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License: Other
febex backplane power control/delay board
License: Other
FEBEX power delay/control firmware == Introduction == Using an arduino nano to control a FETT which can turna 12V supply voltage for a FEBEX 3 crate on/off. GSI FEBEX crates feature a DC-DC converter which provides 12V DC at up to some 20 amps. However, due to a suboptimal design choice for our FEBEX Addon Board (FAB), the secondary DC-DCs on the FAB draw much current during startup, keeping the primary DC-DC at circa 3V. Rather than throwing away all of our FABs, we decided to add a PCB between the primary DC-DC board and the crate backplane. This new board: * Charges a big cap (~ 10mF) over a resistor (22R). The cap can be discharged over a diode, providing the current boost needed for turning our secondary DC-DCs on. * Features an arduino nano as a (kinda) component * Contains a big FET (Vishay - SI7157DP) which can turn the 12V lane between primary DC-DC and backplane on/off * Measures the input, output and cap voltage with the build-in ADC. * Measures the current using a shunt-resistor and a MAX9611 high- side current sensing IC (just becase we can). When turned on, the firmware waits for the cap to be reasonable full. As soon as that happens, it turns on the FET, providing the voltage to the backplane. When the input voltage falls below a much lower threshold, we assume that we have lost power and turn the FET off again. Additionally, a serial connection is provided. Over it, a user can get read the various measurements as well as power toggle the backplane. == Using == For use with the ino tool (http://inotool.org/) Use make to compile, ino upload to flash the atmega, and screen /dev/ttyWhatEver 115200 to connect to the serial interface. == Remarks on design choice == We decided on using a Nano instead of placing a uC directly on the board because we only needed a few boards, and using off-the-shelf components when you can simplifies matters.
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