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HCS473-SLROM 数据表(PDF) 55 Page - Microchip Technology |
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HCS473-SLROM 数据表(HTML) 55 Page - Microchip Technology |
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55 / 68 page  2002 Microchip Technology Inc. Preliminary DS40035C-page 53 HCS473 TABLE 7-4: AC CHARACTERISTICS, Commercial Temperature Devices AC Characteristics Tamb = 0°C to 70°C, 2.05V < V DD < 5.5V F OSC = 4 MHz ±10% Symbol Min Typ (1) Max Description General HCS473 Timing T DB 9 ms 10 ms 11 ms Debounce Time T QUE 1.8s 2s 2.2s Que Window T PU 9.81 ms 10.9 ms 12 ms Power-up Delay Time (includes button debounce) T PLL 17.1 ms 19 ms 20.9 ms Encoder Mode PLL activation to first code word T LEDON 90 ms 100 ms 110 ms LED ON Time T LEDOFF 450 ms 500 ms 550 ms LED OFF Time Communication from Transponder Reader to HCS473 T CMD 1.1 LF TE+100 µs — 9.18 ms T TSCMD 1.1 LF TE+100 µs — 9.18 ms Delay from Transponder Select ACK to next command T FINH 100 µs1 LFTE — Time to leave LF on after last data bit’s rising edge Response from HCS473 to Transponder Reader T SF 1ms+.9 LF TE 3.5 ms+1 LF TE 10 ms+1. 1LF TE Delay to wake-up Acknowledge sequence T TSACK .9 LF TE+14 µs .9 LF TE-12 µs 1LF TE+30 µs 1LF TE 1.1 LF TE+49 µs 1.1 LF TE+12 µs Delay from TID pulse rising edge to TID acknowledge TID = 0 TID > 0 T TPACK 141 µs 179 µs 234 µs Delay to Transport Code Acknowledge T WRT — 4 ms 10ms Delay to Write Acknowledge T AOACK 60 µs89 µs 135 µs Delay to anticollision off Acknowledge T IFF 5.07 ms 5.64 ms 6.2 ms Delay to IFF response - RF or LF response T READ 184 µs 227 µs 286 µs Delay to read response - RF or LF response T HOP 17.1 ms 19 ms 20.9 ms Delay to hopping code response - RF or LF response T DAMP 1.08 LF TE 1.2 LF TE 1.32 LF TE Delay from detecting LC rising edge to first damp pulse T DEMOD 14.76 ms 16.4 ms 18 ms Demodulator mode window looking for edge on LC pin Timing Element T E T E 90 180 360 720 100 200 400 800 110 220 440 880 RFT E or LFTE RFBSL = LFBSL = 002 RFBSL = LFBSL = 012 RFBSL = LFBSL = 102 RFBSL = LFBSL = 112 Analog delays T FILTR —15 µs — HCS473 analog LF filter charge time T FILTF —70 µs — HCS473 analog LF filter discharge time T ANTR Hardware design dependent Cumulative LF antenna delay when field is turned on T ANTF Hardware design dependent Cumulative LF antenna delay when field is turned off Note 1: Fosc = 4 MHz. F OSC = 4 MHz may be centered at the designer’s choice of supply voltage (VDD) and temperature. 2: LF TE is based on the HCS473’s timing, not the timing of the transponder reader. Therefore LFTE is subject to HCS473 oscillator variation. 3: Response timing accounts for TFILTR but not for TANTR or TANTF, as they are design dependent. The system designer must compensate communication accordingly for TANTR and TANTF. 4: Timing parameters are characterized but not tested. |
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