DRM101 Datasheet, PDF (23/56 Pages) Freescale Semiconductor, Inc – Blood Pressure Monitor Using the Flexis QE128 Family

Chapter 3
Hardware Description
3.1 Introduction
The design for the BPM PCB was made with the intention of isolating the different blocks of the system
to avoid letting coupling noise into the lines of the instrumentation amplifier. The power is segmented
through the use of 0 Ω resistors for debugging. These resistors can be replaced by ferrite cores to suppress
EMI and noise coming from the different portions of the board. Ground distribution was implemented
using a star configuration.
Another feature of the board is the test socket which eases the change between the S08 and the ColdFire
device.
This section provides the technical descriptions for the Freescale BPM system, and for the Freescale
components used in the reference design. These Freescale components are:
• Flexis MC9S08QE128 Microcontroller
• Flexis MCF51QE128 Microcontroller
• MPR083 Proximity Sensor
• MR2A16A Asynchronous Magnetoresistive RAM
• MC9S08JM60 Microcontroller
• MC13202 ZigBee Transceiver
• MPXV5050 Pressure Sensor
• OSRAM Pictiva OLED Display OS128064PK27MY0B00
3.2 Operating Environment
• Input voltage: 9 VDC
• Input current: 800 mA minimum, 1 A maximum
• Operating temperature: 0 to +65 °C
• Operating humidity: 90% RH maximum for T_A 40 °C
3.3 Flexis MC9S08QE128 and MCF51QE128 Microcontrollers
The Flexis QE128 microcontrollers are Freescale’s revolutionary 8-bit and 32-bit compatible devices.
They offer unprecedented compatibility, and have a common set of on-chip peripherals and development
tools. They maintain pin-to-pin compatibility, which enables a developer to create one common hardware
platform and use that platform for more than one product with different computing capabilities.
Blood Pressure Monitor Design Reference Manual, Rev. 0
Freescale Semiconductor
3-1