AT77C105ACB08V- datasheet(11/39 Pages) ATMEL

Part #	AT77C105ACB08V-

Description	FingerChip Thermal Fingerprint Sweep Sensor, Hardware Based Navigation and Click Functions, Extended I/O range(1.8-3.3V)

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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AT77C105A [Preliminary]

5419A–BIOM–01/05

Functional Description

The AT77C105A is a fingerprint sensor based on FingerChip technology. It is controlled

by an SPI serial interface through which output data is also transferred (a slow SPI for

the pointing function and a fast one for acquisition). Six modes are implemented:

–

Sleep Mode: A very low consumption mode controlled by the reset pin RST.

In this mode, the internal clocks are disabled and the registers are initialized.

–

Stand-by Mode: Also a low consumption mode that waits for an action from

the host. The slow serial port interface (SSPI) and control blocks are

activated. In this mode the oscillator can remain active.

–

Click Mode: Waits for a finger on the sensor. The SSPI and control blocks

are activated. The local oscillator, the click array and the click block are all

activated.

–

Navigation Mode: Calculates the finger’s x and y movements across the

sensor. The SSPI and control blocks are still activated. The local oscillator,

the navigation array and the navigation block are also activated.

–

Acquisition Mode: Slices are sent to the host for finger reconstruction and

identification. The SSPI and control blocks are still activated. The fast serial

port interface block (FSPI) and the acquisition array are activated, as well as

the local oscillator when watchdog is required.

–

Test: This mode is reserved for factory testing.

In the final application, three main modes are used:

–

Stand-by: Low consumption mode

–

Pointing: Equivalent to click and navigation modes

–

Acquisition: Fingerprint image capture

Note:

The term”host” describes the processor (controller, DSP...) linked to the sensor. It is the

master. In the description of n-bit registers (see “Function Registers” on page 13), the

term “b0” describes the Least Significant Bit (LSB). The term “b(n-1)” describes the Most

Significant Bit (MSB). Binary data is written as 0b_ and hexadecimal data as 0x_.

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AT77C105ACB08V- Datasheet(PDF) 11 Page - ATMEL Corporation

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