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Analog Inputs
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=============
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_NB: this refers to general purpose analog inputs for things like CLT, TPS, MAP, etc. High-speed inputs like triggers and knock have their own pages at [trigger](docs/design/trigger.md) and [knock](docs/design/knock.md)_
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## What do the analog inputs support? ##
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- 16 channels
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- 0-5v input
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- No input protection, other than 1k series resistor
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## How do the analog inputs work? ##
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- 16 channels are managed by 4 MCP6004 quad op-amps.
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- 1k + 1nf RC filter input to opamp non-inverting input. This gives approximately 160khz of bandwidth. If a lower knee is desired, additional circuitry can be added (series resistor, or another RC, etc) to the vehicle adapter.
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- Dual 1.5k resistor divider on the output, scaling 0-5v input to 0-2.5v output. The input impedance of the STM32's ADC is on the order of 6k, so the exact value chosen does not appreciably alter the response of the system.
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## What do the analog inputs NOT do? ##
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- Input protection: this is highly pin specific, and may not be wanted if the signal is coming from the vehicle adapter board. Appropriate larger series resistor and TVS diodes recommended.
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Knock Sensor Inputs
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===================
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Outputs (injector, low side, and push-pull)
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===========================================
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Power Supplies
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==============
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Trigger (Hall & VR) Inputs
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==========================
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