PROMPT - Project for Recording, Observing, and Measuring Parachute Tube

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PROMPT is primarily intended to operate off of the regulated 5v provided from the backplane through the sensor board's connection. To allow for PROMPT to be utilized independently, the power system should be rated to allow for the direct connection of a 2S 1S LiPo battery. This will include all the requisite battery protection circuits, such as reverse-polarity protection and over-current protection. Current consumption is expected to be <100mA, closer to 30-50mA. This A jellybean priority mux circuit will be achieved using a switching regulator, to provide maximum efficiency. The voltage will be bucked directly from VIN (either the 5v or maximum 8.4v from a 2S LiPo) to 3.3v. implemented to force a selection between the 5v and battery connections. The output of this mux will then go through a boost converter to regulate it to a clean 5 volts.

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Human Interface

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Component Selection:

0-60PSI pressure: ABP2LANT060PG2A3XX

• Used by Sparkfun
• i2C interface
• Not on JLCPCB

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Thermocouple Amplifier: MAX31855 

• Used by Adafruit
• 3-Wire SPI interface
• Cannot be used with grounded thermocouples
• JLCPCB: C52028

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Memory: W25Q128JVSIQ

• Same as most other devices on the backplane
• JLCPCB: C97521

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Boost Converter: TPS61023

• Widely used by Adafruit and similar
• Input range from 0.5 to 5.5v
• Output adjustable from 2.2 to 5.5v
• 3.7A max current
• Pass-through mode when VIN > VOUT
• JLCPCB: C919459

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