HCS473_13 Datasheet, PDF (53/68 Pages) Microchip Technology – KEELOQ® 3-Axis Transcoder

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
2s
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 s
1 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
60 s
89 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
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. 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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Preliminary
DS40035D-page 53