hcs473 Microchip Technology Inc., hcs473 Datasheet - Page 57

• Manufacturer Part Number: hcs473
• Description: Code Hopping Encoder And Transponder
• Manufacturer: Microchip Technology Inc.

 2002 Microchip Technology Inc.
Analog delays
T
T
T
T
Note 1: Fosc = 4 MHz. F
ANTR
ANTF
FILTR
FILTF
2: LF
3: Response timing accounts for T
4: Min and Max values modified for F
ture.
HCS473 oscillator variation.
designer must compensate communication accordingly for T
tested. Very Important: Refer to Section 3.2.7 for communication requirements when using an Industrial tem-
perature device at 3.5V < V
TE
is based on the HCS473’s timing, not the timing of the transponder reader. Therefore LF
—
—
Hardware design dependent
Hardware design dependent
OSC
= 4 MHz may be centered at the designer’s choice of supply voltage (V
15 µs
70 µs
DD
< 5.5V.
FILTR
OSC
but not for T
= 4 MHz + 10%, -20%. Timing parameters are characterized but not
Preliminary
—
—
ANTR
or T
HCS473 analog LF filter charge time
HCS473 analog LF filter discharge time
Cumulative LF antenna delay when field is turned on
Cumulative LF antenna delay when field is turned off
ANTF
ANTR
, as they are design dependent. The system
and T
ANTF
.
HCS473
DS40035C-page 55
DD
TE
) and tempera-
is subject to