HCS473-SLROM datasheet(57/68 Pages) MICROCHIP

57 / 68 page

 2002 Microchip Technology Inc.

Preliminary

DS40035C-page 55

HCS473

Analog delays

FILTR

—15

µs

—

HCS473 analog LF filter charge time

FILTF

—70

µs

—

HCS473 analog LF filter discharge time

ANTR

Hardware design dependent

Cumulative LF antenna delay when field is turned on

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 tempera-

ture.

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: Min and Max values modified for F

OSC = 4 MHz + 10%, -20%. Timing parameters are characterized but not

tested. Very Important: Refer to Section 3.2.7 for communication requirements when using an Industrial tem-

perature device at 3.5V < V

DD < 5.5V.

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