µHoubolt Power Management Unit (PMU) Hardware

Features

• Altimeter capability (barometer, IMU, 2x Low Side Fet)
• 2x Low Side Fet for camera
• 1x Optocoupler for payload enable
• 2x LiIon Charger
• Flash for data logging
• 2x CAN FD

Known Issues

• CAN Rx and Tx are swapped on CAN1 and CAN2
• No Battery Voltage Sense
• No Pyro Voltage Sense
• Same Connector for 12V and 24V
• No direct hardware arming for primary altimax
• Supply Current Sense is connected to the wrong pin
• Layout: Battery connector is hard to disconnect because it's next to the mounting hole (threaded rod)
• When powering cameras from pyro voltage, their initial current draw is large enough to trigger the overcurrent protection --> all supplied devices might get power cycled when safety pin is pulled (especially bad for ECU, might cause igniters to fire, see ECU known issues)