F2F Magnetic Stripe Encoding Card Reader
Mar 31, 2008
The M56710FP is a semiconductor integrated circuit of Bi-CMOS structure having an F2F demodulator function for
magnetic card reader.
• Low current dissipation (0.7 mA when on standby as a standard)
• Provided with glance-over selection input (4, 8, and 16 bits)
• Provided with output polarity (“L” active or “H” active) switching input
• Miniature mini-mold package
• Wide operating temperature range Ta = −20 to 75°C
Magnetic card reader
Data signal which is read from magnetic card via magnetic head is input from HD2 and HD1 pins., and converted into
F2F pattern signal by analog processing in amplifier OP1, differentiator OP2, sensitivity setting circuit and waveform
shaping circuit. If F2F signal is input, the logic section glances over the prescribed number of bits set by IB1 and IB2
input before performing digital processing, and then outputs card reading signal CLS, read clock signal RCP, and read
data signal RDT. INV turning to “L” switches each output of CLS. RCP and RDT from “L” active to “H” active.
• Standard Bits:
Let the number of glance-over bits set by IB1 and IB2 be M.
Let the Mth FC (flux change) through M+1st FC after LDI input is turned from “L” to “H” be a standard bit with a
time width of TB0.
I/O is discriminated from the next bit to this standard bit as a data bit.
• I/O discrimination
Let the data bit time width of a data bit be TBn, and if there is one next FC between the FC at the end of that bit (i.e.
the beginning of the next bit) to 5/7TBn, let the next bit (Bn+1) be data “1”, and, if there is no FC, be data “0”.
• Output signal time width
When letting the oscillation cycle of oscillation circuit be TOSC.
RCP output pulse width TOW: about 16 TOSC
RCP delay time to RDT: about 8 TOSC
REJ03F0175-0201 Rev.2.01 Mar 31, 2008
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