Power Controller Module v1

Version Details
v1 Original design
v1.5 Simplified power controller for time efficiency

This module will be a simple power regulator for the rest of the balloon modules. It will regulate the power from a common voltage battery pack out to several required voltages.

Team Members

  • Dan Bowen




A large stack of parallel lithium AA Energizer Ultimate Lithium battery packs will supply raw voltage of 3 to 4v. There will be several stacks in parallel to provide for long duration operation.


Power output should be:

12v 2A
5v 1A
3.3v 1A


Main Bus

This will connect to the main White Star Bus, providing power to all other modules connected to said bus. Please see the hardware specs for the White Star Bus 7-Pin connector. The connector must implement power as well as I2C communications.

The Temp sensor that extends into the battery pack should be logically on the main I2C bus, but the power controller microcontroller needs to identify it in device scans.

Battery Pack

The single battery pack will need to connect to the power controller with a connector of some sort mounted on the controller PCB.

Pin Purpose
2 Batt V+
3 Heater Vcc
4 Pack Temp Sensor ?
5 Pack Temp Sensor ?


  • Maxim DS2741 Current monitor and used current accumulator.
    • On PCB
  • TI TMP101 - This tiny SMD temp sensor is also a settable thermostat that could control the heater automatically.

Power Regulation

3.3v @ ~1A

5v @~1A

12v @ ~2A


This module will need to dump heat from the voltage regulators into the actual battery pack. Arrange the regulators on the board so that they are in contact with, or within 5mm of, the battery pack. This module will be the only electronics inside the insulated battery pack chamber, for the purpose of utilizing waste heat from the regulators to heat the batteries.


Possible parts

Texas Instruments TMP512

TI TMP512 - This chip looks like it would kill two birds with one stone!

  • I2C Temperature sensor chip
  • On-chip temp
  • 2 remote temp sensing inputs
  • Current/Power/Voltage measurement

Texas Instruments TMP101

TI TMP101 - This tiny SMD temp sensor is also a settable thermostat that could control the heater automatically.

  • I2C Thermostat chip

Maxim max4172

max4172 Current monitor and used current accumulator. This chip will tell us how much current has been used in mAh! However, it only works from 3.3v to 5v. No 12v.

  • I2C
  • Onboard temp sensor
  • Current used accumulator

MAxim DS2741

DS2741 Current monitor and used current accumulator. No 12v

Maxim DS2745

DS2745 Current monitor, accumulator, voltage sensor, temp sensor




  • NCP3163 Boost converter, looks good, few external parts, 3A
hardware/power/v1.txt · Last modified: 2018/07/29 17:58 (external edit)
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