GN1302

@@ -0,0 +1,44 @@+# GN1302++**GN Semic** · Real-time Clocks (RTC) · SOP-8++GN1302 from GN Semic, 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 | VCC2 | power_in | Primary supply pin in the dual-supply configuration. VCC1 is connected to the backup supply and holds time/date when the main supply fails. The GN1302 runs from whichever of VCC1/VCC2 is higher: when VCC2 > VCC1 + 0.2 V, VCC2 powers the chip; when VCC1 > VCC2, VCC1 powers the chip. Operating range 2.0 V to 5.5 V. |+| 2 | X1 | passive | Connection to one terminal of an external 32.768 kHz crystal. Internal oscillator is designed for a crystal with 6 pF load capacitance. May alternatively be driven by an external 32.768 kHz oscillator signal on X1 (X2 left floating). |+| 3 | X2 | passive | Second terminal of the external 32.768 kHz crystal. Leave floating when X1 is driven by an external oscillator. |+| 4 | GND | power_in | Power supply ground / reference for VCC1 and VCC2. |+| 5 | CE | input | Chip-enable input. Must be held high during any read or write on the 3-wire interface; going low terminates the transfer and places I/O in high-impedance. Has an internal ~40 kΩ (typ) pull-down to ground. |+| 6 | I/O | bidirectional | Bidirectional data pin of the 3-wire serial interface (push-pull output). Data is clocked in on SCLK rising edges and clocked out on SCLK falling edges. Has an internal ~40 kΩ (typ) pull-down to ground. |+| 7 | SCLK | input | Serial clock input used to synchronize data movement on the 3-wire interface. Has an internal ~40 kΩ (typ) pull-down to ground. Max clock rate 0.5 MHz at VCC=2.0 V, 2.0 MHz at VCC=5.0 V. |+| 8 | VCC1 | power_in | Backup / secondary supply pin, used with a single supply plus a battery, or with a low-power backup battery. When the internal programmable trickle charger is enabled, this pin connects to a rechargeable energy source (e.g. supercap, NiMH). UL requires care to prevent reverse charging current when using a lithium cell. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | GN Semic |+| Package | SOP-8 |+| Category | RTC |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `GN1302`+- 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:** [GN Semic datasheet](docs/gn1302-datasheet.pdf) (14 pp, sha256 `8e9ff7eea88fa85c`, 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/gn1302-datasheet.pdf)

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