconductor
company. We offer full turn-key product design and
production as well as integrated circuit design services.
Our expertise in power management and analog circuits
find value in products for medical and portable
applications.
Cactus Semiconductor Inc.
60 N. McClintock Drive, Suite #1, Chandler, AZ 85226 www.cactussemiconductor.com
Andy Kelly
480-497-4511 x203
9/21/2013