11.1.2 Card Interface Layout Recommendations
The card interface layout is important for proper operation of the device and for meeting EMV4.3 electrical requirements:
- If possible two 100 nF capacitors should be connected to VCC. One near the TCA5013 and one close to the card slot.
- If only one 200 nF capacitor is used it should be placed close to the TCA5013.
- If possible the CLK trace should be routed on a separate signal layer different from the layer on which the other card interface traces (IO and RST) are routed. It is also recommended that the two signal layers be separated by a ground plane if possible.
- The GNDS, GNDUC and GND pins should be connected to the ground plane with the shortest trace possible to reduce inductance from the device ground to the ground plane. This is critical in order for the device to meet the 8 kV IEC protection level on the card interface pins.