Philips TDA8004T-C1 Datasheet

DATA SH EET

Product speciﬁcation Supersedes data of 1997 Nov 21 File under Integrated Circuits, IC02

1999 Dec 30

INTEGRATED CIRCUITS

TDA8004T

IC card interface

1999 Dec 30 2

Philips Semiconductors Product speciﬁcation

IC card interface TDA8004T

FEATURES

• 3 or 5 V supply for the IC (GND and VDD)

• Step-up converter for VCC generation (separately

powered with a 5 V ±10% supply, V

DDP

and PGND)

• 3 specific protected half duplex bidirectional buffered I/O lines (C4, C7 and C8)

• VCC regulation 5 V ±5% on 2 × 100 nF or 1 × 100 nF and 1 × 220 nF multilayer ceramic capacitors with low ESR, ICC< 65 mA at 4.5 V < V

DDP

< 6.5 V, current spikes of 40 nAs up to 20 MHz, withcontrolled rise and fall times, filtered overload detection approximately 90 mA)

• Thermal and short-circuit protections on all card contacts

• Automatic activation and deactivation sequences (initiated by software or by hardware in the event of a short-circuit, card take-off, overheating or supply drop-out)

• Enhanced ESD protection on card side (>6 kV)

• 26 MHz integrated crystal oscillator

• Clock generation for the card up to 20 MHz (divided by

1, 2, 4 or 8 through CLKDIV1 and CLKDIV2 signals)

• Non-inverted control of RST via pin RSTIN

• ISO 7816, GSM11.11 and EMV (payment systems)

compatibility

• Supply supervisor for spikes killing during power-on and power-off

• One multiplexed status signal OFF.

APPLICATIONS

• IC card readers for banking

• Electronic payment

• Identification

• Pay TV.

GENERAL DESCRIPTION

The TDA8004T is a complete low cost analog interface for asynchronous smart cards. It can be placed betw the card andthe microcontroller with very few external components to perform all supply protection and control functions.

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA8004T SO28 plastic small outline package; 28 leads; body width 7.5 mm SOT136-1

1999 Dec 30 3

Philips Semiconductors Product speciﬁcation

IC card interface TDA8004T

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

supply voltage 2.7 − 6.5 V

DDP

step-up supply voltage 4.5 5 6.5 V

supply current inactive mode; VDD= 3.3 V;

XTAL

=10MHz

−−1.2 mA

active mode; V

= 3.3 V;

XTAL

= 10 MHz; no load

−−1.5 mA

DDP

step-up supply current inactive mode; V

DDP

=5V;

XTAL

=10MHz

−−0.1 mA

active mode; V

DDP

=5V;

XTAL

= 10 MHz; no load

−−18 mA

Card supply

card supply voltage including ripple

DC ICC < 65 mA 4.75 − 5.25 V AC current spikes of 40 nAs 4.65 − 5.25 V

i(ripple)(p-p)

ripple voltage on V

(peak-to-peak value)

20 kHz ≤f 200 MHz −−350 mV

I

 card supply current VCC from 0 to 5 V −−65 mA

General

CLK

card clock frequency 0 − 20 MHz

deactivation cycle duration 60 80 100 µs

tot

continuous total power dissipation T

amb

= −25 to +85 °C −−0.56 W

amb

ambient temperature −25 − +85 °C

1999 Dec 30 4

Philips Semiconductors Product speciﬁcation

IC card interface TDA8004T

BLOCK DIAGRAM

handbook, full pagewidth

MGM175

100 nF

100

I/O

TRANSCEIVER

I/O

TRANSCEIVER

I/O

TRANSCEIVER

THERMAL

PROTECTION

GENERATOR

RST

BUFFER

CLOCK

BUFFER

SEQUENCER

CLOCK

CIRCUITRY

OSCILLATOR

HORSEQ

INTERNAL OSCILLATOR

2.5 MHz

STEP-UP CONVERTER

INTERNAL

REFERENCE

VOLTAGE SENSE

SUPPLY

EN2

EN5

EN4

EN3

CLK

EN1 CLKUP

ALARM

ref

DDP

S1 S2

VUP

PGND

RST

CGND

PRES

CLK

AUX1

AUX2

I/O

18 n.c.

GND

I/OUC

AUX2UC

AUX1UC

XTAL2

XTAL1

CLKDIV2

CLKDIV1

RFU1

CMDVCC

RSTIN

OFF

TDA8004T

Fig.1 Block diagram.

All capacitors are mandatory.

