MCF51EM Family Development Tool
The DEMOEM is a low cost development system supporting NXP MCF51EM256 and MCF51EM128 microcontrollers. The DEMOEM is a cost-effective development board ideal for quick MCU evaluation. It consists of a DEMOEM Base Board and a DCF51EM256 Daughter Card. P&E’s Embedded Multilink circuitry on the DEMOEM board allows the processor connected to the DEMOEM to be debugged and programmed via USB from a PC. In addition, the demo board can be powered using the USB bus.
The MCF51EM V1 ColdFire MCU family targets metering and measurement applications requiring key features such as high-precision analog-to-digital conversion, timing-critical conversion sequencing, integrated LCD control, tamper detection and a full-featured real-time clock.
Highlighting these features, the DEMOEM platform contains an on-board liquid crystal display (LCD), dedicated crystal source and battery power for the independent real-time clock (IRTC) and a signal generator sub-circuit utilizing an MC9S08QE8 MCU to synthesize sine waves for three-phase power emulation.
Note: The DEMO board’s onboard Embedded Multilink circuitry is intended to function with the onbaord processor and any daughter cards that may be included. It cannot be used to communicate with other devices.
Key Applications: Metering and Measurement applications
Features
- On-board Logic Analyzer
- On-board Virtual Serial Port
- Four (4) asymmetrically positioned 13x2 male connectors for interchangeable daughter cards
- P&E’s Embedded Multilink circuitry populated on the underside
- SCI signals connected to P&E’s Embedded Multilink through jumpers
Board:
- Mother/daughter card approach. Daughter card contains only MCU and power bypass caps:
- Connectors for MCF51EM256 100-pin LQFP (DCF51EM256)
- PCB coloring:
- Black-colored mother board
- Red-colored daughter card
- NXP Form Factor Parameters must be followed
- 50-pin (2x25-pin) connector labeled MCU_PORT (J1) to bring out some device signals
- MCU_PORT (J1) has a (2.54 pitch, dual row) through-hole Female connector: 2x25 Socket Header, Pass Thru, .1", Bottom Entry, SMT
BDM interface:
- Integrated P&E Embedded Multilink Circuitry
- MDI interface features:
- SCI signals from Embedded Multilink connected through jumper to SCI1 or SCI3 pins of EM MCU
- “Logic analyzer” inputs to timer channels of Embedded Multilink to header pins
- Embedded Multilink design populated on bottom of board
- MDI interface features:
- BDM Connector (6-pin Header) (not populated)
- Jumpers (J39 and J40) to select programming the MCU daughter card or the MC9S08QE8 on the DEMOEM
Power:
- Power LED
- Board power via the USB connection
- On board Voltage Regulator with 3.3V output to MCU
- Barrel style power connector (2.1 mm)
- AAA battery holder for 2 batteries. (Alternate board power supply).
- Power switch for all board power
- Layout for jumper from board VDD to MCU VDD pins, with layout for an optional zero ohm resistor to permanently connect these signals.
- Layout for jumper from MCU VDD to MCU VDDA and from MCU VSS to MCU VSSA pins, with populated zero ohm resistor shorting jumper pins.
- Layout for jumper from MCU VDDA to MCU VREFH and from MCU VSSA to MCU VREFL pins, with populated zero ohm resistor shorting jumper pins
- All power traces are minimum double width
- Four test points for GND
- Four test point for VDD
- Voltage input jumpers
- powered DEMO via on-board voltage regulator (3.3V)
- powered DEMO via on-board USB BDM (3.3V)
- powered DEMO via on-board battery (3.0V)
- supply 3.3V power to the MCU_PORT header if the board is powered though the on-board regulator or USB
- Noise filter in the VDD to VDDA, VSS and VSSA connection in order to improve ADC accuracy
MCU:
- Reset switch with optional LED indicator.
- IRQ Button
- Crystal circuit for 32kHz to 16MHz crystal for XOSC2 input (not populated)
- Use circuit components recommended by crystal manufacturer and MCU data sheet.
- Footprint for jumpers to disable XTAL from MCU
- 0 ohm resistors in parallel with jumper footprints to connect XTAL circuit
- Jumpers to disable all the user I/O functions from additional circuitry
LCD and UI:
- 3V LCD Glass
- Jumpers (J25) to configure front and back plane selection
- 4 Buttons
- 4 LEDs
- 4 Touch cap pads (require software developed for touch sensing with standard I/Os)
Independent RTC:
- Coin-cell (CR2032) lithium battery holder with connection to MCF51EMxx VBAT pin
- Tamper button connected to TAMPER pin
- 32.768 kHz Crystal with its circuitry connected in EXTAL1 and XTAL1 pins
- Optional crystal footprint on DCF51EM256 daughter card (not populated)
- Piezo buzzer for IRTC alarm
Analogue Signal Syntheses:
- MC9S08QE8 (20-pin SOIC) with:
- Three Potentiometers
- 6 PWM outputs with low-pass filters in order to generate 60/50 Hz signals connected to Nucleus ADC inputs via jumpers
- 6 LEDs, one for each PWM output
- 1 LED connected to a GPIO
- 3 buttons
Serial Communication:
- IR interface (Tx and Rx). Connected with SCI1. (External circuitry designed to use the internal PRACMP for Rx and considering higher current capability in the Tx pin)
- RS-232 circuitry with BD9 connector connected to SCI3 through jumpers (whole circuit not populated)
- Drive four 5V LEDs using MCF51EMxx PTE4, PTE5, PTA5, and PTA6, jumper for disabling connection
- EEPROM serial SPI1 memory for NVM data storage
- Header pins for user connector or convenient monitoring of every serial port
Specifications:
- Board Size 6.0 x 4.5
- Daughter Card Size 2.0 x 2.1
- Power Input:
- USB Cable: 5VDC, 500mA max
- DC Power Jack: 2.1/5.5mm barrel connector, 6VDC Center Positive
Ships With
- DEMOEM Base Board with a DCF51EM256 Daughter Card installed
- Getting Started DVD - Getting started with the series of microcontrollers
- USB A-to-B Cable
- Quick Start Guide
- Warranty Card