HCS473-I/SLROM(2013) 查看數據表（PDF） - Microchip Technology

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HCS473-I/SLROM
(Rev.:2013)

KEELOQ® 3-Axis Transcoder

Microchip Technology 

HCS473

TABLE 7-3: AC CHARACTERISTICS, FOSC = 4 MHz(1)

AC Characteristics

FOSC = 4 MHz(1)

The min and max values below are due to HCS473 algorithm tolerances,

not variations due to supply voltage and temperature.

Symbol

Min

Typ

Max

Description

General HCS473 Timing

TDB

—

10 ms

—

TQUE

—

2s

—

TPU

—

10.9 ms

—

TPLL

—

19 ms

—

TLEDON

—

100 ms

—

TLEDOFF

—

500 ms

—

Communication from Transponder Reader to HCS473

TCMD

1LFTE+100 s

—

10.2 ms

TTSCMD

1LFTE+100 s

—

10.2 ms

TFINH

100 s

1LFTE

—

Response from HCS473 to Transponder Reader

TSF

1ms+1LFTE

3.5ms+1LFTE

10ms+1LFTE

TTSACK

1LFTE+16 s

1LFTE-11 s

1LFTE+30 s

1 LFTE

1LFTE+44 s

1LFTE+11 s

TTPACK

157 s

179 s

212 s

TWRT

—

4 ms

10 ms

TAOACK

67 s

89 s

122 s

TIFF

—

5.64ms

—

TREAD

205 s

227 s

260 s

THOP

—

19 ms

—

TDAMP

—

1.2 LFTE

—

TDEMOD

—

16.4 ms

—

Debounce Time

Que Window

Power-up Delay Time (includes button debounce)

Encoder Mode PLL activation to first code word

LED ON Time

LED OFF Time

Delay from Transponder Select ACK to next command

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

Delay to wake-up Acknowledge sequence

Delay from TID pulse rising edge to TID Acknowledge

TID = 0

TID > 0

Delay to Transport Code Acknowledge

Delay to Write Acknowledge

Delay to anticollision off Acknowledge

Delay to IFF response - RF or LF response

Delay to read response - RF or LF response

Delay to hopping code response - RF or LF response

Delay from detecting LC rising edge to first damp pulse

Demodulator mode window looking for edge on LC pin

Timing Element TE

TE

RFTE or LFTE

90

100

110

RFBSL = LFBSL = 002

180

200

220

RFBSL = LFBSL = 012

360

400

440

RFBSL = LFBSL = 102

720

800

880

RFBSL = LFBSL = 112

Analog delays

TFILTR

—

15 s

—

HCS473 analog LF filter charge time

TFILTF

—

70 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 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.

DS40035D-page 52

Preliminary

 2000-2013 Microchip Technology Inc.

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