Annex B. Aba-Tk2 Interface - Promag Mifare DESFire DF7 Series User Manual

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ANNEX B. ABA-TK2 Interface

The timing for card present, clock (strobe) and data, example as below:
/CARD PRESENT
/DATA
/STROBE
(CLOCK)
DATA
The data signal is valid while the clock is low. If the Data signal is high, the bit
is a zero. If the Data signal is low, the bit is a one.
CLOCK (STROBE)
The Clock signal indicates when Data is valid. It is recommended that Data be loaded
by the user with the leading edge (negative) of the Strobe.
CARD PRESENT
Card Present will go low after flux reversals from the Reader. Card Present will return
high after the last flux reversal.
Connect the ABA TK2 wires, example as below:
Reader
Optional: External LED/Buzzer Control (Brown)
Leading Zero
0 0 0 . . . 0 1
STROBE Width Approximately 25~50% Of Bit Time
Bit Time 40IPS (min:280us, typ:330us, max:480us)
7.5~24VDC
(Red)
Card Present (Orange)
Clock (White)
Data (Green)
(Black)
GND
Data
1 0 1 0 0 1 . . .
HOST/Terminal
GND
41
DF7XX
REV.E
Trailing Zero
0 0 0