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WSAL22059 – UART Fingerprint Sensor (E)/en

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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.

Summary

The UART Fingerprint Sensor (E) is a highly integrated capacitive fingerprint module with a Cortex processor and built-in recognition circuitry. It communicates over a serial interface (19200 baud, TTL level) and supports enrolling, feature extraction, and matching against up to 3000 stored templates.

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Technical overview

  • Capacitive sensor type with 508 DPI resolution and a 160 × 160 pixel image at 8-bit grayscale.
  • Housing/sensor area approx. 11.2 × 12.2 mm; the entire module chip integrates processor and sensor in a small form factor.
  • Operating voltage: 3.3 V; operating current < 50 mA; sleep-mode standby current < 16 µA.
  • Serial communication: UART at 19200 baud, TTL signal levels; connectors VIN, GND, RX, TX.
  • Sleep/wake-up logic: RST at low level puts the module into sleep; when the sensor is touched while sleeping, WAKE outputs a high level and wakes the unit.
  • Template storage capacity: 3000 entries; matching time under 200 ms for 1:N comparisons with N ≤ 100.
  • False acceptance rate < 0.001%; false rejection rate < 0.1%.
  • Operating environment: temperature −20 °C to 70 °C, relative humidity 40–85% RH (no condensation).
  • Storage temperature: −40 °C to 85 °C; storage relative humidity < 85% RH (no condensation).
  • ESD tolerance: contact discharge 8 kV, air discharge 15 kV.

Notes and version constraints

  • The exact command list and protocol are not provided in the supplied text; consult the official documentation or demo program to obtain the precise syntax.
  • Compatibility with specific microcontrollers (e.g., STM32, Raspberry Pi) is only mentioned generically; definitive wiring details must be verified per platform.
  • The quoted rates (false acceptance/false rejection) are manufacturer figures under lab conditions; real-world values may vary depending on environmental conditions.
  • Version-specific firmware updates or calibration steps are not described in the source; check the latest documentation before commissioning.
  • The ESD figures refer to the component itself; system-level may require higher discharge ratings – please have your integration partner confirm.

Source and revision record

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