Overview

A secure and reusable medical patch for connected healthcare provides body temperature, oxygen saturation (SpO2) and heart rate monitoring over a secure Bluetooth® connection. This medical patch uses a rechargeable Li-ion battery for a small profile and enhanced reusability. An onboard battery charger uses a commonly available USB port for better charging accessibility.

System Benefits​:

  • MCU with integrated Bluetooth Low Energy (LE) 5.0 for secure connectivity.
  • Optimized for low current consumption and longer battery life using a 20mAh flexible pouch battery.
  • High-accuracy temperature sensing (±0.5 °C).
  • Photoplethysmography (PPG) and proximity sensor for monitoring of essential bio-data such as heart rate, respiratory rate and oxygen saturation (SpO2) with ±3.5% accuracy.
  • On-board Li-ion battery charger IC to recharge and monitor the battery with built-in protection features.
  • Supports firmware updates via USB.

Applications

  • Personal wearable health monitor
  • Medical health monitor

Winning Combinations Interactive Diagram

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4:3 ratio Sheet.1 Sheet.2 Sheet.3 Sheet.4 US103 US103 US103 USB USB USB Battery Charger Battery Charger Battery Charger LDO LDO LDO NGK NGK NGK Skin Contact for Temp Sense Skin Contact for Temp Sense Skin Contact for Temp Sense Battery Low LED Battery Low LED Battery Low LED UART (For Debug) UART (For Debug) UART (For Debug) Antenna Sheet.39 Sheet.40 Sheet.41 Sheet.42 Sheet.43 Sheet.58 Sheet.59 Sheet.60 Sheet.61 Sheet.65 Sheet.67 Sheet.69 Sheet.70 Sheet.71 Sheet.72 Sheet.76 Sheet.77 Sheet.79 Sheet.81 Sheet.83 Sheet.84 Sheet.85 Sheet.86 Sheet.88 Connector 1 Connector 1.90 Connector 1.91 3.25V – 4.2V 3.25V – 4.2V 3.25V – 4.2V 3.8 V nom 3V – 4.2V Range 20 mAh 3.8V nom 3V - 4.2V Range 20mAh 3.8V nom 3V - 4.2V Range 20mAh Sheet.95 Connector 1.98 3V 21.136 mA 1.5 mAmax Deep Sleep 3V 21.136 mA 1.5mAmax Deep Sleep 3V 21.136 mA 1.5mAmax Deep Sleep Connector 1.100 250 mAmax 250mAmax 250mAmax Sheet.102 Connector 1.103 Sheet.104 Sheet.105 Sheet.106 2 Communication Lines B.795 2 2 2 2 2 2 2 Sheet.112 3.25V – 4.2V nom 78 mA Active 3.25V – 4.2V nom 78mA Active 3.25V – 4.2V nom 78mA Active 3V nom 1.59 mA active 5 uA Idle 3V nom 1.59mA active 5uA Idle 3V nom 1.59mA active 5uA Idle Sheet.118 Sheet.51 Sheet.52 Sheet.53 Sheet.54 Sheet.55 Sheet.56 Sheet.57 Sheet.116 Sheet.117 Sheet.119 Sheet.120 Sheet.121 Sheet.122 Sheet.123 Sheet.124 Sheet.125 Sheet.126 Sheet.127 Sheet.128 32 MHz 32 MHz 32 MHz 32 MHz 32 MHz 32 MHz Sheet.131 Bluetooth Low Energy BLE 5.0 BLE 5.0 Sheet.134 Sheet.135 2 2 2 2 Sheet.140 Status, Fault Status, Fault Status, Fault 3V nom 1.1 mA Active 1 uA Idle 3V nom 1.1mA Active 1uA Idle 3V nom 1.1mA Active 1uA Idle Temperature Sensor Temperature Sensor Temperature Sensor Temperature Sensor Vdd Vdd Vdd EOC EOC EOC RESQ RESQ RESQ I2C I2C I2C 14Bit ADC 14Bit ADC 14Bit ADC HR Sensor HR Sensor HR Sensor HR Sensor Vdd Vdd Vdd VLED VLED VLED GPIO GPIO GPIO I2C I2C I2C MCU BLE 5.0 MCU Bluetooth Low Energy 5.0 MCU Bluetooth Low Energy 5.0 MCUBluetooth Low Energy 5.0 USB2.0 USB2.0 USB2.0 GPIO GPIO GPIO ADC ADC ADC Vdd Vdd Vdd GPIO GPIO GPIO UART UART UART RF Osc. RF Osc. RF Osc. 32 kHz RTC 32kHz RTC 32kHzRTC GPIO GPIO GPIO GPIO GPIO GPIO INT INT INT I2C I2C I2C

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Blog Post Jan 20, 2021