HCS412SN datasheet(28/44 Pages) MICROCHIP

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HCS412

DS41099C-page 28

Preliminary

4.4.2

ANTICOLLISION AND RF ECHO

(LFSP = 11)

In addition to enabling anticollision, this mode adds that

all HCS412 responses and Acknowledges are echoed

on the DATA output line. Responses are first transmit-

ted on the DATA line, followed by the equivalent data

transmitted

the

lines

(Figure 4-16,

Figure 4-17).

LF communication from the token to the transponder

reader has much less range than LF communication

from the reader to the token. Transmitting the informa-

tion on the DATA line increases communication range

by enabling longer range RF talk back.

The information is sent on the DATA line first to benefit

longer range passive-entry authentication times.

FIGURE 4-16: RF ECHO OPTION AND READ COMMAND

FIGURE 4-17: RF ECHO OPTION AND IFF COMMAND

FIGURE 4-18: RF ECHO OPTION AND REQUEST HOPPING CODE COMMAND

DATA (RF)

ACK

TPU

TATO

LF Communication from reader to HCS412

LF Communication from HCS412 to reader

TOTH

Inductive

(LF)

32-Bit Response

16-Bit

Response

16-Bit

Response

LF Communication from reader to HCS412

LF Communication from HCS412 to reader

DATA (RF)

Inductive (LF)

LF Communication from reader to HCS412

LF Communication from HCS412 to reader

DATA (RF)

Field

ACK

32-Bit PPM

Response

Field

Ack

TOTH

TATO

Request Hopping

Code Opcode

Inductive

(LF)

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