schematic-checklist.md
Schematic review checklist

General


[x] CAD ERC 100% clean. If some errors are invalid due to toolchain quirks, each exception must be inspected and signed
off as invalid.
[x] Verify pin numbers of all schematic symbols against datasheet or external interface specification document (if not yet board proven).
[ ] Schematic symbol matches chosen component package
[x] Verify pinning of all cables to other boards in the system (straight through vs mirror)


Passive components


[x] Power/voltage/tolerance ratings specified as required
[ ] Ceramic capacitors appropriately de-rated for C/V curve
[ ] Polarized components specified in schematic if using electrolytic caps etc


Power supply

System power input


[x] Fusing and/or reverse voltage protection at system power inlet
[ ] TVS at system power inlet
[ ] Check total input capacitance and add inrush limiter if needed


Decoupling


[ ] Decoupling present for all ICs
[ ] Decoupling meets/exceeds vendor recommendations if specified
[ ] Bulk decoupling present at PSU


General


[x] All power inputs fed by correct voltage
[x] Check high-power discrete semiconductors and passives to confirm they can handle expected load
[ ] Analog rails filtered/isolated from digital circuitry as needed


Errata


[x] Read errata sheets (if available) for all major devices
[x] STM32: do not use JTRST pin as an I/O


Signals

Digital


[x] Signals are correct logic level for input pin
[x] Pullups on all open-drain outputs
[x] Termination on all high-speed signals
[x] TX/RX paired correctly for UART, SPI, MGT, etc
[x] Active high/low enable signal polarity correct


Strap/init pins


[x] Pullup/pulldowns on all signals that need defined state at boot -> TODO in Software
[x] JTAG/ICSP connector provided for all programmable devices


External interface protection


[x] Power outputs (USB etc) current limited
[ ] ESD protection on data lines going off board -> flemme


Debugging / reworkability


[ ] Use 0-ohm resistors vs direct hard-wiring for strap pins when possible
[x] Provide multiple ground clips/points for scope probes
[x] Dedicated ground in close proximity to analog test points
[x] Test points on all power rails
[x] Test points on interesting signals which may need probing for bringup/debug