TDA8024T/C1 データシートの表示（PDF） - NXP Semiconductors.

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TDA8024T/C1

Standard smart card interface

NXP Semiconductors. 

NXP Semiconductors

TDA8024

Standard smart card interface

• CMDVCC LOW within a card session. Output OFF goes LOW when a fault

condition is detected. As soon as this occurs, an emergency deactivation is performed

automatically (see Figure 11). When the system controller resets CMDVCC to HIGH it

may sense the OFF level again after completing the deactivation sequence. This

distinguishes between a hardware problem or a card extraction (OFF goes HIGH

again if a card is present).

Depending on the type of card-present switch within the connector (normally-closed or

normally-open) and on the mechanical characteristics of the switch, bouncing may occur

on the PRES signals at card insertion or withdrawal.

There is a debounce feature in the device with an 8 ms typical duration (see Figure 10).

When a card is inserted, output OFF goes HIGH only at the end of the debounce time.

When the card is extracted, an automatic deactivation sequence of the card is performed

on the first true/false transition on PRES or PRES and output OFF goes LOW.

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See “Application note AN10141” for software decision algorithm on OFF signal.

Fig 10. Behavior of OFF, CMDVCC, PRES and VCC.

TDA8024

Product data sheet

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Fig 11. Emergency deactivation sequence (card extraction)

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All information provided in this document is subject to legal disclaimers.

Rev. 4.0 — 3 June 2016

© NXP Semiconductors N.V. 2016. All rights reserved.

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