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參數(shù)資料
| 型號： | NCN8025MTTBG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SMART CARD I2C 16-QFN |
| 標準包裝： | 1 |
| 系列： | * |
| 其它名稱： | NCN8025MTTBGOSDKR |
NCN8025 / NCN8025A
http://onsemi.com
12
POWERDOWN
When the communication session is completed the
NCN8025 / NCN8025A runs a deactivation sequence by
setting High CMDVCC. The below power down sequence
is executed:
CRST is forced to Low
CCLK is set Low 12
ms after CRST.
CI/O, CAUX1 and CAUX2 are pulled Low
Finally CVCC supply can be shutoff.
CRST
CVCC
CIO
CCLK
Figure 7. Deactivation Sequence
CMDVCC
Tdeact
FAULT DETECTION
In order to protect both the interface and the external smart
card, the NCN8025 / NCN8025A provides security features
to prevent failures or damages as depicted here after.
Card extraction detection
VDD under voltage detection
Shortcircuit or overload on CVCC
DC/DC operation: the internal circuit continuously
senses the CVCC voltage (in the case of either over or
under voltage situation).
DC/DC operation: undervoltage detection on VDDP
Overheating
Card pin current limitation: in the case of a short circuit
to ground. No feedback is provided to the external
MPU.
PRES
CVCC
/INT
debounce
Powerdown resulting
of card extraction
Powerdown caused
by shortcircuit
Figure 8. Fault Detection and Interrupt Management
CMDVCC
Interrupt Pin Management:
A card session is opened by toggling CMDVCC High to
Low.
Before a card session, CMDVCC is supposed to be in a
High position. INT is Low if no card is present in the card
connector (Normally open or normally closed type). INT is
High if a card is present. If a card is inserted (INT = High)
and if VDD drops below the UVLO threshold then INT pin
drops Low immediately. It switches High when VDD
increases again over the UVLO limit (including hysteresis),
a card being still present.
During a card session, CMDVCC is Low and INT pin
goes Low when a fault is detected. In that case a deactivation
is immediately and automatically performed (see Figure 7).
When the microcontroller resets CMDVCC to High it can
sense the INT level again after having got completed the
deactivation.
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