MAX66100K-000AA+【PDF 4/16 页】IC RFID UID 64BIT TYPE B KEY FOB

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ISO 15693-Compliant 64-Bit UID

distinct from any 2-bit pattern. The position of the sec-

ond notch tells whether the frame uses the “1 out of

256” or “1 out of 4” coding scheme (Figures 8 and 9,

respectively). The transmission of the EOF pattern

takes 37.76μs; the EOF is the same for both coding

schemes and has one modulation notch (Figure 10).

The path from slave to master uses one or two subcar-

riers, as specified by the Subcarrier_flag bit in the

request data packet. The standard defines two data

rates for the response, low (approximately 6600bps)

CARRIER

AMPLITUDE

100%

t

Figure 5. Downlink Modulation (e.g., Approximately 100%

Amplitude Modulation)

PULSE-

MODULATED

CARRIER

and high (approximately 26,500bps). The Data_rate_flag

bit in the request data packet specifies the response

data rate. The data rate varies slightly depending on the

use of one or two subcarriers. The LSb is transmitted

first. A compliant device must support both subcarrier

modes and data rates.

In the single subcarrier case, the subcarrier frequency

is 423.75kHz. One bit is transmitted in 37.76μs (high

data rate) or 151μs (low data rate). The modulation is

the on/off key. For a logic 0, the subcarrier is on during

the first half of the bit transmission time and off for the

second half. For a logic 1, the subcarrier is off during

the first half of the bit transmission time and on for the

second half. See Figure 11 for more details.

In the two subcarrier cases, the subcarrier frequencies

are 423.75kHz and 484.28kHz. The bit duration is the

same as in the single subcarrier case. The modulation

is equivalent to binary FM. For a logic 0, the lower sub-

carrier is on during the first half of the bit transmission

time, switching to the higher subcarrier for the second

half. For a logic 1, the higher subcarrier is on during the

first half of the bit transmission time, switching to the

lower subcarrier for the second half. See Figure 12 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 (see Figures 13 and 14, respectively).

~ 9.44 μ s

~ 18.88 μ s

0 1 2 3 4

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2

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2 2 2 2

Figure 6. Downlink Data Coding (Case “1 Out of 256”)

2

5

~ 4.833ms

5 5 5 5

2 3 4 5

4

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