ATA5577C [DATASHEET]

9187H–RFID–07/14

4

4.

Atmel ATA5577C - Functional Blocks

Figure 4-1.

Block Diagram

4.1

Analog Front End (AFE)

The AFE includes all circuits that are directly connected to the coil terminals. It generates the IC's power supply and handles

the bi-directional data communication with the reader. It consists of the following blocks.

●

Rectifier to generate a DC supply voltage from the AC coil voltage

●

Clock extractor

●

Switchable load between Coil1 and Coil2 for data transmission from the tag to the reader

●

Field-gap detector for data transmission from the base station to the tag

●

ESD-protection circuitry

4.2

AFE Option Register

The option register maintains a readable shadow copy of the data held in the EEPROM block 3, page 1. This contains the

analog front end's level and threshold settings, as well as enhanced downlink protocol selection with which the device can be

fine tuned for perfect operation and all application environments. It is continually refreshed during read-mode operation and

(re)-loaded after every power-on reset (POR) event or reset command. By default, the option register is pre-programmed

according to Table 10-1 on page 39.

4.3

Data-rate Generator

The data rate is binary programmable to operate at any even-numbered data rate between RF/2 and RF/128, or to any of the

fixed, basic-mode data rates (RF/8, RF/16, RF/32, RF/40, RF/50, RF/64, RF/100 and RF/128).

4.4

Write Decoder

protocol (pulse interval encoding).

Memory

(363-bit EEPROM)

Modulator

AFE option register

POR

Coil 2

Coil 1

Controller

Test logic

HV generator

Input register

Mode register