AT77C104BCH08YV Atmel, AT77C104BCH08YV Datasheet - Page 12

• Manufacturer Part Number: AT77C104BCH08YV
• Manufacturer: Atmel

Specifications of AT77C104BCH08YV

• Lead Free Status / Rohs Status: Compliant

8. Functional Description
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AT77C104B
The AT77C104B 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:
In the final application, three main modes are used:
Note:
– Sleep Mode: a very low consumption mode controlled by the reset pin RST. In this
– Stand-by Mode: also a low consumption mode that waits for an action from the
– Click Mode: waits for a finger on the sensor. The SSPI and control blocks are
– Navigation Mode: calculates the finger’s x and y movements across the sensor.
– Acquisition Mode: slices are sent to the host for finger reconstruction and
– Test: this mode is reserved for factory testing.
– Stand-by: low consumption mode
– Pointing: equivalent to click and navigation modes
– Acquisition: fingerprint image capture
mode, the internal clocks are disabled and the registers are initialized.
host. The slow serial port interface (SSPI) and control blocks are activated. In this
mode the oscillator can remain active.
activated. The local oscillator, the click array and the click block are all activated.
The SSPI and control blocks are still activated. The local oscillator, the navigation
array and the navigation block are also activated.
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.
The term "host" describes the processor (controller, DSP...) linked to the sensor. It is the master. In
the description of n-bit registers (see
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_.
“Function Registers” on page 14
), the term "b0"
5347F–BIOM–3/08