TDA8029HLSLASHC2 datasheet(44/58 Pages) PHILIPS

44 / 58 page

2003 Oct 30

Philips Semiconductors

Product speciﬁcation

Low power single card reader

TDA8029

8.12

DC/DC converter

Except for VCC generator, and the other card contacts

buffers, the whole circuit is powered by VDD and DCIN.

If the supply voltage is 2.7 V, then a higher voltage is

needed for the ISO contacts supply. When a card session

is requested by the controller, the sequencer first starts the

DC/DC converter, which is a switched capacitors type,

clocked by an internal oscillator at a frequency of

approximately 2.5 MHz.

There are several possible situations:

• VDCIN = 3 V and VCC = 3 V: In this case the DC/DC

converter is acting as a doubler with a regulation of

about 4.0 V

• VDCIN = 3 V and VCC = 5 V: In this case the DC/DC

converter is acting as a tripler with a regulation of about

5.5 V

• VDCIN = 5 V and VCC = 3 V: In this case, the DC/DC

converter is acting as a follower, VDD is applied on VUP

• VDCIN = 5 V and VCC = 5 V. In this case, the DC/DC

converter is acting as a doubler with a regulation of

about 5.5 V

• VCC = 1.8 V. In this case, whatever value of VDCIN, the

DC/DC converter is acting as a follower, VDD is applied

on VUP.

The switch between different modes of the DC/DC

converter is done by the TDA8029 at about VDCIN = 3.5 V.

The output voltage is fed to the VCC generator. VCC and

GNDC are used as a reference for all other card contacts.

8.13

ISO 7816 security

The correct sequence during activation and deactivation of

the card is ensured through a specific sequencer, clocked

by a division ratio of the internal oscillator.

Activation (bit START = 1 in register PCR) is only possible

if the card is present (pin PRES is HIGH) and if the supply

voltage is correct (supervisor not active).

The presence of the card is signalled to the controller by

the HSR.

Bit PR1 in register MSR is set if the card is present. Bit

PRL1 in register HSR is set if PR1 has toggled.

During a session, the sequencer performs an automatic

emergency deactivation on the card in the event of card

take-off, short-circuit, supply dropout or overheating. The

card is also automatically deactivated in case of supply

voltage drop or overheating. The HSR register is updated

and the INT0_N line falls down, so the system controller is

aware of what happened.

8.14

Protections and limitations

The TDA8029 features the following protections and

limitations:

• ICC limited to 100 mA, and deactivation when this limit is

reached

• Current to or from pin RST limited to 20 mA, and

deactivation when this limit is reached

• Deactivation when the temperature of the die exceeds

150

°C

• Current to or from pin I/O limited to 10 mA

• Current to or from pin CLK limited to 70 mA

• ESD protection on all cards contacts and pin PRES at

minimum 6 kV, thus no need of extra components for

protecting against ESD flash caused by a charged card

being introduced in the slot

• Short circuit between any card contacts can have any

duration without any damage.

8.15

Power reduction modes

On top of the standard controller power reduction features

described in the microcontroller section, the TDA8029 has

several power reduction modes that allow its use in

portable equipment, and help protecting the environment:

• Shut-down mode: when SDWN_N pin is LOW, then the

bit SDWN within HSR will be set, causing an interrupt on

INT0_N. The TDA8029 will read the status, deactivate

the card if it was active, set all ports to logic 1 and enter

Power-down mode by setting bit PD in the controller’s

PCON register. In this mode, it will consume less than

µA, because the internal oscillator is stopped, and all

biasing currents are cut.

When SDWN_N returns to HIGH, a Power-on reset

operation is performed, so the chip is in the same state

than at power-on.

• Power-down mode: the microcontroller is in

Power-down mode, and the card is deactivated. The

bias currents in the chip and the frequency of the internal

oscillator are reduced. In this mode, the consumption is

less than 100

µA.

• Sleep mode: the microcontroller is in Power-down

mode, the card is activated, but with the clock stopped

HIGH or LOW. In this case, the card is supposed not to

draw more than 2 mA from VCC. The bias currents and

the frequency of the internal oscillator are also reduced.

With a current of 100

µA drawn by the card, the

consumption is less than 500

µA in tripler mode, 400 µA

in doubler mode, or 300

µA in follower mode.

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