GM1302

@@ -0,0 +1,43 @@+# GM1302++**GATEMODE** · Real-time Clocks (RTC) · SOIC-8++GM1302 from GATEMODE, 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 | Vcc2 | power_in | Primary supply pin in a dual-supply system. GM1302 is powered by whichever of Vcc1/Vcc2 is higher: when Vcc2 > Vcc1 + 0.2V, GM1302 draws from Vcc2; when Vcc2 + 0.2V < Vcc1, it draws from Vcc1. Recommended operating range 2.0-5.5V. |+| 2 | X1 | input | Oscillator input; connect an external 32.768 kHz crystal between X1 and X2 (specified crystal load capacitance CL = 6pF). Internal oscillator capacitance is integrated. |+| 3 | X2 | output | Oscillator output; connect to the external 32.768 kHz crystal along with X1. |+| 4 | GND | power_in | Ground reference for the device. All voltages are referenced to GND. |+| 5 | RST | input | Reset / chip-enable input. Must be driven HIGH during any read/write to initiate a data transfer; driving it low terminates a transfer and places I/O in high-impedance. Contains an internal 40kΩ (typ) pull-down to ground. On power-up RST must be held logic 0 until Vcc ≥ 2.5V. |+| 6 | I/O | bidirectional | Bidirectional serial data pin for the 3-wire interface (command/address in, data in/out). Contains an internal 40kΩ (typ) pull-down to ground. Goes high-impedance when RST is low or between output bits per SCLK rising edge. I/O capacitance C_I/O typ. 15 pF. |+| 7 | SCLK | input | Serial clock input for the 3-wire interface; synchronizes data transfers on the I/O pin. Data in is latched on the rising edge, data out is driven on the falling edge. Contains an internal 40kΩ (typ) pull-down. Max SCLK frequency 2 MHz at Vcc = 5V (0.5 MHz at Vcc = 2V). |+| 8 | Vcc1 | power_in | Backup supply pin. In a single-supply-with-battery system Vcc1 provides low-power operation and low-power battery backup; it can source the device (and be trickle-charged from Vcc2 through the programmable trickle-charge network) when the main Vcc2 supply is absent. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | GATEMODE |+| Package | SOIC-8 |+| Category | RTC |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `GM1302`+- 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:** [GATEMODE datasheet](docs/gm1302-datasheet.pdf) (11 pp, sha256 `3214ee6475dc55db`, 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/gm1302-datasheet.pdf)

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