Micro PC PCB Design Options

flux

Work done
  • Cleaned up floating interfaces on J3, U13, and U14 by marking the unused legacy and reserved pins as intentional no-connects while preserving the active named rails.
  • Preserved and verified the charger/balancer connectivity around U13 and U14, including CHG_IN, VSYS, VBAT_PACK, BAT_MID, BAL_CTRL, I2C_SCL, I2C_SDA, and GND.
  • Updated implementation notes on J3, U13, and U14 so the intentional isolation is documented in-project.
  • Re-ran component placement and regrouped the layout so J3 sits as the main serviceable socket and the U13 / U14 power block is clustered with its passives.
Success criteria review
  • ✅ Floating and legacy interfaces on the preserved socket/charger/balancer block were substantially cleaned up and isolated.
  • ✅ The charger/balancer subsystem and named rails were preserved.
  • ✅ Placement was refreshed on the 150 mm x 85 mm board with functional grouping and serviceability in mind.
  • ❌ I could not finish with clean ERC/DRC. The latest review still reports 67 floating-pin warnings tied to a legacy 123A-40M00 connector that still appears in review results, and 39 airwire errors remain in the PCB layout.
Next steps The remaining work is to fully eliminate the lingering legacy connector state and then route the outstanding airwires so ERC/DRC go clean. I could not complete those last steps in this session.
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Handheld Socketed Module Console thumbnail
Handheld computing carrier board for a salvaged CPU module using a 100-pin mezzanine socket, with preserved 2S battery charging, balancing, and service-friendly edge I/O.

Properties

Pricing & Availability

Distributor

Qty 1

Digi-Key

$4.15

LCSC

$6.46

Mouser

$0.00

TME

$1.26

Verical

$0.98–$1.50

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