HiRel/CanSat/Slave Power
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| + | This board powers the [[HiRel/CanSat|CanSat]] system either from a battery or from an USB connector. | ||
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| + | It additionally provides a [http://www.ftdichip.com/Products/ICs/FT232R.htm serial port over USB], 4 switches and 2 LEDs. | ||
= Power inputs = | = Power inputs = | ||
Revision as of 15:11, 11 May 2015
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This board powers the CanSat system either from a battery or from an USB connector.
| CanSat Slave Power | Schematic | Description |
|---|---|---|
 |
CanSat Slave Power v2.0 Schematic PDF | LDO 5V -> 3V3: v1: SC189XSKTRT v2: AP7361-FGE-7 |
It additionally provides a serial port over USB, 4 switches and 2 LEDs.
Power inputs
The CanSat system has 3 possible power sources:
- a micro-USB connector on the power supply board
- a battery connector on the power supply board
- a micro-USB connector on the microprocessor board
Only one of these should power the system with 5 V. Jumpers are provided in order to select the actual power source. This 5 V is distributed to all the boards on the top connector disk.
The power board generates 3.3 V from 5 V. The 3.3 V is distributed to all the boards on the bottom connector disk.
Power usage
The 5 V is used by:
- the power supply board for generating the 3.3 V
- the sensors board for the Max11300 together with the temperature and pressure sensors
The precision of the 5 V is given by the components' requirements:
- the DC/DC converter needs 2.9 V ÷ 5.5 V
- the Max11300 mixed-mode I/O interface needs 4.75 V ÷ 5.25 V
- the pressure sensor needs 4.75 V ÷ 5.25 V
- the temperature sensor needs 2.5 V ÷ 5.5 V
The 3.3 V is used by:
- the FPGA
- the XBee module
- the humidity sensor on the sensors board
