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MAX66140E-000AA+
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
MAX66140
ISO 15693-Compliant Secur
e Memor
y
_______________________________________________________________________________________
9
Figure 9. Downlink SOF for “1 Out of 256” Coding (Carrier Not Shown)
~ 9.44
μ
s
~ 37.76
μ
s
~ 37.76
μ
s
~ 9.44
μ
s
Figure 8. Downlink Data Coding (Case “1 Out of 4,” Carrier Not Shown)
PULSE POSITION "00"
PULSE POSITION "01" (1 = LSB)
PULSE POSITION "10" (0 = LSB)
PULSE POSITION "11"
~ 9.44
μ
s
~ 9.44
μ
s
~ 9.44
μ
s
~ 9.44
μ
s
~ 9.44
μ
s
~ 75.52
μ
s
~ 75.52
μ
s
~ 75.52
μ
s
~ 75.52
μ
s
~ 66.08
μ
s
~ 28.32
μ
s
~ 47.20
μ
s
first half of the bit transmission time, switching to the
lower subcarrier for the second half. See Figure 13 for
details. The transmission of the SOF pattern takes the
same time as transmitting 4 bits (approximately 151µs
at a high data rate or approximately 604µs at a low data
rate). The SOF is distinct from any 4-bit data sequence.
The EOF pattern is equivalent to a SOF being transmit-
ted backwards. The exact duration of the SOF and EOF
varies slightly depending on the use of one or two sub-
carriers (Figures 14 and 15, respectively).
ABRIDGED DA
T
A
SHEET
MAX66140
ISO 15693-Compliant Secur
e Memor
y
10
______________________________________________________________________________________
ABRIDGED DA
T
A
SHEET
Figure 10. Downlink SOF for “1 Out of 4” Coding (Carrier Not Shown)
~ 9.44
μ
s
~ 37.76
μ
s
~ 37.76
μ
s
~ 9.44
μ
s
~ 9.44
μ
s
Figure 11. Downlink EOF (Identical for Both Coding Schemes, Carrier Not Shown)
~ 9.44
μ
s
~ 37.76
μ
s
~ 9.44
μ
s
Figure 12. Uplink Coding, Single Subcarrier Case (High Data-Rate Timing)
TRANSMITTING A ZERO
423.75kHz, ~ 18.88
μ
s
~ 18.88
μ
s
~ 37.76
μ
s
TRANSMITTING A ONE
423.75kHz, ~ 18.88
μ
s
~ 18.88
μ
s
~ 37.76
μ
s
MAX66140
Figure 13. Uplink Coding, Two Subcarriers Case (High Data-Rate Timing)
TRANSMITTING A ZERO
484.28kHz, ~ 18.58
μ
s
423.75kHz, ~ 18.88
μ
s
~ 37.46
μ
s
TRANSMITTING A ONE
484.28kHz, ~ 18.58
μ
s
423.75kHz, ~ 18.88
μ
s
~ 37.46
μ
s
Figure 14. Uplink SOF, Single Subcarrier Case (High Data-Rate Timing)
423.75kHz
423.75kHz
~ 56.64
μ
s
~ 56.64
μ
s
~ 37.76
μ
s
Figure 15. Uplink SOF, Two Subcarriers Case (High Data-Rate Timing)
423.75kHz
423.75kHz
484.28kHz
484.28kHz
~ 55.75
μ
s
~ 56.64
μ
s
~ 37.46
μ
s
ISO 15693-Compliant Secur
e Memor
y
______________________________________________________________________________________
11
ABRIDGED DA
T
A
SHEET
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
MAX66140E-000AA+
Mfr. #:
Buy MAX66140E-000AA+
Manufacturer:
Maxim Integrated
Description:
RFID TAG R/W 13.56MHZ CARD
Lifecycle:
New from this manufacturer.
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