To succeed in the increasingly competitive home health care market, Consumer medical devices should offer the following features:
・ Ease of use
・ Highly reliable and safe (government-regulated) operation
・ Easy, secure connectivity
・ Low-power operation (i.e. long battery life)
・ Support for a wide range of voltages (especially lower voltages)
・ High measurement accuracy
・ Small form factors
・ Affordable cost

 

1. I2C GPIO Expander: PCF8574/74A, PCA8574/74A, PCA9674/74A
・ Why used?
   –Easily adds higher voltage I/O via I2C-bus
   –Additional inputs for keypad and signal monitoring
   –Additional outputs for LED control and sensors.
・ Where used?
   –Combats “Feature Creep” by expanding I/O port instead of new μC
   –Allows seamless migration to newer μC and still keeps the same peripherals
   –Eliminates costly congested PCB since a trace or wire is not needed for each signal
・ Why NXP GPIO expanders?
   –Largest selection of 4, 8, 16 and 40-bit GPIO in Quasi-bidirectional and Push-pull outputs with Interrupt and/or reset in small packages’
   –Wide selection of low power/low voltage (1.8V) GPIO expander portfolio suitable for mobile applications
   –Continuous innovation with new features

 

2. Proximity Sensors and Capacitive Switches:PCF8885
・ Where used?
  •System Wakeup
  •Replace Mechanical Controls, eg. volume, up/dn, number keypad etc.
・ Why used?
  •Lowest power replacement option to mechanical switch available in market
  •Elegant and clean human interface
  •Reduce power consumption via system wakeup at proximity of user
  •Longer life with no mechanical switch failure and susceptibility of system to dust
・ Why NXP Touch/Proximity Switch?
  •World’s Lowest Power Consumption: Single channel PCF8883 ~ 3uA; 8-Channel PCF8885 ~10uA;
  •High Reliability: Designed in and field tested by major automotive and consumer electronics manufacturers.
  •Easy integration in existing system with mechanical switches with minor modifications.
・ Key pads, up to 28 key (single chip)
・ Functional keys
・ Program selections
・ Low power consumption 10uA

・ Ideal for sealed surfaces
・ Insensitive to contamination & environmental changes

 

3. Data Converter: PCF8591
・ Why Used?
  –Sampling analog values
  –Provides a link between analog and digital signals
  –Interfaces between a microcontroller and its periphery
  –4 configurable input channels for sensing and measuring, and 1 output for extending digital outputs with analog function
・ Where Used?
  –Sensors: Measuring bridges, humidity, flow, pressure, temperature, fluid levels, voltages, current, etc.
  –Controls: Analog output to drives, actuators, etc.
  –Management: Battery monitor, detectors, etc.
・ Why NXP PCF8591?
  –Pioneered I2C-bus single-chip solution to interface the analog world. 8-Bit resolution with a sampling rate of 11ks/s

 

4. System Bus Protocol Bridges: SC16IS75x/76x

 

5. UARTs: SC16C652B, SC16C85xx
・Why used?
　–Transmits and receives data transfer between processor and communication channel
　–Checks communication error and relieves processor from the task of managing communication errors
・Where used?
　–Communication channels in patient monitoring equipment
・ Why NXP UARTs?
　–Established committed long-term supplier
　–Broad portfolio in the industry
　–Number #1 supplier for Industrial UARTs

 

6. SD Card I/O Controller: SDIO101

Companies Website:
http://components-asiapac.arrow.com/en/new_product/4764/

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