ncn6000 ON Semiconductor, ncn6000 Datasheet - Page 15

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

Basic Operating Modes Flow Chart
data communication between a host computer and the smart
card. The built−in Chip Select pin provides a simple way to
share the same MPU bus with several card interface. On top
of that, the logic control are derived from specific pins,
avoiding the risk of mixing up the operation when the
interface is controlled by a low end microcontroller.
care of whatever is necessary to he data on the single
Standby Mode
insertion, keeping the power consumption at a minimum.
The power supply CRD_VCC is not applied to the card, until
the external controllers set PWR_ON = H with CS = L.
Standby Mode
Logic Conditions:
CS
PWR_ON = H
A0
A1
PGM
I/O
RESET
The NCN6000 brings all the functions necessary to handle
During the transaction operation, the external MPU takes
The Standby Mode allows the NCN6000 to detect a card
= H
= Z
= Z
= Z
= Z
= Z
Card Output:
CRD_VCC = 0 V
CRD_CLK = L
CRD_RST = L
CRD_IO
FINISH
= L
LATCH NCN6000
PROGRAMMING
PARAMETERS
PARAMETERS
SET NCN6000
Figure 7. Operating Modes Flow Chart
PGM = H
CS = H
MODE
CS = H
PGM = L
CS = L
SELECT OPERATING MODE
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STAND BY MODE
NCN6000
Vbat = OK
CS = H
PGM = H
RESET
POWER DOWN SEQUENCE
END MODE
15
SEND ATR SEQUENCE
TRANSACTION MODE
PGM = H
CS = L
bidirectional I/O line. Leaving aside the DC−DC control and
associated failures, the NCN6000 does not take any further
responsibility in the data transaction.
NCN6000 provide a flexible access to set up the CRD_VCC
voltage, the CRD_CLK and the CRD_DET smart card
signals.
transaction and shall handle the interface accordingly.
present pin 11, then asserts the INT pin to Low if the pulse
applied to CRD_DET is longer than 150 ms. The external
MPU shall run whatever is necessary to handle the card.
transition is asserted to either the CS or to the PWR_ON
signal logically combined with Chip Select = Low.
ACTIVE MODE
When the chip operates in the programming mode, the
The external microcontroller takes care of the smart card
When a card is inserted, the internal logic filters the signal
The INT is cleared (return to High) when a positive going
PWR_ON = H
IDLE MODE