Dual-Row Headers; Figure 7. Dual-Row Headers With Shorts - Cirrus Logic CDB5378 Manual

Single-channel seismic evaluation system

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CDB5378

2.5.4

Dual-row Headers

To simplify signal tracing on CDB5378, all device pins connect to dual-row headers. These dual-row head-

ers are not populated during board manufacture, but the empty PCB footprint exists on the boards and

can be used as test points.

The dual-row header pins are shorted on the bottom side of the PCB to pass signals through to the rest

of the board. These shorted traces between the dual-row pins can be carefully cut to isolate the device

signals from the rest of the PCB to permit wiring changes to the existing route. To restore the previous

connection, install a jumper to short across the dual-row pins.

Signals taken off the PCB should not be wired directly from the dual-row header pins, as there is no clean

path for the signal return current. Instead, install a connector into the prototying area and wire the signal

and a ground connection to it. Pairing the signal with a ground return before taking it off the PCB will im-

prove signal integrity.

DS639DB4

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