CR14_10 datasheet(39/47 Pages) STMICROELECTRONICS

Part #	CR14

Description	ISO14443 type-B contactless coupler chip with anti-collision and CRC management

PDF	47 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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39 / 47 page

CR14

DC and AC parameters

Doc ID 11922 Rev 2

39/47

Figure 35.

CR14 synchronous timing

tRFSBL

tRFF

tRFR

tPOR

VRFOUT

fCC

RFOUT ASK Modulated Signal

EOF

DATA

FRAME transmitted by the CR14 in ASK

847kHz

SOF

1 1 0 DATA

1 0 DATA

1 0

FRAME transmitted by the PICC in BPSK

tDR

tDA

START

tRFSBL

tJIT

Data jitter on FRAME transmitted by the CR14 in ASK

ai12056

FRAME transmission between the reader and the contactless device

Table 13.

RFOUT AC characteristics

Symbol

Parameter

Condition

Min.

Max.

Unit

fCC

External Oscillator Frequency

VCC = 5 V

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

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