HCS473-SLROM datasheet(24/68 Pages) MICROCHIP

24 / 68 page

HCS473

DS40035C-page 22

Preliminary

 2002 Microchip Technology Inc.

3.2.2.4

Command Sequence

The transponder reader follows the HCS473’s Field

Acknowledge by sending the desired 3-bit command,

3-bit option or address, associated data and CRC;

each as required. LF commands are Pulse Position

Modulated (PPM) as shown in Figure 3-10. The last bit

(CRC bit) should be followed by leaving the field on for

FINH.

FINH should be appropriately adjusted to receive con-

secutive

commands

responses.

See

Section 3.2.4 and Section 3.2.5 for LF response and

consecutive command considerations.

FIGURE 3-11:

HCS473 TRANSPONDER WAKE-UP SEQUENCE

Communication from reader to HCS473

Communication from HCS473 to reader

SKIPACK = 1 - Field Acknowledge is not sent

Inductive

(LC)

Command

CMD

SFMAX

SKIPACK = 0 - Field Acknowledge sent when device wakes

Inductive

(LC)

Response

(DATA)

125kHz Field

(on LC pins)

CMD

Command

CMD

3LF

TE 3LFTE

Simultaneous LF

Acknowledge

(LFRSP=1)

RF Acknowledge

(RFRSP=1)

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