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WSAL20903 – UART Fingerprint Sensor (D)/en

Aus JW Tech Wiki

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.

Summary

A compact, round capacitive fingerprint sensor with an integrated Cortex processor and a UART interface. It supports enrolling, imaging, feature extraction, template storage and matching via simple UART commands.

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Technical overview

  • The sensor uses a high-performance Cortex processor together with a commercial fingerprint algorithm for stable and fast identification.
  • Capacitive sensing element: touching the collection area is sufficient for detection.
  • Resolution 508 DPI; image size 160 x 160 pixels at 8-bit grayscale.
  • Sensor diameter approx. R15.5 mm; the narrow stainless-steel rim enables 360° omni-directional verification.
  • Embedded human sensor: the processor automatically enters sleep mode and wakes up on touch.
  • Built-in UART connector (19200 baud) for easy connection to platforms such as STM32 or Raspberry Pi.
  • Power consumption: operating current below 50 mA, sleep current below 16 µA.
  • Operating environment: -20 °C to +70 °C, humidity 40–85 % RH (no condensation).
  • Storage environment: -40 °C to +85 °C, humidity below 85 % RH (no Condensation).

Notes and version constraints

  • The exact command list for Type D is not fully specified in the source; according to the wiki most commands match those of Type C – please check the manufacturer documentation.
  • Pinout: Do not wire by cable color because colors can vary between production lots. Verify each line against its definition before connecting.
  • The RST input controls sleep mode: High = active, Low = powered down. WAKE outputs a high signal when a touch is detected while in sleep mode.
  • Reliability of 360° verification may vary with mounting height, tilt and ambient light – please verify in the target device.

Source and revision record

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