This document describes the implementation of the interface between an ADSP-BF533 Blackfin® processor and an Atmel® AT77C104B FingerChi
This Engineer-to-Engineer Note (EE-Note) demonstrates the implementation of an interface between an ADSP-BF533 Blackfin processor and an Atmel AT77C104B FingerChip thermal fingerprint sensor. The document explains the thermal sensing technology used by the sensor, which captures images as a finger is swept over the device surface without requiring external heat or light sources.
The guide provides technical details on interfacing the sensor via the Serial Peripheral Interface (SPI), covering both fast mode for data acquisition and slow mode for configuration. It includes information on command formats, transfer protocols, and specific register usage to control navigation, click detection, and image capture modes.
| Resolution | 500 dpi |
|---|---|
| Sensor Area | 0.4 x 11.6 mm |
| Pixel Count | 8 rows by 232 columns (1856 pixels) |
| Dynamic Range | 16 grayscale levels (4 bits per pixel) |
| Slow SPI Mode Speed | 200 Kbps (max) |
| Operating Voltage | 2.3 V to 3.6 V |
| Operating Temperature | -40°C to +85°C |
The document demonstrates interfacing with an ADSP-BF533 Blackfin processor.
No, soldering may cause permanent damage; it uses an elastomer connector.