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3615 pi0

3D Render of the pi0tel pcb

This uHat is designed to plug on top of a pi0 or pi0-w. It's designed to plug to the DIN-5 at the back of a Minitel-2. The pi0 will be powered by the Minitel through the Buck converter on the hat. TX and RX will be level-shifted to the right level on the pi's UART.

The aim is to plug the resulting dongle into a Minitel, and get instant linux.

3615 pi0 (or shall we say, 31415 Minitel).

Reference

Notes

  • Cin and Cout
    • should both have short leads to lm2596
    • should both have low ESR (e.g. high V rating, Nichicon PL, 1.25*Vin = 10V)
    • Ripple current rating 50% of DC load (500mA in our case)
  • Cin 270uF or 330uF
  • Cout 470/25 Pana or 560/16 Nichi
  • Diode
    • current rating = 1.3*load = 800mA
    • reverse V rating = 1.25*Vinmax = 10V
  • Heat pad should at least be 0.4"²
  • L choice see page 20 of Datasheet
    • L21/L22
uH A SCHOTT SCHOTT RENCO RENCO PULSE PULSE COILCRAFT
L21 68 0.99 67144070 67144450 RL-5471-5 RL1500-68 PE-53821 PE-53821-S DO3316-683
L22 47 1.17 67144080 67144460 RL-5471-6 PE-53822 PE-53822-S DO3316-47
  • If we want low output ripple we can add post ripple filter 1uH-5uH with low DC Resistance and low ESR cap

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