CRX14_10 Datasheet, PDF (39/47 Pages) STMicroelectronics – ISO14443 type-B contactless coupler chip with anti-collision, CRC management and anti-clone function

CRX14
Figure 35. CRX14 synchronous timing
RFOUT ASK Modulated Signal
DC and AC parameters
VRFOUT
tRFSBL
tRFF
A
B
tRFR
tPOR
fCC
FRAME transmission between the reader and the contactless device
tDR
1
tDR
0 DATA 1
EOF
FRAME transmitted by the CRX14 in ASK
FRAME transmitted by the PICC in BPSK
847kHz
SOF 1 1 0 DATA 1 0 DATA 1 0
t0
t1
tDA
tDA
Data jitter on FRAME transmitted by the CRX14 in ASK
tJIT
tJIT
tJIT
tJIT
tJIT
0
START
tRFSBL
tRFSBL
tRFSBL
tRFSBL
tRFSBL
ai09258
Table 13. RF_OUT AC characteristics
Symbol
Parameter⁽¹⁾
f_CC
MI_CARRIER
t_RFR, t_RFF
t_RFSBL
t_JIT
t₀
t₁
External Oscillator Frequency
Carrier Modulation Index
10% Rise and Fall time
Pulse Width on RF_OUT
ASK modulation bit jitter
Antenna Reversal delay
Synchronization delay
Condition
V_CC = 5 V
MI=(A-B)/(A+B)
1 ETU = 128/f_CC
CRX14 to PICC
Min = 64/f_S
Min = 80/f_S
Min.
13.553
10
0.5
9.44
-0.5
75
94
Max.
13.567
14
1.5
0.5
Unit
MHz
%
µs
µs
µs
µs
µs
Doc ID 8880 Rev 4
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