TDA8006HSLASHC2 datasheet(11/40 Pages) PHILIPS

11 / 40 page

2000 Feb 21

Philips Semiconductors

Product speciﬁcation

Multiprotocol IC Card coupler

TDA8006

Table 3

Other register byte addresses

Supply

The circuit operates within a supply voltage range of

4.2 to 6 V. The supply pins are VDD, VDDA, GND, AGND,

VDDRAM and GNDRAM. Pins VDDA and AGND supply the

card analog drivers and have to be externally decoupled

because of the large current spikes that the card and the

step-up converter can create. VDDRAM and GNDRAM

supply the auxiliary RAM and should be decoupled

separately. VDD and GND supply the rest of the chip.

An integrated spike killer ensures the contacts to the card

remain inactive during power-up or power-down.

An internally generated voltage reference is used by the

step-up converter, the voltage supervisor and the VCC

generator.

If VDD is too low to ensure proper operation, the voltage

supervisor generates an alarm pulse, whose length is

defined by an external capacitor tied to the CDELAY pin,

(1 ms per 1 nF typical). This pulse is used to reset the

controller and is used in parallel with an external reset

input which can come from the system controller. It is also

used to either block any spurious on-card contacts during

a controller reset or to force an automatic deactivation of

the contacts in the event of supply drop-out (see

Sections “Activation sequence” and “Deactivation

sequence”). It is also fed to an external open-drain output

(called ALARM) which can be chosen active HIGH or LOW

by mask option (see Table 12).

Step-up converter

Except for the VCC generator and the other card contact

buffers, the whole circuit is powered by VDD, VDDA and

VDDRAM. If the supply voltage is 4.2 V, then a higher

voltage is needed for the supply to the ISO contacts. When

a card session is requested by the controller, the

sequencer first starts the step-up converter. This uses

switched capacitors which are clocked at a frequency of

approximately 2.5 MHz by an internal oscillator.

The output voltage VUP is regulated at approximately 6 V

and then fed to the VCC generator. VCC and GND are used

as a reference for all other card contacts.

BYTE

ADDRESS

(HEX)

BIT RESET

VALUE

0000 0111

DPL

0000 0000

DPH

0000 0000

PCON

0000 0000

TMOD

0000 0000

TL0

0000 0000

TL1

0000 0000

TH0

0000 0000

TH1

0000 0000

S0BUF

XXXX XXXX

RCAP2L

0000 0000

RCAP2H

0000 0000

TL2

0000 0000

TH2

0000 0000

handbook, full pagewidth

MGR228

Vth(VDD)

VDD

Vth(CDELAY)

CDELAY

ALARM

Fig.4 Voltage supervisor.

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