Checkpoint LAB USB-RS232 Uživatelský manuál stáhnout pdf (Strana 2)

Typical Example list:

 Microcontroller, Software,

OS needs.

 Data sample rate?

Frequency response?

 Integrate / discrete

components / hybrid

Warning: Don’t stop at

the board’s edge!

Remove the magic of Black

Boxes

Why? Neither you, your team

nor faculty can help with a

series of black boxes.

Step 1. Schematic Bullet List Plan

 Circuit Board?

• test points –LEDs, JTag,

USB, RS232, (may not need

the form factor)

 accessory power connectors

 Power On switch(s), reset and

safety switches, function

select switch

STEP 2: INPUT OUTPUT DEVICE ADVICE

a: Interface Specifications

 Bandwidth, frequency response; rf to dc

 Data rate, Sample rate

 Protocol: RS232, I2C, CAN, Bluetooth, Zigbee, ….

 Analog versus digital (you should know by now)

• Need vs. Available: Resolution 8, 12, 16 bit

 Circuit protection

 Power/ Current

 Voltage Levels: Vdd/Vcc, multiple? Level shifting needed?

 Devices (Vdd vary from 1.5 VDC to 18 VDC)

 Microprocessor I/O - GPIO output: Sink or source?

 Microprocessor I/O - Analog; ADC, DAC

 Data Controls: enables, select lines, etc.

 EMI Noise

 Heat

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Checkpoint LAB USB-RS232 Uživatelský manuál Strana 2