6.2 Hardware Modification Guidelines

For users who wish to modify the reference design, we offer guidelines below for what to expect in the modification process.

6.2.1 Alternate Footprint Parts

• Alternate type reed switch SW-1 + support circuitry.

• U7 is a SOT23 footprint for hall-effect sensor.

6.2.2 Avoid Modificaton

All changes listed here may have serious impacts on performance:

• Modifying the spacing between the U0 EM3587 and the U1 balun.

• Changing the PCB antenna length/shape.

• Changing any part of the ground pour area.

6.2.3 Bill of Material Cost-Saving Options

To further reduce overall bill-of-material (BOM) cost of this contact sensor, the following items and their supporting circuitry can be con-

sidered for removal:

• J3 programming header.

• U3 external flash.

• U5 Si7053 temperature sensor.

Hardware

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