GC1307

@@ -0,0 +1,44 @@+# GC1307++**Gcore** · Real-time Clocks (RTC) · SOP-8++GC1307 from Gcore, 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 | Oscillator input. Connect to a standard 32.768 kHz crystal with a 12.5 pF load capacitance (CL). May alternatively be driven by an external 32.768 kHz oscillator, in which case X2 must be left floating. |+| 2 | X2 | output | Oscillator output. Connect to the 32.768 kHz crystal opposite X1. Leave floating when X1 is driven by an external oscillator. |+| 3 | VBAT | power_in | Backup supply input for a standard 3 V lithium cell or other backup source (2.0 V to 3.5 V typical). Must be within the min/max limits for correct operation; tie to GND if backup is not used. RTC/RAM access is disabled below the power-fail trip point VPF = 1.25 x VBAT. A >48 mAh Li cell provides >10 years of backup at +25 C. |+| 4 | GND | power_in | Ground reference for all supplies and I/O. |+| 5 | SDA | bidirectional | I2C serial data input/output. Open-drain; requires an external pull-up resistor. The pull-up voltage may be as high as 5.5 V regardless of VCC. |+| 6 | SCL | input | I2C serial clock input used to synchronise data transfers on SDA. The pull-up voltage may be as high as 5.5 V regardless of VCC. Standard-mode 100 kHz only. |+| 7 | SQW/OUT | output | Square-wave / output driver. When enabled (SQWE=1) drives one of four frequencies (1 Hz, 4.096 kHz, 8.192 kHz, 32.768 kHz). Open-drain; requires an external pull-up (up to 5.5 V). Powered from VCC or VBAT. Leave floating if unused. |+| 8 | VCC | power_in | Main supply (4.5 V to 5.5 V, 5.0 V typical). Full device access when VCC is in range. When VBAT is present and VCC falls below VTP (~1.25 x VBAT), read/write is inhibited; timekeeping continues on VBAT. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Gcore |+| Package | SOP-8 |+| Category | RTC |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `GC1307`+- 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:** [Gcore datasheet](docs/gc1307-datasheet.pdf) (13 pp, sha256 `03896c33df3fb5e7`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/gc1307-datasheet.pdf)

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