CR14 datasheet(41/46 Pages) STMICROELECTRONICS

41 / 46 page

CR14

9 DC and AC parameters

41/46

Table 13.

RFOUT AC Characteristics

Data specified in the table above are estimated or target values. All values can be updated during product

qualification.

Table 14.

RFIN AC Characteristics

Data specified in the table above are estimated or target values. All values can be updated during product

qualification.

Symbol

Parameter

Condition

Min.

Max.

Unit

fCC

External Oscillator Frequency

VCC = 5V

13.553

13.567

MHz

MICARRIER

Carrier Modulation Index

MI=(A-B)/(A+B)

tRFR,tRFF

10% Rise and Fall time

0.5

1.5

µs

tRFSBL

Pulse Width on RFOUT

1 ETU = 128/fCC

9.44

µs

tJIT

ASK modulation bit jitter

CR14 to PICC

-0.5

0.5

µs

Antenna Reversal delay

Min = 64/fS

µs

Synchronization delay

Min = 80/fS

µs

tWDG

Answer delay watchdog (b5=0, b6=0)

Request EOF

rising edge to

first Answer

start bit

500

µs

tWDG

Answer delay watchdog (b5=0, b6=1)

5ms

tWDG

Answer delay watchdog (b5=1, b6=0)

tWDG

Answer delay watchdog (b5=1, b6=1)

309

tDR

Time Between Request characters

CR14

to PICC

9.44

µs

RFOUT output power

tPOR

CR14

Power-On delay

Symbol

Parameter

Condition

Min.

Max.

Unit

tRFSBL

PICC Pulse Width

1 ETU = 128/fCC

9.44

µs

PICC Sub-carrier Frequency

fCC/16

847.5

KHz

tDA

Time Between Answer characters

PICC to CR14

1, 2, 3

ETU

VDYN

RFIN Dynamic Voltage Level

VDYN Max for VOFFSET =

VCC/2

0.5

VCC/2

VOFFSET

RFIN Offset Voltage Level

VRET

RFIN Retro-modulation Level

120

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