P440 Data Sheet / User Guide
DRAFT
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Finally, the physical interface for the Chassis Ground is through the designated mounting screw hole
shown in
Figure 14
. (For additional details, see
Section 4.3
–
Powering and Grounding the Unit
).
4.1 Connecting to the P440
The user can connect to the P440 in a number of different ways. For example, it is possible to:
Connect directly to the USB or Ethernet connectors
Build a special purpose cable and connect through the locking connector
Mount the P440 on a carrier board and communicate through one or more mezzanine
connectors
The following are examples of the electrical connections:
Option 1: USB.
The user can connect to the board via the USB Data jack (J5) and power
the unit through the USB Power jack (J13).
Option 2: Ethernet.
The user can connect to the P440 via the Ethernet RJ45 jack and then
power the unit through the USB Power jack (J13). Details on how the Ethernet IP address is
assigned can be found in
Section 4.4.5 – Ethernet and IP Addressing
.
Option 3: Locking Connector
. The user can use the locking connector to connect via SPI,
User Serial, or CAN. This connector also provides power and ground. Details on the
pinouts for the locking connector and the part number for mating connector are provided in
the following section.
Option 4: User Mezzanine Connector.
The User Mezzanine connector supports SPI, User
Serial, and CAN. It also provides power and ground. See the following section for details.
Option 5: Ethernet Mezzanine Connector
. This connector provides power, ground, and all
of the Ethernet MAC signal lines necessary to communicate with the unit. However this
requires that the user provide an Ethernet PHY chip on a carrier board.
Several of these connection approaches offer access to the GPIO pins. See the following section for
details.
4.2 Connector Pinouts
The pinouts of the various connectors are shown in
Figures 15a, 15b, 15c, 15d,
and
15e.
The
numbering convention that defines pin numbers with connector pins is shown on
Figures 15f
and
15g.
All signal lines are provided with Electrostatic Discharge (ESD) protection (+/- 8 kV contact
discharge and +/-15 kV air-gap discharge). The signal line voltage levels are 3.3 Vdc, 1.8 Vdc, or (in
the case of CAN) are differential. These inputs are not tolerant to other voltages. Overdriving these
lines with too large a voltage or requiring them to source too much current will cause damage to the
P440. Please take care to avoid damage. Not only will this compromise or damage the performance
of the system but this class of damage is not covered by warranty.
Some of the mezzanine connector pins are marked as “Reserved.” The function of these pins may
change with time. If the user intends to mount the P440 on a carrier board, then it is advisable to
connect any pin marked “Reserved” to a landing point but to NOT connect the landing point to any
other trace on the carrier board.
The part numbers of all of the connectors and their mates can be found in
Section 5 – Mechanicals.
