UM1607 datasheet(5/9 Pages) STMICROELECTRONICS

Numer części	UM1607

Szczegółowy opis	24-pin smartcard interface ST8034HC demonstration board

PDF	9 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

Logo

5 / 9 page

DocID024208 Rev 1

5/9

UM1607

Board layout

3.1

Layout recommendations

The ST8034xx family of devices includes an LDO block to generate VCC supply voltage for

the smartcard, which (in contrast to previous ST8024/8024L devices with a charge pump)

does not generate any noise and therefore even the requirements for a printed circuit board

layout and external component selection are not so strict (general PCB layout rules apply).

On the other hand, the LDO requires the input voltage (VDDP) to be at least about 100 mV

greater than the desired output voltage (VCC). Place the decoupling capacitors as close as

possible to the appropriate pin of the ST8034 device and use sufficiently wide PCB tracks.

Make the data and clock lines as short as possible and use a ground plane.

3.2

Component placement

Figure 3. Component placement on the PCB

UM1607 Arkusz danych(PDF) 5 Page - STMicroelectronics