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參數(shù)資料
| 型號： | NCN8024RDWR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SMART CARD IC2 28SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | * |
NCN8024R
http://onsemi.com
12
Figure 6. Deactivation Sequence
CRD_RST
CRD_IO
CRD_CLK
CMDVCC
CRD_VCC
tdeact
FAULT DETECTION
In order to protect both the interface and the external smart
card, the NCN8024R provides security features to prevent
failures or damages as depicted here after.
Card extraction detection
VDD under voltage detection
Shortcircuit or overload on CRD_VCC
Card pin current limitation: in the case of a short circuit
to ground. No feedback is provided to the external MPU.
LDO operation: the internal circuit continuously senses
the CRD_VCC voltage (in the case of either over or
under voltage situation).
LDO operation: undervoltage detection on VDDP or
overload on VUP
Overheating
Card pin current limitation: in the case of a short circuit
to ground. No feedback is provided to the external
MPU
Figure 7. Fault Detection and Interrupt Management
Debounce
Powerdown Caused by
ShortCircuit
Powerdown Resulting of
Card Extraction
INT
CRD_VCC
CRD_PRES
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 turns back 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 6).
When the microcontroller resets CMDVCC to High it can
sense the INT level again after having got completed the
deactivation.
As illustrated by Figure 7 the device has a debounce timer
of 8 ms typical duration. When a card is inserted, output INT
goes High only at the end of the debounce time. When the
card is removed a deactivation sequence is automatically
and immediately performed and INT goes Low.
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