XL1307

@@ -0,0 +1,43 @@+# XL1307++**XINLUDA** · Real-time Clocks (RTC) · SOP-8++XL1307 from XINLUDA, in a SOP-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 | Connection to a standard 32.768 kHz quartz crystal (CL = 12.5 pF). X1 is the input to the internal oscillator and can alternatively be driven by an external 32.768 kHz oscillator; in that case X2 must be left floating. |+| 2 | X2 | output | Connection to the opposite terminal of the 32.768 kHz quartz crystal. X2 is the oscillator output; leave floating when an external oscillator drives X1. |+| 3 | VBAT | power_in | Backup supply input for a standard 3 V lithium cell or other energy source (recommended 2.0 V to 3.5 V). Battery must be tied directly (no series diodes). If no backup is used, VBAT must be grounded. Power-fail trip point VPF = 1.25 × VBAT nominal. |+| 4 | GND | power_in | Ground reference for the device. |+| 5 | SDA | bidirectional | I2C serial data input/output. Open-drain output requiring an external pull-up resistor; pull-up voltage may be up to 5.5 V regardless of VCC. |+| 6 | SCL | input | I2C serial clock input used to synchronize data movement on the serial interface. Requires an external pull-up; pull-up voltage may be up to 5.5 V regardless of VCC. fSCL up to 100 kHz. |+| 7 | SQW/OUT | output | Square-wave/output driver. When SQWE = 1, outputs one of four selectable frequencies (1 Hz, 4 kHz, 8 kHz, 32 kHz). Open-drain; requires external pull-up (up to 5.5 V). Operates from either VCC or VBAT. May be left floating if unused. |+| 8 | VCC | power_in | Primary power supply, 4.5 V to 5.5 V (5.0 V nominal). When VCC > 1.25 × VBAT the device is fully accessible; below this threshold reads and writes are inhibited but timekeeping continues from VBAT. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XINLUDA |+| Package | SOP-8 |+| Category | RTC |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `XL1307`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [XINLUDA datasheet](docs/xl1307-datasheet.pdf) (15 pp, sha256 `3c124bb9d9354515`, retrieved 2026-08-17, tier: lcsc)+- **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/xl1307-datasheet.pdf)

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