DS1302DTR

@@ -0,0 +1,48 @@+# DS1302DTR++**XBLW DS1302DTR XBLW** · Real-time Clocks (RTC) · SOP-8++DS1302DTR from XBLW DS1302DTR XBLW, 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 pin in dual-supply configuration (2.0V-5.5V). DS1302 draws from the larger of VCC1 or VCC2: when VCC2 > VCC1 + 0.2V, VCC2 powers the device; otherwise VCC1 does. |+| 2 | X1 | passive | Connection for a standard 32.768 kHz quartz crystal (specified load capacitance 6 pF). May alternatively be driven by an external 32.768 kHz oscillator signal (with X2 left floating). |+| 3 | X2 | passive | Second connection for the 32.768 kHz quartz crystal. Leave floating if X1 is driven by an external oscillator. |+| 4 | GND | power_in | Device ground reference (0V). |+| 5 | CE | input | Chip-enable input; must be driven high during a read or write to enable the shift-register access. Has an internal 40 kΩ (typ) pulldown to ground. Previously called RST in older revisions (functionality unchanged). |+| 6 | I/O | bidirectional | Bidirectional data pin (push-pull output) for the 3-wire serial interface. Has an internal 40 kΩ (typ) pulldown to ground; tri-states when CE is low or on each SCLK rising edge during reads. |+| 7 | SCLK | input | Serial-clock input used to synchronize data movement on the 3-wire interface (DC to 2.0 MHz at VCC=5V, DC to 0.5 MHz at VCC=2V). Has an internal 40 kΩ (typ) pulldown to ground. |+| 8 | VCC1 | power_in | Low-power/battery-backup supply pin. In systems using the trickle charger, the rechargeable energy source (e.g. UL-recognized lithium coin cell) is connected here; internal circuitry prevents reverse charging current. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XBLW DS1302DTR XBLW |+| Package | SOP-8 |+| Category | RTC |+| Pins | 8 |++## Ordering variants++- `DS1302DTR`+- `DS1302DTRN`++## CAD (KiCad official)++- Symbol: `DS1302DTR`+- 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:** [XBLW DS1302DTR XBLW datasheet](docs/ds1302dtr-datasheet.pdf) (16 pp, sha256 `4dffa2998571d25e`, 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/ds1302dtr-datasheet.pdf)

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