Datasheet > ATA5551M-PP

ATA5551M-PP

更新时间： 2024-01-23 16:28:59

品牌	Logo	应用领域
爱特美尔 - ATMEL		电信电信集成电路
页数	文件大小	规格书
11页	546K
描述
Telecom Circuit

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ATA5551M-PP 技术参数

生命周期：	Obsolete	包装说明：	,
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8523.59.00.00	风险等级：	5.69
JESD-30 代码：	X-XXSS-X	功能数量：	1
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	UNSPECIFIED	封装形状：	UNSPECIFIED
封装形式：	SPECIAL SHAPE	表面贴装：	NO
电信集成电路类型：	TELECOM CIRCUIT	温度等级：	INDUSTRIAL
端子形式：	UNSPECIFIED	端子位置：	UNSPECIFIED
Base Number Matches：	1

ATA5551M-PP 数据手册

Atmel ATA5551

8. Writing Data into the Atmel ATA5551

The write sequence of the Atmel^®ATA5551 is shown below. Writing data into the transponder

occurs by interrupting the RF field with short gaps. After the start gap the standard write

OP code (10) is followed by the lock bit. The next 32 bits contain the actual data. The last three

bits denote the destination block address. If the correct number of bits have been received, the

actual data is programmed into the specified memory block.

Figure 8-1. Write Protocol

Standard OP-code

Address bits (e.g. block 4)

> 64 clocks

RF Field

32bit

Start gap

Lock bit

Write mode

Read mode

9. Write Data Decoding

The time elapsing between two detected gaps is used to encode the information. As soon as a

gap is detected, a counter starts counting the number of field clock cycles until the next gap is

detected. Depending on how many field clocks elapse, the data is regarded as “0” or “1”. The

required number of field clocks is shown in Figure 9-1. A valid “0” is assumed if the number of

counted clock periods is between 16 and 32, for a valid “1” it is 48 or 64 respectively. Any other

value being detected results in an error, and the device exits write mode and returns to read

mode.

Figure 9-1. Write Data Decoding Scheme

Field clock cycles

Write data decoder

fail

writing done

10. Actual Behavior of the Device

The Atmel ATA5551 detects a gap if the voltage across the coils decreases below the threshold

value of an internal MOS transistor. Until then, the clock pulses are counted. The number given

for a valid “0” or “1” (see Figure 9-1) refers to the actual clock pulses counted by the device.

However, there are always more clock pulses being counted than were applied by the base

station. The reason for this is the fact that an RF field cannot be switched off immediately. The

coil voltage decreases exponentially. So although the RF field coming from the base station is

switched off, it takes some time until the voltage across the coils reaches the threshold value of

an internal MOS transistor and the device detects the gap.

Referring to the following diagram (see Figure 10-1 on page 8), this means that the device uses

the times t_{0 internal}and t_{1 internal}. The exact times for t₀and t₁are dependent on the application

(e.g., field strength, etc.).

9211A–RFID–10/10

1...4 5 678 9 10 11

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与ATA5551M-PP相关器件

型号	品牌	描述	获取价格	数据表
ATA5551M-PPMY	MICROCHIP	IC ID R/W TRANSPONDER PLASTIC	获取价格
ATA5557	ATMEL	High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture	获取价格
ATA5558	ATMEL	1 kbit R/W IDIC with Deterministic Anticollision	获取价格
ATA5558_08	ATMEL	1 kbit R/W IDIC with Deterministic Anticollision	获取价格
ATA5558_09	ATMEL	1 kbit R/W IDIC with Deterministic Anticollision	获取价格
ATA555811-DDB	ATMEL	1 kbit R/W IDIC with Deterministic Anticollision	获取价格

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