Specifications
This is a simple low cost frequency counter that can be used for frequency measurement or as frequency scale for various devices.
Supply Voltage: 3,3V
Maximum frequency: 16MHz (min. 20ns impulse width)
Display: 8 digit 7 Segment LED (Common Chatode Green)
Input level: 3.3V
CMOS Logic Time Base: 16 MHz DCO
Measurement
Time Base: 4.194304 MHz XTAL (Calibrated)
Connectors
Connectors
J1 – JTAG Programing connector (Texas Instrumments MSP430 Spy-By-Wire programming)
J2 – Signal Input (CMOS 3.3V Logic)
J3 – Power (Single 3.3V)
J4 – Calibration connector (Not used during normal operation. It can be used to connect few pF
capacitance or trimmer cap during calibration to achive the precise XTAL frequency)
J5 – Clock connector. The INT CLOCK and the CLOCK INPUT pins must be shorted with a jumper
during normal operation when internal clock source is used. If external clock source used it must be
connected to the CLOCK INPUT and the GND pins.
Code files
End result
Project properties
- Cheap: The component total should be below $5
- Using TI's MSP430 line of MCUs what I'm learning now
- Able to measure till 10MHz
- Using LED display
- Able to calibrate - achieve maximum +-10Hz error at 10MHz
Schematics
Comments