MCP9808 Precision Temp Sensor

@@ -0,0 +1,54 @@+# MCP9808++**Microchip** · Temperature Sensor · MSOP-8++The MCP9808 is a digital temperature sensor with typical +-0.5 C accuracy over -20 C to 100 C, reporting over I2C. It has user-programmable temperature limits and an open-drain alert output that trips on over/under-temperature or a critical threshold, and three address pins let up to eight share a bus. It suits thermal management and monitoring.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | SDA | bidirectional | I2C/SMBus serial data. Open-drain bidirectional line; requires an external pull-up resistor. VIH ≥ 0.7·VDD, VIL ≤ 0.3·VDD; VOL ≤ 0.4 V at IOL = 3 mA. Supports 0-400 kHz clock. |+| 2 | SCL | input | I2C/SMBus serial clock input. Requires an external pull-up resistor. VIH ≥ 0.7·VDD, VIL ≤ 0.3·VDD; input current ±5 µA max. 0-400 kHz. |+| 3 | Alert | output | Temperature Alert output. Open-drain output requiring an external pull-up resistor. Programmable polarity (active-low or active-high) and operating mode (comparator/thermostat or interrupt). VOL ≤ 0.4 V at IOL = 3 mA; leakage IOH = 1 µA typ. |+| 4 | GND | power_in | Ground reference for the device. Connect to the system ground plane. |+| 5 | A2 | input | I2C slave address select bit 2. Tie to VDD or GND to set one of eight selectable slave addresses (0011 A2 A1 A0). Logic level latched at power-up. |+| 6 | A1 | input | I2C slave address select bit 1. Tie to VDD or GND to set part of the 3-bit user address. |+| 7 | A0 | input | I2C slave address select bit 0. Tie to VDD or GND to set part of the 3-bit user address. |+| 8 | VDD | power_in | Positive supply input, 2.7 V to 5.5 V. Bypass with a 0.1 µF ceramic capacitor placed close to the pin. IDD = 200 µA typ (400 µA max); ISHDN = 0.1 µA typ. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Digital I2C temperature sensor |+| Accuracy | +-0.25 C typ, +-0.5 C max (-20 to 100 C) |+| Resolution | 0.0625 C (up to 12-bit) |+| Interface | I2C / SMBus |+| Alert | Programmable open-drain (over/under/critical) |+| Addresses | 3 address pins (up to 8 on a bus) |+| Supply voltage | 2.7 V to 5.5 V |+| Operating temperature | -40 C to 125 C |++## Ordering variants++- `MCP9808MS`+- `MCP9808T-MS`+- `MCP9808MC`+- `MCP9808T-MC`++## CAD (KiCad official)++- Symbol: `mcp9808.kicad_sym`+- Footprint: `mcp9808.kicad_mod`+- 3D model: MSOP-8 body from KiCad `Package_SO/MSOP-8_3x3mm_P0.65mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Microchip datasheet](https://ww1.microchip.com/downloads/en/DeviceDoc/MCP9808-0.5C-Maximum-Accuracy-Digital-Temperature-Sensor-Data-Sheet-DS20005095B.pdf) (53 pp, sha256 `e7b6502f744c3e60`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/mcp9808-datasheet.pdf)

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