Quote:
Originally Posted by adciv
If I remember right, the 5v rail is disabled during brown out. Can't remember if the 3.3v rail is or not.
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That depends on the level of brownout.
At 6.8V the 6V PWM rail is disabled, CAN devices are sent a disable command.
At 6.3V the 5V rail is disabled among DIO, Analog and MXP. 3V3 is disabled on the SPI and I2C bus. Something to note is that the 5V output on the SPI bus appears to stay active. If the internal jumper J2 is configured properly, all DIO outputs turn to 3V3 and are also disabled at this brownout level.
Keep note that all power going to the USB bus is still active.
Source:
https://wpilib.screenstepslive.com/s...g-current-draw