1999 Dec 30 5

Philips Semiconductors Product speciﬁcation

IC card interface TDA8004T

PINNING

SYMBOL PIN I/O DESCRIPTION

CLKDIV1 1 I control with CLKDIV2 for choosing CLK frequency CLKDIV2 2 I control with CLKDIV1 for choosing CLK frequency RFU1 3 I reserved for future use (to be connected to V

or microcontroller I/O; active HIGH) PGND 4 supply power ground for step-up converter S2 5 I/O capacitance connection for step-up converter (a 100 nF capacitor with ESR < 100 mΩ

must be connected between pins S1 and S2)

DDP

6 supply power supply voltage for step-up converter

S1 7 I/O capacitance connection for step-up converter (a 100 nF capacitor with ESR < 100 mΩ

must be connected between pins S1 and S2)

VUP 8 I/O output of step-up converter (a 100 nF capacitor with ESR < 100 mΩ must be

connected to PGND)

PRES 9 I card presence contact input (active LOW); if PRES orPRES is true, then the card is

considered as present

PRES 10 I card presence contact input (active HIGH); if PRES or

PRES is true, then the card is

considered as present

I/O 11 I/O data line to and from card (C7) (internal 10 kΩ pull-up resistor connected to V

)

AUX2 12 I/O auxiliary line to and from card (C8) (internal 10 kΩ pull-up resistor connected to V

)

AUX1 13 I/O auxiliary line to and from card (C4) (internal 10 kΩ pull-up resistor connected to V

) CGND 14 supply ground for card signals CLK 15 O clock to card (C3) RST 16 O card reset (C2) V

17 O Supply for card (C1); decouple to CGND with 2 × 100 nF or 1 × 100 nF and 1 × 220 nF

capacitors with ESR < 100 mΩ (with 220 nF, the noise margin on VCC will be higher). n.c. 18 − not connected CMDVCC 19 I start activation sequence input from microcontroller (active LOW) RSTIN 20 I card reset input from microcontroller (active HIGH) V

21 supply supply voltage GND 22 supply ground OFF 23 O NMOS interrupt to microcontroller (active LOW) with 20 kΩ internal pull-up resistor

connected to VDD (refer section “Fault detection”) XTAL1 24 I crystal connection or input for external clock XTAL2 25 O crystal connection (leave open if an external clock source is used) I/OUC 26 I/O microcontroller data I/O line (internal 10 kΩ pull-up resistor connected to V

)

AUX1UC 27 I/O auxiliary line to and from microcontroller (internal 10 kΩ pull-up resistor connected to

)

AUX2UC 28 I/O auxiliary line to and from microcontroller (internal 10 kΩ pull-up resistor connected to

)

1999 Dec 30 6

Philips Semiconductors Product speciﬁcation

IC card interface TDA8004T

FUNCTIONAL DESCRIPTION

Throughout this document, it is assumed that the reader is familiar with ISO 7816 norm terminology.

Power supply

The supply pins for the IC are VDD and GND. VDD should be in the range from 2.7 to 6.5 V. All interface signals with the system controller are referenced to VDD; so, be sure the supply voltage of the system controller is also VDD. All card contacts remain inactive during powering up or powering down. The sequencer is not activated until V

reaches V

th2+Vhys(th2)

(see Fig.3). When VDDfalls below

th2

, an automatic deactivation of the contacts is

performed. For generating a 5 V ±5% VCC supply to the card, an

integrated voltage doubler is incorporated. This step-up converter should be separately supplied by V

DDP

and PGND (from 4.5 to 6.5 V). Due to large transient currents, the 2 × 100 nF capacitors of the step-up converter should have an ESR less than 100 mΩ and be located as near as possible to the IC.

The supply voltages VDD and V

DDP

may be applied to

the IC in any time sequence. If a voltage between 7 and 9 V is available within the

application, this voltage may be tied to pin VUP, thus blocking the step-up converter. In this case, V

DDP

must be tiedtoVDDandthecapacitorbetweenpinsS1 and S2may be omitted.

Voltage supervisor

This block surveys the VDD supply. A defined reset pulse of approximately 10 ms (tW) is used internally for maintainingthe IC in the inactive modeduringpoweringup or powering down of VDD (see Fig.3).

As long as VDD is less than V

th2+Vhys(th2)

, the IC will remaininactivewhateverthelevelsonthecommandlines. This also lasts for the duration of tWafter VDDhas reached a level higher than V

th2+Vhys(th2)

The system controller should not try to start an activation during this time.

When VDDfalls below V

th2

, a deactivation sequence of the

contacts is performed.

handbook, halfpage

CLKDIV1 CLKDIV2

RFU1

PGND

DDP

VUP

PRES PRES

I/O AUX2 AUX1

CGND

AUX2UC AUX1UC I/OUC XTAL2

OFF GND

XTAL1

RSTIN

CMDVCC n.c. V

RST CLK

1 2 3 4 5 6 7 8

9 10 11 12 13

28 27 26 25 24 23 22 21 20 19 18 17 16 1514

TDA8004T

MGM174

Fig.2 Pin configuration.

1999 Dec 30 7

Philips Semiconductors Product speciﬁcation

IC card interface TDA8004T

handbook, full pagewidth

MGM176

th2

+ V

hys(th2)

th2

ALARM

(internal signal)

Fig.3 ALARM as a function of VDD (tW= 10 ms).

