TDA8024AT datasheet(23/29 Pages) PHILIPS

23 / 29 page

2004 July 12

Philips Semiconductors

Product speciﬁcation

IC card interface

TDA8024

handbook, full pagewidth

100 nF(1)

100 nF

(3)

(6)

(7)

AUX2UC

AUX1UC

I/OUC

XTAL2

XTAL1

OFF

GND

VDD

RSTIN

CMDVCC

PORADJ

VCC

RST

CLK

CLKDIV1

CLKDIV2

5V/3V

PGND

VDDP

VUP

PRES

I/O

AUX2

AUX1

CGND

TDA8024

CARD READ

(normally closed type)

+3.3 V

VDD

58.1 k

Ω

41.9 k

Ω

3.3 V POWERED

MICROCONTROLLER

33 pF

100 nF

100 nF(4)

220 nF(5)

+5 V

µF

100 k

Ω

MDB050

+3.3 V(2)

Fig.13 Application diagram.

(1) These capacitors must be of the low ESR-type and be placed near the IC (within 100 mm).

(2) TDA8024 and the microcontroller must use the same VDD supply.

(3) Make short, straight connections between CGND, C5 and the ground connection to the capacitor.

(4) Mount one low ESR-type 100 nF capacitor close to pin VCC.

(5) Mount one low ESR-type 100 or 220 nF capacitor close to C1 contact (less than 100 mm from it).

(6) The connection to C3 should be routed as far from C2, C7, C4 and C8 and, if possible, surrounded by grounded tracks.

(7) Optional resistor bridge for changing the threshold of VDD. If this bridge is not required pin 18 should be connected to ground; see Section 8.2.2.

Pin 18 is not connected in the TDA8024AT.

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