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HCS412SN Datasheet(PDF) 19 Page - Microchip Technology |
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HCS412SN Datasheet(HTML) 19 Page - Microchip Technology |
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19 / 44 page  © 2002 Microchip Technology Inc. Preliminary DS41099C-page 19 HCS412 FIGURE 4-1: FIELD ACKNOWLEDGE SEQUENCE FIGURE 4-2: LC PIN PULSE POSITION MODULATION (PPM) 3LFTE TPU 3LFTE 3LFTE 2LFTE Command TATO Communication from reader to HCS412 Filed ACK Sequence from HCS412 to reader 8LFTE Inductive Comms RF Comms 8LFTE (DATA) (LC) RF Comms (DATA) Field Ack sequence repeats every 255 LFTE if no command is received. 255LFTE 255LFTE (LC) Inductive Comms 0 1 0 1 Start or previous bit Transponder reader communication to the HCS412 HCS412 response back to the reader 2 LFTE 2 LFTE 4 LFTE 2 LFTE 2 LFTE LFTE LFTE LFTE Start or previous bit Extending the high time is acceptable but the low time should minimally be 1 LFTE. TBITC TBITC TBITR TBITR The HCS412 determines bit values from rising edge to rising edge times. |
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