TDA8006HSLASHC2 datasheet(25/40 Pages) PHILIPS

25 / 40 page

2000 Feb 21

Philips Semiconductors

Product speciﬁcation

Multiprotocol IC Card coupler

TDA8006

Deactivation sequence

When the session has completed, the microcontroller sets

CMDVCC LOW (t10). The circuit then executes an

automatic deactivation sequence:

• Card reset (RST goes LOW) (t11)

• Clock is stopped (t12)

• I/O goes LOW (t13)

• VCC falls to 0 V with typically 0.16 V/µs slew rate (t14)

• The step-up converter is stopped and CLK, RST, VCC

and I/O become low impedance to GND (t15).

t11 =t10 + 1⁄64T, t12 =t11 + 1⁄2T, t13 =t11 +T,

t14 =t11 + 3⁄2T, t15 =t11 + 5T.

tde is the time that VCC requires to fall to less than 0.3 V.

handbook, full pagewidth

MGR237

CMDVCC

RST

I/O

VCC

CLK

VUP

t10

t11

t12

t13

t14

t15

tde

Fig.13 Deactivation sequence.

Protection

The main hardware fault conditions monitored by the

circuit are:

• Overcurrent on VCC

• Short circuits between VCC and other contacts

• Card take-off during transaction.

When one of these problems is detected, the security logic

block sets the OFF bit LOW which generates an interrupt

warning the microcontroller and initiates an automatic

deactivation of the contacts.

When the deactivation has completed and CMDVCC has

been set LOW, the OFF bit goes HIGH, unless the problem

was caused by a card extraction, in which case it remains

LOW until a card is inserted.

TDA8006H/C2 Datasheet(PDF) 25 Page - NXP Semiconductors

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