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TDA8034T Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA8034T Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 29 page TDA8034T_TDA8034AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 2.0. — 12 November 2010 11 of 29 NXP Semiconductors TDA8034T; TDA8034AT Smart card interface • In card sessions, pin CMDVCCN is LOW: when pin OFFN goes LOW, the fault detection circuit triggers the automatic emergency deactivation sequence (see Figure 8). When the microcontroller resets pin CMDVCCN to HIGH, after the deactivation sequence, pin OFFN is rechecked. If the card is still present, pin OFFN returns to HIGH. This check identifies the fault as either a hardware problem or a card removal incident. On card insertion or removal, bouncing can occur in the PRESN signal. This depends on the type of card presence switch in the connector (normally open or normally closed) and the mechanical characteristics of the switch. To correct for this, a debouncing feature is integrated in to the TDA8034T/TDA8034AT. This feature operates at a typical duration of 4.5 ms (tdeb = 640 × (1∨fosc(int)low). Figure 9 on page 12 shows the operation of the debouncing feature. On card insertion, pin OFFN goes HIGH after the debounce time has elapsed. When the card is extracted, the automatic card deactivation sequence is performed on the first HIGH/LOW transition on pin PRESN. After this, pin OFFN goes LOW. Fig 8. Emergency deactivation sequence after card removal 001aai971 OFFN PRESN CLK I/O VCC XTAL OSCINT t10 t12 tdeact t13 t14 RST low frequency high frequency |
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