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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
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== Summary ==<br />
Technical overview of the Waveshare DS1302 real-time clock (RTC) unit: a timekeeping module with an SPI interface that is clocked by an external oscillator. The page provides schematic, code and datasheet resources, plus notes on typical timing drift and an example connection to an STM32 microcontroller.<br />
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== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/9709 9709 – DS1302 RTC Board]<br />
* [https://shop.jw-tech.eu/p/WSAL9709 WSAL9709 – DS1302 RTC Board]<br />
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== Technical overview ==<br />
* The DS1302 unit is a real-time clock (RTC) module in the Modules category from Waveshare.<br />
* It exposes an SPI interface for connecting to microcontrollers.<br />
* The module takes the divided clock from the external oscillator as its timekeeping signal.<br />
* The external oscillator's frequency varies with ambient temperature, which can cause clock error over time.<br />
* The wiki page lists resources: schematic, code, datasheets, and software.<br />
* A FAQ entry explains that accuracy may degrade after prolonged use because the oscillator frequency is temperature-dependent.<br />
* The default SPI test demo illustrates an example wiring for STM32.<br />
* Example pin mapping from the demo: PA4 = CS, PA5 = SCK, PA6 = MOSI, PA7 = MISO.<br />
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== Notes and version constraints ==<br />
* The given pin mapping comes from an example demo; it is version-sensitive and must be verified against the specific controller before use.<br />
* The described clock error arises from temperature-induced frequency variation of the external oscillator; no compensation or calibration steps are provided in the source.<br />
* No exact electrical values, commands, prices, stock levels, certifications, warranty or safety information appear in the source; none were added.<br />
* The source contains template placeholders (e.g., &#123;&#123;&#123;name2&#125;&#125;&#125;, &#123;&#123;&#123;userDefinedInfo&#125;&#125;) that provide no usable facts; these were omitted.<br />
* Human confirmation recommended: whether the demo pins match the target STM32 board and how the temperature dependence should be handled in practice.<br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/DS1302_RTC_Board DS1302 RTC Board - Waveshare Wiki]<br />
* Source revision: 75980<br />
* Captured: 2026-08-29T09:53:26+00:00<br />
* SHA-256: <code>436f7ed13648d1b9588a9e67f91f3c9aca01e684f7d79eaaf662ee5de3c10d41</code></div>JWTechPublisher