TDA8029HLSLASHC2 datasheet(43/58 Pages) PHILIPS

43 / 58 page

2003 Oct 30

Philips Semiconductors

Product speciﬁcation

Low power single card reader

TDA8029

8.11

Supply

The circuit operates within a supply voltage range of

2.7 to 6 V. The supply pins are VDD, DCIN, GND and

PGND. Pins DCIN and PGND supply the analog drivers to

the cards and have to be externally decoupled because of

the large current spikes the card and the step-up converter

can create. VDD and GND supply the rest of the chip.

An integrated spike killer ensures the contacts to the card

to remain inactive during power-up or -down. An internal

voltage reference is generated which is used within the

step-up converter, the voltage supervisor, and the VCC

generators.

VDCIN may be higher than VDD.

The voltage supervisor generates an alarm pulse, whose

length is defined by an external capacitor connected to the

CDEL pin, when VDD is too low to ensure proper operation

(1 ms per 2 nF typical). This pulse is used as a Power-on

reset pulse, and also to block either any spurious signals

on card contacts during controllers reset or to force an

automatic deactivation of the contacts in the event of

supply drop-out (see Sections 8.16 and 8.17).

After power-on or after a voltage drop, the bit SUPL is set

within the Hardware Status Register (HSR) and remains

set until HSR is read when the alarm pulse is inactive.

As long as the Power-on reset is active, INT0_N is LOW.

The same occurs when leaving shut-down mode or when

the RESET pin has been set active.

handbook, full pagewidthVth1

VDD

Vth2

CDEL

RSTOUT

SUPL

INT

Supply dropout

Power-off

Reset by CDEL

Power-on

Status read

MDB815

Fig.11 Voltage supervisor.

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