Testing
First, we tested the chip without the PCB on a breadboard. We used a power source, a frequency generator and probed the output pins to an oscilloscope. A complete testing report can be found here. Below we illustrate some main function outputs.
Fig. 35: Breadboard test
Fig. 36: 1Hz frequency & Enable Signals
Fig. 37: Global Reset & Cross Enable verification
After verifying the chip's operation, we started testing it with the PCB.
- Power Circuitry Test
Fig. 38: Power Circuitry Test
- Led Display Test
- External Frequency Generator Test
- Oscillator Test
Fig. 39: Oscillator Output Frequency Test
Fig. 40: Testing of PCB with chip mounted