Texas Instruments ADS1224EVM, Руководство пользователя

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I/O Connectors and Testpoints
2-2
2.1 I/O Connectors and Testpoints
The positions and functions of the connectors and testpoints are shown in
Figure 2−1.
Figure 2−1.
Connectors and Jumpers
ANALOG
CONNECTOR
SERIAL
CONNECTOR
J1
J2
JUMPER
BLOCK
POWER
CONNECTOR
J4
J3
Many of the pins on the connectors are not used. On the pinout diagrams, un-
used pins are not marked. In the pin description tables, unused pins are not
listed, and ground pins are listed together, with the exception of the power
connector.
J1, J2, and J3, although each treated as a single connector, are actually
mounted as connector pairs in a pass-through configuration. Each pair has a
surface-mount header on the top (component) side of the board, and a corre-
sponding surface-mount socket on the bottom (solder) side of the board. Vias
in the pads connect each pin from top to bottom. The headers, mounted on top,
are suffixed A; the sockets, mounted on bottom, are suffixed B.
In the schematic, the connector pairs are shown as one symbol. For J1, J2, and
J3, all bottom-side pins are connected to their corresponding top-side pins; for
example, J1B pin 1 connects to J1A pin 1, J1B pin 2 connects to J1A pin 2, etc.
This convention holds true for every pin on connectors J1, J2, and J3.
In the following descriptions, the connector pairs will be referred to as a single
connector.