TDA8034T(2010) Ver la hoja de datos (PDF) - NXP Semiconductors.

Número de pieza

componentes Descripción

Fabricante

TDA8034T
(Rev.:2010)

Smart card interface

NXP Semiconductors. 

NXP Semiconductors

TDA8034T; TDA8034AT

Smart card interface

PRESN

OFFN

CMDVCCN

tdeb

tdeb

VCC

(1)

(1) Deactivation caused by card withdrawal.

(2) Deactivation caused by short-circuit.

Fig 9. Operation of debounce feature with pins OFFN, CMDVCCN, PRESN and VCC

(2)

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8.10 Automatic determining of card supply voltage

The supply voltage (VCC) that the card requires is determined automatically by monitoring

the duration of the HIGH state (logic 1) on pin CMDVCCN before the activation command

(CMDVCCN falling edge) occurs. If pin CMDVCCN stays HIGH for more than 30 ms,

activation occurs with VCC set to 5 V. If pin CMDVCCN stays HIGH for less than 15 ms,

activation occurs with VCC set to 3 V.

To activate the card at VCC = 5 V, pin CMDVCCN must stay HIGH for t0 > 30 ms before

going LOW (logic 0).

CMDVCCN

t0

3 V or 5 V

VCC

5V

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Fig 10. Card activation, VCC = 5 V, t0 > 30 ms

To activate the card at VCC = 3 V, pin CMDVCCN must stay HIGH for t0 < 15 ms before

going LOW (logic 0).

CMDVCCN

t0

3 V or 5 V

VCC

3V

001aak999

Fig 11. Card activation, VCC = 3 V, t0 < 15 ms

If pin CMDVCCN is HIGH for more than 15 ms (t0 > 15 ms) but less than 30 ms, pin

CMDVCCN must be set LOW for t1 (200 μs < t1 < 700 μs), and then HIGH for t2

(200 μs < t2 < 15 ms) before going LOW.

TDA8034T_TDA8034AT

Product data sheet

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

Rev. 2.0. — 12 November 2010

© NXP B.V. 2010. All rights reserved.

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