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

Table 3. Pin description …continued

Symbol

Pin

Type Description

XTAL2

25

O crystal connection (leave open-circuit if external clock

source is used)

I/OUC

AUX1UC

AUX2UC

26

I/O host data I/O line; integrated 11 k pull-up resistor to VDD

27

I/O auxiliary data line to/from the host; integrated 11 k pull-up

28

I/O resistor to VDD

[1] The noise margin on VCC will be higher with the 220 nF capacitor.

8. Functional description

Throughout this document it is assumed that the reader is familiar with ISO7816

terminology.

8.1 Power supply

The supply pins for the IC are VDD and GND. VDD should be in the range of 2.7 V to 6.5 V.

All signals interfacing with the system controller are referred to VDD, therefore VDD should

also supply the system controller. All card reader contacts remain inactive during

power-on or power-off.

The internal circuits are maintained in the reset state until VDD reaches Vth2 + Vhys2 and for

the duration of the internal Power-on reset pulse, tW (see Figure 5). When VDD falls below

Vth2, an automatic deactivation of the contacts is performed.

A DC-to-DC converter is incorporated to generate the 5 V or 3 V card supply voltage

(VCC). The DC-to-DC converter should be supplied separately by VDDP and PGND. Due to

the possibility of large transient currents, the two 100 nF capacitors of the DC-to-DC

converter should be located as near as possible to the IC and have an ESR less than

100 m.

The DC-to-DC converter functions as a voltage doubler or a voltage follower according to

the respective values of VCC and VDDP (both have thresholds with a hysteresis of

100 mV).

The DC-to-DC converter function changes as follows.

• VCC = 5 V and VDDP > 5.8 V; voltage follower

• VCC = 5 V and VDDP < 5.7 V; voltage doubler

• VCC = 3 V and VDDP > 4.1 V; voltage follower

• VCC = 3 V and VDDP < 4.0 V; voltage doubler.

Supply voltages VDD and VDDP may be applied to the IC in any sequence.

After powering the device, OFF remains LOW until CMDVCC is set HIGH.

During power off, OFF falls LOW when VDD is below the falling threshold voltage.

TDA8024

Product data sheet

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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