MCP7940NT-I

@@ -0,0 +1,53 @@+# MCP7940NT-I++**Microchip** · Real-time Clocks (RTC) · SOIC-8++MCP7940NT-I from Microchip, 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 | X1 | input | Quartz crystal input / external oscillator input. Connects to one terminal of the 32.768 kHz tuning-fork crystal (optimized for 6-9 pF load capacitance) with its external load capacitor to VSS. Also usable as the external clock input when driving the device from an external oscillator. |+| 2 | X2 | output | Quartz crystal output. Connects to the second terminal of the 32.768 kHz crystal with its external load capacitor to VSS. Leave floating when using an external oscillator driving X1. |+| 3 | VBAT | power_in | Battery backup supply input, 1.3 V to 5.5 V. Maintains RTCC and SRAM when VCC is lost; typical timekeeping backup current is 925 nA at 3.0 V. Tie to VSS if the battery backup feature is not used. |+| 4 | VSS | power_in | Device ground (0 V) reference for VCC and VBAT rails and all logic signals. |+| 5 | SDA | bidirectional | Bidirectional I2C serial data (open-drain). Requires an external pull-up resistor to VCC (typ. 10 kΩ at 100 kHz or 2 kΩ at 400 kHz). Data may change only while SCL is low; changes while SCL is high signal Start/Stop conditions. |+| 6 | SCL | input | I2C serial clock input from the bus master, used to synchronize data transfer to/from the device. Supports clock rates up to 400 kHz. Schmitt-trigger input with 50 ns spike suppression; requires an external pull-up to VCC. |+| 7 | MFP | output | Multifunction output (open-drain). Configurable as alarm output on an alarm match, as a selectable-frequency square-wave output, or as a general-purpose output driven by the OUT bit in the CONTROL register. Requires an external pull-up resistor to VCC (typ. 10 kΩ); leave floating if unused. VOL = 0.40 V at IOL = 3.0 mA (VCC = 4.5 V). |+| 8 | VCC | power_in | Primary power supply, 1.8 V to 5.5 V. Typical timekeeping current 1.2 uA at 3.3 V; SRAM/RTCC register operating current is 300 uA (read) / 400 uA (write) at VCC = 5.5 V, SCL = 400 kHz. Power-fail switchover to VBAT occurs at VTRIP (1.3-1.7 V). |+| EP | EP | passive | Exposed thermal/mechanical pad on the underside of the TDFN package. May be connected to VSS or left floating (per the Note under Table 3-1). Connection to VSS is recommended for mechanical anchoring and improved thermal performance. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Microchip |+| Package | SOIC-8 |+| Category | RTC |+| Pins | 9 |++## Ordering variants++- `MCP7940NT-IMNY`+- `MCP7940NT-IT-I/MNY`+- `MCP7940NT-ISN`+- `MCP7940NT-IMS`+- `MCP7940NT-IST`+- `MCP7940NT-IP`++## CAD (KiCad official)++- Symbol: `MCP7940NT-I`+- 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:** [Microchip datasheet](docs/mcp7940nt-i-datasheet.pdf) (56 pp, sha256 `4aafe310fbafe313`, 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/mcp7940nt-i-datasheet.pdf)

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