Clock circuitry

The clock signal (CLK) to the card is either derived from a clock signal input on pin XTAL1 or from a crystal up to 26 MHz connected between pins XTAL1 and XTAL2.

The frequency may be chosen at f

XTAL

,1⁄2f

XTAL

,1⁄4f

XTAL

or1⁄8f

XTAL

via pins CLKDIV1 and

CLKDIV2. The frequency change is synchronous, which means that

during transition, no pulse is shorter than 45% of the smallest period and that the first and last clock pulse around the change has the correct width.

In the case of f

XTAL

, the duty factors are dependent on the

signal at XTAL1. In order to reach a 45% to 55% duty factor on pin CLK the

input signal on XTAL1 should have a duty factor of 48% to 52% and transition times of less than 5% of the input signal period.

If a crystal is used with f

XTAL

, the duty factor on pin CLK may be 45% to 55% depending on the layout and on the crystal characteristics and frequency.

Intheothercases,itisguaranteedbetween45% and 55% of the period.

Thecrystaloscillatorrunsassoon as the IC is powered up. If the crystal oscillator is used, or if the clock pulse on XTAL1 is permanent, then the clock pulse will be applied to the card according to the timing diagram of the activation sequence (see Fig.5).

If the signal applied to XTAL1 is controlled by the system controller, then the clock pulse will be applied to the card when the system controller will send it (after completion of the activation sequence).

Table 1 Clock circuitry deﬁnition

CLKDIV1 CLKDIV2 CLK

⁄

XTAL

⁄

XTAL

⁄

XTAL

10f

XTAL

1999 Dec 30 8

Philips Semiconductors Product speciﬁcation

IC card interface TDA8004T

I/O circuitry

The three data lines I/O, AUX1 and AUX2 are identical. The Idle state is realized by both lines (I/O and I/OUC)

being pulled HIGH via a 10 kΩ resistor (I/O to VCC and I/OUC to VDD).

I/O is referenced to VCC and I/OUC to VDD, thus allowing operation with VCC≠ VDD.

The first side on which a falling edge occurs becomes the master.Ananti-latchcircuitdisablesthe detection of falling edges on the other line, which becomes a slave.

After a time delay t

d(edge)

(approximately 200 ns), the N transistor on the slave side is turned on, thus transmitting the logic 0 present on the master side.

Whenthemastersidereturnstologic 1, the P transistor on theslavesideisturnedon during the time delayt

d(edge)

and

then both sides return to their Idle states. This active pull-up feature ensures fast LOW-to-HIGH

transitions; it is able to deliver more than 1 mA up to an output voltage of 0.9VCCon a 80 pF load. At the end of the active pull-up pulse, the output voltage only depends on the internal pull-up resistor and on the load current (see Fig.4).

The maximum frequency on these lines is 1 MHz.

Inactive state

Afterpower-onreset,the circuit enters the inactive state. A minimumnumber of circuits are active while waiting forthe microcontroller to start a session.

• All card contacts are inactive (approximately 200 Ω to GND)

• I/OUC, AUX1UC and AUX2UC are high impedance (10 kΩ pull-up resistor connected to VDD)

• Voltage generators are stopped

• XTAL oscillator is running

• Voltage supervisor is active.

Activation sequence

Afterpower-on and after the internal pulse width delay, the system controller may check the presence of the card with the signal OFF (OFF = HIGH while CMDVCC is HIGH means that the card is present; OFF = LOW while CMDVCC is HIGH means that no card is present).

If the card is in the reader (which is the case if PRES or PRES is true), the system controller may start a card session by pulling CMDVCC LOW.

The following sequence then occurs (see Fig.5):

• CMDVCC is pulled LOW (t0)

• The voltage doubler is started (t1~t0)

• VCC rises from 0 to 5 V with a controlled slope

(t2=t1+1⁄23T) (I/O, AUX1 and AUX2 follow VCC with a slight delay)

• I/O, AUX1 and AUX2 are enabled (t3=t1+ 4T)

• CLK is applied to the C3 contact (t4)

• RST is enabled (t5=t1+ 7T).

In the timing informations above and below, T is 64 times the period of the internal oscillator, about 25 µs.

The clock may be applied to the card in the following way:

• Set RSTIN HIGH before setting CMDVCC LOW and reset it LOW between t3and t5; CLK will start at this moment. RST will remain LOW until t5, where RST is enabledto be the copy of RSTIN. After t5,RSTIN has no further action on CLK. This is to allow a precise count of CLK pulses before toggling RST.

If this feature is not needed, then CMDVCC may be set LOWwithRSTINLOW.Inthiscase,CLKwillstart at t3and after t5,RSTINmaybesetHIGHinordertoget the Answer To Request (ATR) from the card.

handbook, halfpage

(2)

(1)

20 40

t (ns)

(V)

(mA)

FCE270

Fig.4 I/O, AUX1, and AUX2 output voltage and

current as a function of time during a LOW-to-HIGH transition.

(1) Current. (2) Voltage.

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