CRX14_05 Datasheet, PDF (35/40 Pages) STMicroelectronics – Low Cost ISO14443 type-B Contactless Coupler Chip with Anti-Collision, CRC Management and Anti-Clone Function

CRX14
Table 13. RF_OUT AC Characteristics
Symbol
Parameter
Condition
Min. Max. Unit
f_CC
External Oscillator Frequency
V_CC = 5V
13.553 13.567 MHz
MI_CARRIER Carrier Modulation Index
MI=(A-B)/(A+B)
10
14
%
t_RFR, t_RFF
10% Rise and Fall time
0.5
1.5
µs
t_RFSBL
Pulse Width on RF_OUT
1 ETU = 128/f_CC
9.44
µs
t_JIT
ASK modulation bit jitter
CRX14 to PICC
-0.5
0.5
µs
t₀
Antenna Reversal delay
Min = 64/f_S
75
µs
t₁
Synchronization delay
Min = 80/f_S
94
µs
t_WDG
t_WDG
t_WDG
t_WDG
Answer delay watchdog (b₅=0, b₆=0)
Answer delay watchdog (b₅=0, b₆=1)
Answer delay watchdog (b₅=1, b₆=0)
Answer delay watchdog (b₅=1, b₆=1)
Request EOF
rising edge
to
first Answer
start bit
500
µs
5
ms
10
ms
309
ms
t_DR
Time Between Request characters CRX14 to PICC
9.44
µs
P_A
RF_OUT output power
90
mW
t_POR
CRX14 Power-On delay
20
ms
Note: 1. Note:Data specified in the table above are estimated or target values. All values can be updated during product qualification.
Table 14. RF_IN AC Characteristics
Symbol
Parameter
Condition
Min. Max. Unit
t_RFSBL PICC Pulse Width
1 ETU = 128/f_CC
9.44
µs
f_S
PICC Sub-carrier Frequency
f_CC/16
847.5
KHz
t_DA
Time Between Answer characters
PICC to CRX14
1, 2, 3
ETU
V_DYN
RF_IN Dynamic Voltage Level
V_DYN Max for V_OFFSET = V_CC/2 0.5
V_CC/2
V
V_OFFSET RF_IN Offset Voltage Level
2
3
V
V_RET
RF_IN Retro-modulation Level
120
mV
Note: 1. Note:Data specified in the table above are estimated or target values. All values can be updated during product qualification.
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