TDA8034AT 查看數據表（PDF） - NXP Semiconductors.

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TDA8034AT

Smart card interface

NXP Semiconductors. 

NXP Semiconductors

TDA8034T; TDA8034AT

Smart card interface

[5] Uses an internal 20 k pull-up resistor connected to pin VDD(INTF).

[6] Uses an internal 10 k pull-up resistor connected to pin VDD(INTF).

8. Functional description

Remark: Throughout this document the ISO 7816 terminology conventions have been

adhered to and it is assumed that the reader is familiar with these.

8.1 Power supplies

The power supply voltage ranges are as follows:

• VDDP: 4.85 V to 5.5 V

• VDD: 2.7 V to 3.6 V

VDD should rise prior to VDDP or at the same time. VDDP should not rise before VDD.

All interface signals to the system controller are referenced to VDD(INTF). All card contacts

remain inactive during power up or power down. After powering up the device, pin OFFN

remains LOW until pin CMDVCCN is set HIGH and pin PRESN is LOW. During power

down, pin OFFN goes LOW when VDDP falls below the falling threshold voltage (Vth).

The internal oscillator frequency (fosc(int)) is only used during the activation sequences.

When the card is not activated (pin CMDVCCN is HIGH), the internal oscillator is in low

frequency mode to reduce power consumption.

This device has a Low Drop-Off (LDO) voltage regulator connected to pin VCC, and is

used instead of a DC-to-DC converter. It ensures a minimum VCC of 4.75 V and that the

power supply voltage on pin VDDP does not fall below 4.85 V for a maximum load current

of 65 mA.

TDA8034T_TDA8034AT

Product data sheet

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

Rev. 3.1 — 13 December 2012

© NXP B.V. 2012. All rights reserved.

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