ncn6000 ON Semiconductor, ncn6000 Datasheet - Page 20

• Manufacturer Part Number: ncn6000
• Description: Compact Smart Card Interface Ic
• Manufacturer: ON Semiconductor

generates an interrupt, assuming the positive pulse width is
longer than the digital filter. The oscillogram, Figure 12,
depicts the behavior for a Normally Open switch.
positive going Chip Select signal as depicted by the
oscillogram, Figure 13. The CS pulse width is irrelevant, as
long as it is larger than 2.0 ms, to activate a different
sequence. Leaving the interrupt signal Low has no influence
When the card is extracted, the CRD_DET signal
The interrupt signal, provided pin 9, is cleared by a
Figure 13. Interrupt Acknowledgement During a Card Insertion Detection Sequence
Figure 12. Card Extraction Detection and Interrupt Signals
INTERRUPT
CRD_DET Input Voltage (card inserted)
Chip Select Acknowledge or Clear Interrupt
Digital Filter Delay
CRD_DET Input Voltage (card extracted)
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NCN6000
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(500 kW typical), one must use a 10 MW input impedance
probe to read this signal.
on the internal behavior of the NCN6000, but will be
automatically cleared when the DC−DC will be activated by
the MPU (CS=L, PWR_ON = Positive High transition)
Note: since the internal pull up resistor is relatively high
Chip Select
INTERRUPT