Datasheet > ATA5558

ATA5558

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
爱特美尔 - ATMEL		/
页数	文件大小	规格书
42页	672K
描述
1 kbit R/W IDIC with Deterministic Anticollision

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ATA5558 数据手册

ATA5558 [Preliminary]

2.2

2.3

Power-On Reset (POR) and Initialization

The Power-On-Reset circuit (POR) maintains the circuit in a reset state until an adequate inter-

nal operating voltage threshold level has been reached, whereupon a default start-up delay

sequence is started. During this period of 200 field clock cycles, the configuration and security

setup is initialized from the System Configuration and Page Security blocks.

Control Logic

The control logic is responsible for the following functions:

• Initialization and reloading of the configuration from EEPROM

• Control of read and write memory access operations

• Data transmission and command decoding

• CRC check, error detection and error handling

2.4

Modulator

The modulator output circuitry controls the switching of a resistive load between the Coil 1 and

Coil 2 pads to transmit data from the tag to the interrogator (uplink). The ASK load modulator is

driven from the Manchester, Bi-phase encoder or directly from the EEPROM memory data

stream (NRZ) according to the uplink encoding configuration.

Table 2-1.

Types of Modulation

Uplink Mode

Manchester Encoding

Bi-phase Encoding⁽¹⁾

NRZ – Direct Data

ASK-coded

modulation

0 = falling edge on mid bit

1 = rising edge on mid bit

0 = rising or falling edge

1 = no edge on mid bit

1 = modulation off

0 = modulation on

Note:

1. Since Bi-phase encoding is data dependent the following definitions apply to the ATA5558

implementation.

- The tag modulates the first (half) bit period after SOF.

- If the last bit of a data stream is a logical 1 it is possible that this bit period is non-modu-

lated and therefore is not detectable directly by the reader.

Figure 2-1. Manchester Timing Diagram

Data rate = F_RF/16

NRZ data stream

Manchester

coded Modulator

signal

Manchester coded

RF field

4681C–RFID–09/05

1 234 5 6 7...42

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