Rainbow-electronics AT77C105A Uživatelský manuál

5419A–BIOM–01/05Features• Thermal Sensitive Layer Over a 0.35 µm CMOS Array• Image Zone: 0.4 x 11.6 mm• Image Array: 8 × 232 = 1856 Pixels• Pixel Pit

10AT77C105A [Preliminary] 5419A–BIOM–01/05Timing Diagrams: Slow and Fast SPI InterfaceFigure 3. Read Timing Fast SPI Slave ModeFigure 4. Read/Write

11 AT77C105A [Preliminary]5419A–BIOM–01/05Functional DescriptionThe AT77C105A is a fingerprint sensor based on FingerChip technology. It is controlle

12AT77C105A [Preliminary] 5419A–BIOM–01/05Sensor and Block DiagramFigure 7. Functional Block DiagramThe circuit is divided into the following main s

13 AT77C105A [Preliminary]5419A–BIOM–01/05Function RegistersNote: 1. Navigation requires 3 registers. The reading of the first register (0b1000) enab

14AT77C105A [Preliminary] 5419A–BIOM–01/05Status Register Register Name: Status (8 bits)Access Type: Read OnlyFunction: State of AT77C105A• CLICK: Cl

15 AT77C105A [Preliminary]5419A–BIOM–01/05Modectrl Register Register Name: Modectrl (7 bits)Access Type: Read/WriteFunction: Mode control• MODE: Sele

16AT77C105A [Preliminary] 5419A–BIOM–01/05Enctrl Register Register Name: Enctrl (7 bits)Access Type: Read/WriteFunction: Interrupts control• CLICKEN:

17 AT77C105A [Preliminary]5419A–BIOM–01/051: watchdog enabled Watchdog automatically stops heating of the sensor after a time-out.• HEATV (2 bits): H

18AT77C105A [Preliminary] 5419A–BIOM–01/05Sets the minimum analog value detected as a high level (‘1’) and the maximum analog value detected as a low

19 AT77C105A [Preliminary]5419A–BIOM–01/05Two transitions are interpreted as a click if the number of slices between them is less than CLICKCPT. This

2AT77C105A [Preliminary] 5419A–BIOM–01/05Note: The die attach is connected to pin 6 and must be grounded. The FPL pin must also be grounded.Table 1.

20AT77C105A [Preliminary] 5419A–BIOM–01/05Navigation Register Register Name: Navigation (3 x 8 bits)Access Type: Read Only (these three registers can

21 AT77C105A [Preliminary]5419A–BIOM–01/05Note: In the PS/2 protocol, bits b2 and b1 are used to code the middle and right buttons respectively, and

22AT77C105A [Preliminary] 5419A–BIOM–01/05SPI Interface General DescriptionTwo communication busses are implemented in the device:• The control inter

23 AT77C105A [Preliminary]5419A–BIOM–01/05Polarity configures the clock’s idle level, which is high (“1”) during polarity one of the operation and lo

24AT77C105A [Preliminary] 5419A–BIOM–01/05Control Interface (Slow SPI)This interface controls the sensor’s internal registers. The protocol enables r

25 AT77C105A [Preliminary]5419A–BIOM–01/05Communication Speed To reduce consumption, the control interface’s communication speed is set to the lowest

26AT77C105A [Preliminary] 5419A–BIOM–01/05Example of Navigation Registers Figure 12 represents a typical reading sequence of the three navigation reg

27 AT77C105A [Preliminary]5419A–BIOM–01/05Figure 13. Example of an 8-bit AccessDuring an 8-bit access, the sensor transmits two pixels (each pixel i

28AT77C105A [Preliminary] 5419A–BIOM–01/05The first dummy column, at the beginning of the pixel array, is added to the sensor to act as a specific ea

29 AT77C105A [Preliminary]5419A–BIOM–01/058 8 1072 24 Good speed12 12 1608 36 Very good speed16 16 2146 48 Very good speedTable 17. Finger Speeds Ve

3 AT77C105A [Preliminary]5419A–BIOM–01/05Figure 1. Typical ApplicationThe pull-up must be implemented for the master controller. The noise should be

30AT77C105A [Preliminary] 5419A–BIOM–01/05Registration Integration TimeThe pixel’s integration time (the time needed for one frame reading) must be a

31 AT77C105A [Preliminary]5419A–BIOM–01/05Navigation See “Navigation Register” on page 20.The typical navigation slice frequency has been fixed to 2

32AT77C105A [Preliminary] 5419A–BIOM–01/05The dissipated die power is quasi constant over a significant supply voltage range as shown below (mode 50

33 AT77C105A [Preliminary]5419A–BIOM–01/05Navigation and Click Modes Current ConsumptionStatic Current Consumption The SPI bus’ consumption is very l

34AT77C105A [Preliminary] 5419A–BIOM–01/05Package InformationElectrical Disturbances Three areas of the FingerChip device must never be in contact wi

35 AT77C105A [Preliminary]5419A–BIOM–01/05Appendix AController InitializationController Initialized ? Host Controller Initialization SPI Initializat

36AT77C105A [Preliminary] 5419A–BIOM–01/05Appendix BExample for the MODECTRL Register Interrupts Masked SSS/ = 0 YesNo NoYesMODECTRL Writing Requ

37 AT77C105A [Preliminary]5419A–BIOM–01/05Appendix CExample of Navigation Registers Interrupts Masked SSS/ = 0 YesNo NoYes TransferEnded ?NoNAVI

38AT77C105A [Preliminary] 5419A–BIOM–01/05Appendix DExample of an Interrupt Generated by a Movement Detection Interrupts Masked SSS/ = 0 YesNo No

Printed on recycled paper.5419A–BIOM–01/05Disclaimer: The information in this document is provided in connection with Atmel products. No license, exp

4AT77C105A [Preliminary] 5419A–BIOM–01/05SpecificationsTable 2. Absolute Maximum RatingsParameter Symbol Comments ValuePower supply voltage VDDD, VD

5 AT77C105A [Preliminary]5419A–BIOM–01/05Note: TBC = To be confirmedPower Consumption and DC CharacteristicsThe following characteristics are applica

6AT77C105A [Preliminary] 5419A–BIOM–01/05VDD_IO = 1.8VNote: 1. A minimum noise margin of 0.05 VDD should be taken for Schmitt trigger input threshold

7 AT77C105A [Preliminary]5419A–BIOM–01/05VDD_IO = 2.3V to 3.6VInput/Output Voltage Level CompatibilityThe I/O voltage level compatibility is set by t

8AT77C105A [Preliminary] 5419A–BIOM–01/05Switching PerformancesThe following characteristics are applicable to the operating temperature -40°C ≤ T ≤

9 AT77C105A [Preliminary]5419A–BIOM–01/05Table 15. 1.8V ±5% Power SupplyParameter Symbol Test Level Min Typ Max UnitData in setup time TSUnsData in