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Magnus HedemarkandGitHub
6db11ea58a
* feat(electronics): add design and bench methodology * fix(electronics): retain compact diagnostic evidence * test(electronics): accept equivalent loading diagnostics
58 lines
1.9 KiB
Markdown
58 lines
1.9 KiB
Markdown
# Component contract
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## 1. Job and envelope
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- Function and observable behavior:
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- Component family and why:
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- Input/output quantities and units:
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- Minimum / nominal / maximum / transient / fault:
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- Supply rails, frequency, duty cycle, ambient, enclosure, lifetime:
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- Acceptance criteria:
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## 2. Identity and evidence
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- Manufacturer and exact ordering code/package/revision:
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- Datasheet and application-note URLs:
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- Schematic, pinout, exposed pad, polarity, assembly constraints:
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- Guaranteed values versus typical curves:
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- Board/SoC schematic and firmware assumptions, if attached:
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- Unknowns and evidence owner:
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## 3. Margins and calculations
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| Requirement | Equation/assumption | Corner | Result | Margin | Evidence |
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|---|---|---|---|---|---|
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- Tolerance, drift, noise, leakage, loading:
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- Dissipation, thermal path, SOA/transient:
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- Protection energy and clamp limits:
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- Guaranteed / estimated / measured classification:
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- Controlling corner and model-validity range:
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- Observed fact:
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- Inference supported by the fact:
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### Completed example
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| Requirement | Equation/assumption | Corner | Result | Margin | Evidence |
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|---|---|---|---|---|---|
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| actuator conduction | `P=I²R`, hot guaranteed `RDS(on)` | 0.42 A steady, hot | 32 mW | below thermal budget | datasheet condition + measured rail |
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The example is screening evidence only; startup linear-mode SOA and clamp
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waveforms remain separate requirements.
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## 4. Interface and failure contract
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- Logic thresholds, impedance, timing, power-up/down:
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- Driver, pull resistor, clamp, flyback, snubber, fuse/current limit:
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- Ground/isolation, creepage/clearance:
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- Open, short, reversed, disconnected, brownout behavior:
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## 5. Verification
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- Instruments, fixtures, raw-data location:
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- Normal, corner, reset/power-cycle, and fault tests:
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- Temperature/supply/load corners:
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- Calibration and diagnostic checks:
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- Pass/fail evidence and unresolved risks:
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