ncn6001 ON Semiconductor, ncn6001 Datasheet - Page 15

• Manufacturer Part Number: ncn6001
• Description: Compact Smart Card Interface Ic
• Manufacturer: ON Semiconductor

POWER DOWN SEQUENCE
sequence, according to the ISO7816−3 specifications, and
the communication session terminates immediately. The
sequence is launched when the card is extracted, or when the
CRD_VCC voltage is overloaded as described by the
ISO/CEI 7816−3 sequence depicted hereafter:
ISO7816−3 sequence:
100 ms (typical), assuming Cout = 10 mF.
"
The NCN6001 provides an automatic Power Down
The internal active pull down NMOS connected across CRD_VCC and GND discharges the external reservoir capacitor in
"
Force RST to Low
"
Force CLK to Low, unless it is already in this state
"
Force C4 & C8 to Low
"
Force CRD_IO to Low
Shut Off the CRD_VCC supply
Figure 6. Typical Power Down Sequence
Typical delay between each signal is 500 ns
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NCN6001
15
insertion or extraction, the physical power sequence will be
activated 50 ms (typical) after the card has been extracted. Of
course, such a delay does not exist when the MPU
intentionally launches the power down. Figure 6 shows the
oscillogram captured in the NCN6001 demo board.
CRD_VCC and GND discharges the external reservoir
capacitor in 100 ms (typical), assuming Cout = 10 mF.
Since the internal digital filter is activated for any card
The internal active pull down NMOS connected across