Phase 1 project setup and mechanical constraints
Load the "Raspberry Pi Zero Shield Template". Adjust the board outline to 68mm x 45mm to fit the 4th Generation iPod chassis. Set the maximum Z-axis height constraint to 19mm. Configure a 4-layer standard stackup. Define a 0.2mm keepout zone. Delete any standard 40-pin female through-hole headers from the template, as the Pi Zero 2 W will be flush-mounted without headers.
Phase 2 primary power and star ground topology
Add the Adafruit BQ25185 USB/DC/Solar Charger with 5V Boost (Product ID: 6106). Connect the BAT pad to a JST-PH 2.0 connector for a 3.7V LiPo battery. Connect the 5V pad to a new net named +5V_DIRTY. Designate the GND pad of the BQ25185 explicitly as STAR_GND. Route the +5V_DIRTY net through an in-line physical master power switch.
You want the Raspberry Pi Zero Shield Template updated for your iPod-chassis mechanical envelope, then a BQ25185-based charger/boost power front-end with a STAR_GND and a switched +5V_DIRTY rail.
Phase 1: set board outline to 68 mm x 45 mm, apply Standard 4 Layer stackup, enforce 0.2 mm keepout/clearance, and encode a 19 mm max height constraint; audit and remove any 40-pin female TH headers if present.
Phase 2: add the Adafruit BQ25185 USB/DC/Solar Charger w/ 5V boost (PID 6106), add a JST-PH 2.0 LiPo connector to BAT, name the boost output net +5V_DIRTY, name charger ground STAR_GND, and insert an in-line master switch in series with +5V_DIRTY.
The plan is ready to execute — click Start on the plan bar to run it.
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
General Purpose Thick Film Standard Power
and High-Power Chip Resistor
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film
Features:
- RMCF – standard power ratings
- RMCP – high power ratings
- Nickel barrier terminations standard
- Power derating from 100% at 70ºC to zero at +155ºC
- RoHS compliant, REACH compliant, and halogen free
- AEC-Q200 compliant