HCS473_13 datasheet(53/68 Pages) MICROCHIP

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Preliminary

DS40035D-page 53

HCS473

TABLE 7-4:

AC CHARACTERISTICS, Commercial Temperature Devices

AC Characteristics

Tamb = 0°C to 70°C, 2.05V < VDD < 5.5V

FOSC = 4 MHz ±10%

Symbol

Min

Typ

(1)

Max

Description

General HCS473 Timing

TDB

9 ms

10 ms

11 ms

Debounce Time

TQUE

1.8s

2.2s

Que Window

TPU

9.81 ms

10.9 ms

12 ms

Power-up Delay Time (includes button debounce)

TPLL

17.1 ms

19 ms

20.9 ms

Encoder Mode PLL activation to first code word

TLEDON

90 ms

100 ms

110 ms

LED ON Time

TLEDOFF

450 ms

500 ms

550 ms

LED OFF Time

Communication from Transponder Reader to HCS473

TCMD

1.1 LFTE+100

s

—

9.18 ms

TTSCMD

1.1 LFTE+100

s

—

9.18 ms

Delay from Transponder Select ACK to next command

TFINH

100

s1 LFTE

—

Time to leave LF on after last data bit’s rising edge

Response from HCS473 to Transponder Reader

TSF

1 ms+.9 LFTE

3.5 ms+1 LFTE

10 ms+1. 1LFTE

Delay to wake-up Acknowledge sequence

TTSACK

.9 LFTE+14

s

.9 LFTE-12

s

1 LFTE+30

s

1 LFTE

1.1 LFTE+49

s

1.1 LFTE+12

s

Delay from TID pulse rising edge to TID acknowledge

TID = 0

TID > 0

TTPACK

141

s

179

s

234

s

Delay to Transport Code Acknowledge

TWRT

—

4 ms

10ms

Delay to Write Acknowledge

TAOACK

s

135

s

Delay to anticollision off Acknowledge

TIFF

5.07 ms

5.64 ms

6.2 ms

Delay to IFF response - RF or LF response

TREAD

184

s

227

s

286

s

Delay to read response - RF or LF response

THOP

17.1 ms

19 ms

20.9 ms

Delay to hopping code response - RF or LF response

TDAMP

1.08 LFTE

1.2 LFTE

1.32 LFTE

Delay from detecting LC rising edge to first damp pulse

TDEMOD

14.76 ms

16.4 ms

18 ms

Demodulator mode window looking for edge on LC pin

Timing Element TE

180

360

720

100

200

400

800

110

220

440

880

RFTE or LFTE

RFBSL = LFBSL = 002

RFBSL = LFBSL = 012

RFBSL = LFBSL = 102

RFBSL = LFBSL = 112

Analog delays

TFILTR

—

s

—

HCS473 analog LF filter charge time

TFILTF

—

s

—

HCS473 analog LF filter discharge time

TANTR

Hardware design dependent

Cumulative LF antenna delay when field is turned on

TANTF

Hardware design dependent

Cumulative LF antenna delay when field is turned off

Note

1: Fosc = 4 MHz. FOSC = 4 MHz may be centered at the designer’s choice of supply voltage (VDD) and temperature.

2: LFTE 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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