Rainbow-electronics AT77C104B User Manual

5347B–BIOM–08/04Features• 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

10AT77C104B 5347B–BIOM–08/04Sensor and Block DiagramFigure 7. Functional Block DiagramThe circuit is divided into the following main sections:• An

11 AT77C104B 5347B–BIOM–08/04Function RegistersNote: 1. Navigation requires 3 registers. The reading of the first register (0b1000) enables the readi

12AT77C104B 5347B–BIOM–08/04Status Register Register Name:Status (8 bits)Access Type:Read OnlyFunction:State of AT77C104B• CLICK: click detection 0:

13 AT77C104B 5347B–BIOM–08/04Modectrl Register Register Name:Modectrl (7 bits)Access Type:Read/WriteFunction:Mode control• MODE: select operating mod

14AT77C104B 5347B–BIOM–08/04Enctrl Register Register Name:Enctrl (7 bits)Access Type:Read/WriteFunction:Interrupts control• CLICKEN: click interrupt

15 AT77C104B 5347B–BIOM–08/04• HEATV (2 bits): heating power value 00: 50 mW 01: 100 mW 10: reserved 11: reservedVDD is between 2.6 and 3.6V.Notes: 1

16AT77C104B 5347B–BIOM–08/04Notes: 1. Navfreq and Navv registers should not be changed once the navigation mode is selected. Finger sensitivity refe

17 AT77C104B 5347B–BIOM–08/04This register adjusts the “time out” for considering the two transitions as a click.Note: Clickfreq and Clickcpt registe

18AT77C104B 5347B–BIOM–08/04Navigation Register Register Name:Navigation (3 x 8 bits)Access Type:Read Only (these three registers cannot be read ind

19 AT77C104B 5347B–BIOM–08/04Note: In the PS/2 protocol, bits b2 and b1 are used to code the middle and right buttons respectively, and b3 is set to

2AT77C104B 5347B–BIOM–08/04Note: The die attach is connected to pin 6 and must be grounded. The FPL pin must also be grounded.Table 1. Pin Descript

20AT77C104B 5347B–BIOM–08/04SPI Interface General DescriptionTwo communication busses are implemented in the device:• The control interface, a slow

21 AT77C104B 5347B–BIOM–08/04Polarity configures the clock’s idle level, which is high ('1') during polarity one of the operation and low (

22AT77C104B 5347B–BIOM–08/04Control Interface (Slow SPI)This interface controls the sensor’s internal registers. The protocol enables reading and wr

23 AT77C104B 5347B–BIOM–08/04Communication Speed To reduce consumption, the control interface’s communication speed is set to the lowest possible spe

24AT77C104B 5347B–BIOM–08/04Example of Navigation Registers Figure 12 represents a typical reading sequence of the three navigation registers.Refer

25 AT77C104B 5347B–BIOM–08/04Figure 14. Fast SPI CommunicationCommunication Speed The acquisition speed of the pixels is linked to the clock’s commu

26AT77C104B 5347B–BIOM–08/04Figure 16. Reading of FrameNotes: 1. For the first array or frame reading, 40 dummy clock cycles must be sent before th

27 AT77C104B 5347B–BIOM–08/04Registration Integration TimeThe pixel’s integration time (the time needed for one frame reading) must be as regular as

28AT77C104B 5347B–BIOM–08/04Navigation See “Navigation Register” on page 18The typical navigation slice frequency has been fixed to 2.9 kHz. A prog

29 AT77C104B 5347B–BIOM–08/04The dissipated die power is quasi constant over a significant supply voltage range as shown below (mode 50 mW selected):

3 AT77C104B 5347B–BIOM–08/04Figure 1. Typical ApplicationThe pull-up must be implemented for the master controller. The noise should be lower than 3

30AT77C104B 5347B–BIOM–08/04Navigation and Click Modes Current ConsumptionStatic Current Consumption The SPI bus’ consumption is very low in click a

31 AT77C104B 5347B–BIOM–08/04Package InformationElectrical Disturbances Three areas of the FingerChip device must never be in contact with the casing

32AT77C104B 5347B–BIOM–08/04Appendix AController InitializationController Initialized ? Host Controller Initialization SPI Initialization (Phase =

33 AT77C104B 5347B–BIOM–08/04Appendix BExample for the MODECTRL Register Interrupts Masked SSS/ = 0 YesNo NoYesMODECTRL Writing Requested Sending

34AT77C104B 5347B–BIOM–08/04Appendix CExample of Navigation Registers Interrupts Masked SSS/ = 0 YesNo NoYes TransferEnded ?NoNAVIGATION Readin

35 AT77C104B 5347B–BIOM–08/04Appendix DExample of an Interrupt Generated by a Movement Detection Interrupts Masked SSS/ = 0 YesNo NoYesNAVIGATION

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4AT77C104B 5347B–BIOM–08/04SpecificationsTable 2. Absolute Maximum RatingsParameter Symbol Comments ValuePower supply voltage VDDD, VDDA -0.5 to 4.

5 AT77C104B 5347B–BIOM–08/04Power Consumption and DC CharacteristicsThe following characteristics are applicable to the operating temperature -40° C

6AT77C104B 5347B–BIOM–08/04Note: 1. A minimum noise margin of 0.05 VDD should be taken for Schmitt trigger input threshold switching levels compared

7 AT77C104B 5347B–BIOM–08/04Switching PerformancesThe following characteristics are applicable to the operating temperature -40° C ≤ Ta ≤ +85° C. Typ

8AT77C104B 5347B–BIOM–08/04Timing Diagrams: Slow and Fast SPI InterfaceFigure 3. Read Timing Fast SPI Slave ModeFigure 4. Read/Write Timing Slow S

9 AT77C104B 5347B–BIOM–08/04Functional DescriptionThe AT77C104B is a fingerprint sensor based on FingerChip technology. It is controlled by an SPI se