JSM1302Z

@@ -0,0 +1,49 @@+# JSM1302Z++**JSMSEMI** · Real-time Clocks (RTC) · SOP-8++JSM1302Z from JSMSEMI, 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 power supply input (main Vcc). Recommended operating voltage 2.0 V to 5.5 V. When VCC2 exceeds VCC1 + 0.2 V, the device is powered from VCC2 and can source trickle-charge current to VCC1. |+| 2 | X1 | passive | 32.768 kHz crystal oscillator connection. Connect a 32.768 kHz crystal between X1 and X2; the crystal's specified load capacitance (CL) should be 6 pF. |+| 3 | X2 | passive | 32.768 kHz crystal oscillator connection. Connect a 32.768 kHz crystal between X1 and X2; the crystal's specified load capacitance (CL) should be 6 pF. |+| 4 | GND | power_in | Ground reference (0 V) for the device. |+| 5 | RST | input | Active-low reset / chip-enable input (labeled with overline on datasheet). Must be driven high to initiate any data transfer and held high for the entire transaction; a low level aborts the transfer and forces the I/O pin to high-impedance. TTL-compatible (VIH ≥ 2.0 V, VIL ≤ +0.8 V at VCC=5 V). |+| 6 | I/O | bidirectional | Serial data input/output pin of the 3-wire interface. Data is clocked in on the rising edge of SCLK and clocked out on the falling edge. Pin goes to high-impedance when RST is low. I/O capacitance is 15 pF typical; leakage up to 500 µA. |+| 7 | SCLK | input | Serial clock input for the 3-wire interface, driven by the host microcontroller. Synchronizes data transfers on the I/O pin. Maximum clock frequency 0.5 MHz at VCC=2.5 V and 2.0 MHz at VCC=5 V (DC minimum). |+| 8 | VCC1 | power_in | Backup power supply input (typically a battery or supercapacitor for timekeeping retention). Also acts as the output of the internal programmable trickle charger sourced from VCC2. When VCC2 + 0.2 V < VCC1, the device is powered from VCC1. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | JSMSEMI |+| Package | SOP-8 |+| Category | RTC |+| Pins | 8 |++## Ordering variants++- `JSM1302ZZ/TR`+- `JSM1302ZN`++## CAD (KiCad official)++- Symbol: `JSM1302Z`+- 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:** [JSMSEMI datasheet](docs/jsm1302z-datasheet.pdf) (13 pp, sha256 `6953abaf7cde3cb8`, 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/jsm1302z-datasheet.pdf)

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