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Design

Design notes, simulations, and captured results while bringing up the Splinter hardware.

Contents

  • SimpleBoost_V4_simple.asc / SimpleBoost_V5_opamp.asc - LTspice simulations for the boost converter and op-amp control loop.
  • booster.xlsx - sizing / calculator spreadsheet for the booster.
  • screenshots/ - captured results from bring-up experiments (Firmware/src_pgmtest/ and Firmware/src_boostertest/).

Bring-up / Verification

This section collects notes and captures from bring-up experiments across the firmware test applications. For implementation details, see Firmware/src_boostertest/README.md and Firmware/src_pgmtest/README.md.

Booster electrical characterization (Firmware/src_boostertest)

Booster ripple

Booster frequency was set so Vboost ~15V, 1 kohm load. Scope settings: 1 us/div (horizontal) and 50 mV/div (vertical). Measured ripple: 64 mV Vpp. The ripple remained similar across load conditions.

Booster ripple

Booster voltage vs duty cycle and load

Booster V vs duty and load

Booster current vs duty cycle and load

Booster I vs duty and load

VPP vs PWM_VPP and VBOOST

VPP vs PWM_VPP and VBOOST

PDK programming (Firmware/src_pgmtest)

Notes:

  • Target pin mapping: PC5=ICPCK, PC6=MOSI (3-wire only), PC7=ICPDA/MISO (2-wire data or 3-wire MISO).
  • Power sequencing: VDD/VPP are derived from BOOST; keep VDD/VPP at 0V while enabling BOOST, then cycle VDD/VPP per programming step.
  • IO level note: without level shifting, we keep target VDD close to ~5V during bring-up for reliable GPIO logic levels.

PFS154 read

PFS154 read

PMS150C read

PMS150C read

PFS154 erase + write + read

PFS154 erase/write/read

16 words were written starting at address 0x0100 (test pattern 0x0000..x000f).