11

4699D–RFID–09/06

e5561

5.3

Start-up

The various modes of the e5561 are activated after the first read-out of the configuration. The

modulation is on during power-on reset and is off while the configuration is read. After this initial-

ization period of 190 + POR time FCs, the e5561 activates the adaption bit setting defined by

configuration and enters in ID mode. If the IC is configured with terminator 1, a data value of FH

acc. selected data coding is sent in advance of terminator and read data (see Figure 5-2).

Figure 5-1.

Application Circuit

Figure 5-2.

Voltage at Coil1/Coil2 after Start-up (e.g., RF/32, Manchester, Terminator 1)

5.4

Configuration

The configuration data of the e5561 is stored in block 0 of the EEPROM which contains the fol-

lowing information (see Figure 5-3 on page 12):

• Type of modulation and bit rate

• ID code length

• Several lock-bits

• Selected terminator

• Stop mode selection for short/long authentication time

• Adaptation of resonance frequency

The configuration may be changed by programming block 0. However, this is only possible if the

lock-bit L_0 in block 0 has not been set.

e5561

Coil 1

Coil 2

V

DD

V

SS

125 kHz

Energy

Data

Tuned LC

Coil of base station

Coil1-Coil2

Load config.

(190 FCs)

Term. 1

V

Power-on reset

Read Fh

Read data with selected

modulation and bit-rate

Adaptation setting

Damping on

Damping off