UM0672

Printed-circuit board references

7/15

1.2

Printed-circuit board references of a standard solution for

CRX14/CR14

Figure 5 and Figure 6 show the top and bottom layers of the PCB, respectively. Figure 7

provides the circuit and Table 2 gives the bill of materials.

Figure 5.

Top layer of second PCB

CRX14

U1

SO-16

ST card read coupler (type-B)

PZT2222

Q2

SOT-223

NPN transistor

WURTH 742-792-042

FL3

805

WURTH 742-792-042

FL4

805

WURTH 742-792-042

FL5

805

WURTH 742-792-042

FL1

805

WURTH 742-792-042

FL2

805

option

R7

603

Resistor

Table 1.

Bill of materials for first PCB (continued)

Designator

Part type

Footprint

Description