DI/OT tester

[gkasprow]

Due to the ongoing transition of the Sinara ecosystem to DI/OT standard, it's time actually to evaluate DI/OT chassis performance in terms of power, thermal and signal integrity.
To automate the task, let's build a simple 4-layer board with the following features:

• 16 LM75 thermometers (or even more precise ones), routed through I2C mux if necessary, placed evenly across the board
• output of all sensors are wire-or and disable the heaters when the temperature exceeds 85 degrees (or programmed value)
• 4-layer design, compatible with AISLER process
• 16 resistive heaters (5W each), each controlled by PWM driver over I2C with common disable (OE pin) controlled by LM75 outputs
• MCX output of PE CLK (via balun)
• MCX output of 12V rail via 1:10 compensated divider
• MCX output of wideband balun measuring signal between GND and panel screws
• LED bar-graph showing 12V rail loading (up to 60W) - the same as in DIOT PSU (8 LEDs)
• 12 bit I2C ADC measuring 12V and 5V rails currents and voltages
• all LVDS looped back: 0 to 8, 1 to 9, etc
• MGT loopback
• design based on DI/OT template together with sequencer