HCS473_13 datasheet(55/68 Pages) MICROCHIP

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Preliminary

DS40035D-page 55

HCS473

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 tempera-

ture.

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: Min and Max values modified for FOSC = 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 < VDD < 5.5V.

HCS473 Datasheet(PDF) 55 Page - Microchip Technology