M41T81M6F

@@ -0,0 +1,47 @@+# M41T81M6F++**STMicroelectronics** · Real-time Clocks (RTC) · SOIC-8++M41T81M6F from STMicroelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | XI | input | Oscillator input. Connects to one terminal of the external 32.768 kHz crystal. Internal load capacitance (12.5 pF) is integrated on-chip. |+| 2 | XO | output | Oscillator output. Connects to the other terminal of the external 32.768 kHz crystal. |+| 3 | VBAT | power_in | Battery supply voltage. Connects to a small lithium button cell to sustain SRAM and clock operation when VCC falls below the switchover trip point. |+| 4 | VSS | power_in | Ground reference (0 V). |+| 5 | SDA | bidirectional | I2C serial data input/output (open-drain). Requires an external pull-up resistor to a positive supply. Supports 400 kHz Fast-mode I2C. |+| 6 | SCL | input | I2C serial clock input. Requires an external pull-up resistor to a positive supply. Supports 400 kHz Fast-mode I2C. |+| 7 | IRQ/FT/OUT/SQW | output | Multi-function open-drain output. Software-selectable between alarm interrupt (IRQ, active low), frequency test (FT), general output driver (OUT), or programmable square-wave (SQW). Square-wave function has the highest priority. Requires external pull-up. |+| 8 | VCC | power_in | Main supply voltage, 2.0 V to 5.5 V. When VCC falls below the VSO trip point (VBAT - 0.5 V typ), the device automatically switches to VBAT. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | SOIC-8 |+| Category | RTC |+| Pins | 8 |++## Ordering variants++- `M41T81M6F`++## CAD (KiCad official)++- Symbol: `M41T81M6F`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/m41t81m6f.pdf) (29 pp, sha256 `cd94dc7a56064d62`, 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/m41t81m6f-datasheet.pdf)

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