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Work done
Success criteria review
  • ❌ Le schema ne satisfait pas completement le cahier des charges: le supercondensateur 3.3 F / 2.7 V n a pas pu etre ajoute avec une empreinte exploitable depuis la bibliotheque.
  • ❌ Le PCB est bien fixe a 14 x 14 mm, mais les empreintes disponibles pour les pads pogo et les composants choisis depassent tres largement la surface utile, donc la contrainte mecanique n est pas realisable avec les parts actuellement disponibles.
  • ❌ La zone RF keep-out sous antenne et la reserve mecanique autour du supercondensateur n ont pas pu etre finalisees de maniere credible car il manque un module BLE compact avec antenne integree dans la bibliotheque et le supercondensateur exact.
Next steps Je suis bloque par la disponibilite des composants/empreintes de la bibliotheque pour ce format 14 x 14 mm. Si vous voulez, je peux poursuivre immediatement dans l une de ces directions: remplacer U1 par un module BLE reel plus compact si vous me fournissez un MPN ou un fichier, ou bien reconstruire ce design autour de composants/empreintes minimales compatibles 14 x 14 mm.
Choisir le module BLE
Ajouter les pogo pads
Fixer l’alimentation

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Project Specification
Scope
Ultra-compact Smart Dice BLE on a 14 x 14 mm PCB powered directly from a 3.3 F / 2.7 V supercapacitor over a usable rail range of 2.7 V down to 1.7 V.
System Architecture

Diagram


I2C INT1 VCC GND SWDIO SWCLK RESET Supercapacitor 3.3F 2.7V Direct VCC rail 2.7V to 1.7V nRF52810 BLE module BMA400 accelerometer 5 pogo pads
Key Requirements
  • PCB size fixed at 14 x 14 mm
  • Direct supply from supercapacitor without intermediate regulator
  • BLE module based on nRF52810 with integrated antenna and RF keep-out under antenna
  • Bosch BMA400 connected over I2C with interrupt wake line to the BLE module
  • 5 pogo pads for VCC, GND, SWDIO, SWCLK, and RESET
  • Mandatory passives for decoupling, reset biasing, and I2C pull-ups
  • Mechanical routing corridor around the central supercapacitor body
Initial Engineering Decisions
  • Use direct VCC rail from the supercapacitor for lowest quiescent loss
  • Place BLE module at the board edge so the antenna faces outward
  • Use one shared I2C bus with one pull-up pair for the BMA400
  • Use an interrupt-capable GPIO for motion wake-up from low-power mode
Design Summary
Status: Draft / Review / Approved
Manufacturing target: Prototype / EVT / DVT / PVT / Production
Software / firmware: repository link

Scope
Purpose
In scope
Out of scope

System context

Requirements
Functional
Electrical
Mechanical / environmental

Key constraints

Dependencies and risks
Dependencies
Key risks

Validation
Success criteria
Planned checks

Release-facing notes
Expected deliverables
Special release notes

Change notes / open questions
Changes in this revision
Open questions
  • Scope

  • System Architecture

  • Key Requirements

  • Initial Engineering Decisions

  • Design Summary

  • Scope

  • System context

  • Requirements

  • Functional

  • Electrical

  • Mechanical / environmental

  • Key constraints

  • Dependencies and risks

  • Validation

  • Release-facing notes

  • Change notes / open questions

Assets

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Smart Dice Supercap BLE

Smart Dice Supercap BLE thumbnail
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Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$3.42

Digi-Key

$3.35–$5.00

LCSC

$3.36

Mouser

$1.95

Verical

$4.24–$7.98

Controls