E5551 Просмотр технического описания (PDF) - Temic Semiconductors

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E5551

Standard R/W Identification IC with Anticollision

Temic Semiconductors 

e5551

Memory

The memory of the e5551 is a 264 bit EEPROM, which

is arranged in 8 blocks of 33 bits each. All 33 bits of a

block, including the lock bit, are programmed simulta-

neously. The programming voltage is generated on-chip.

Block 0 contains the mode data, which are not normally

transmitted (see figure 6).

Block 1 to 6 are freely programmable. Block 7 may be

used as a password. If password protection is not required,

it may be used for user data.

Bit 0 of every block is the lock bit for that block. Once

locked, the block (including the lockbit itself) cannot be

field-reprogrammed.

Data from the memory is transmitted serially, starting

with block 1, bit 1, up to block ‘MAXBLK’, bit 32.

‘MAXBLK’ is a mode parameter set by the user to a value

between 0 and 7 (if maxblk=0, only block 0 will be trans-

mitted).

01

32

L

User data or password

Block 7

L

User data

Block 6

L

User data

Block 5

L

User data

Block 4

L

User data

Block 3

L

User data

Block 2

L

User data

Block 1

L

Configuration data

Block 0

32 bits

Not transmitted

Figure 5. Memory map

From memory

Carrier frequency

Manchester

PSK1

PSK2

PSK3

Direct

Mux

Direct

Mux

Biphase

FSK1, 1a

FSK2, 2a

Figure 6. Modulator block diagram

To load

4 (21)

Rev. A2, 19-Apr-00

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