E5551 데이터 시트보기 (PDF) - Temic Semiconductors

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E5551

Standard R/W Identification IC with Anticollision

Temic Semiconductors 

e5551

RF_Field

Gap

Start

1

0

1

1

Write mode

Damping

Write data

Modulation during read mode

Load On

Data Clock

Field clock

Read mode

Writing

>64 FCs = stop write

0

Load Off

Programming Read mode

Figure 15. Signals during writing

1

16

32

48

64

Write data decoder

fail

0

fail

1

Figure 16. Write data decoding schemes

OP

Standard write

10 L 1

Data bits

OP

Password mode

10 1

Password

OP

AOR (wake-up command) 10 1

OP

Password

Direct access

10 L 2 Addr 0

OP

Stop command

11

32 2 Addr 0

32 L 1

Data bits

32

Figure 17. e5551 – OP-code formats

writing done

32 2 Addr 0

Write

Writing data into the IC occurs via the TEMIC write

method. It is based on interrupting the RF field with short

gaps. The time between two gaps encodes the ‘0/1’

information to be transmitted.

Start Gap

The first gap is the start gap which triggers write mode.

In write mode, the damping is permanently enabled

which eases gap detection. The start gap may need to be

longer than subsequent gaps in order to be detected

reliably.

A start gap will be detected at any time after block 0 has

been read (field-on plus approximately 2 ms).

10 (21)

Rev. A2, 19-Apr-00

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