ncn6000 ON Semiconductor, ncn6000 Datasheet - Page 30

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

Table 6. Interrupt Functions
Input Schmitt Triggers
circuits to prevent the NCN6000 against uncontrolled
operation. The typical dynamic characteristics of the related
pins are depicted in Figure 33.
voltage is above 0.70*Vbat, and will go Low when the input
voltage is below 0.30*Vbat.
Interrupt Function
by one of the here below referenced operations.
NCN6000 internal behavior. It is up to the engineering to
decide when and how the interrupt will be cleared from this
pin. As described before, this can be achieved by either
Card Insertion and
DC−DC Converter
All the Logic Input pins have built−in Schmitt trigger
The output signal is guaranteed to go High when the input
The NCN6000 flags the external microprocessor by pulling down the INT signal provided in pin 9. This signal is activated
Leaving the INT pin Low has no influence on the
Extraction
Overloaded
Pin Related
11
15
Figure 33. Typical Schmitt Trigger Characteristic
OFF
V
ON
bat
Output
Positive Going Chip Select, or logical
combination of Chip Select Low and
PWR_ON Positive Going
Positive Going Chip Select, or logical
combination of Chip Select Low and
PWR_ON Positive Going
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NCN6000
Clear Function
30
bandwidth clock receiver input, capable to drive the internal
clock divider. This front end circuit yields a constant Duty
Cycle signal, according to the ISO specification, to the
external smart card, even when the NCN6000 division ratio
is 1:1.
providing a Chip Select positive transient, or by starting the
DC−DC converter with the standard command PWR_ON =
H and CS =L.
The CLOCK_IN pin has been design to provide a 40 MHz
V
bat
High = Card Presents
Low = No Card Inserted
High = DC−DC Operates Normally
Low = Output CRD_VCC Overloaded
Input
STATUS Pin 5