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LAN35MH08HR & LAN35ME08HR User’s Manual
CN19 pin functions are described as follows:
CN19 Pin
Function
Description
1
USB VCC
USB input power (+5V)
3
USB-
Negative half of USB differential pair
5
USB+
Positive half of USB differential pair
7, 9
GND
Ground connection
2, 4, 6, 8, 10
n/a
No Connect
Table 10: CN19 Signal Descriptions
NOTE: The LAN35Mx08 is a USB device, not a host. If you are building your
own cable to interface to CN19 to a standard USB connector, be sure
to select an appropriate device-side connector, such as USB Type-B
female or Mini-B female.
3.3.5
CN23,
P
OWER
I
NPUT
(LAN35MH08HR
ONLY
)
CN23 is a power connector to allow the use of the LAN35MH08HR as a standalone device without a CPU or power supply board. The
LAN35MH08HR only re5V and ground, however if +12V is supplied it will be provided to the PCIe/104 bus connectors. CN23 is only
available on the host version of the board. CN23 may be used to power just a single LAN35MH08HR, or it may be used to power a stack of
multiple RTD StackNET boards (e.g. one LAN35MH08HR plus several LAN35ME08HR boards). Additional power input options are any of
RTD
’s
PCIe/104 or PCI/104-Express power supplies
CN23 is a 12-pin SIL connector
with 0.1” pin spacing.
Pin 1 is indicated by a square solder pad. The pinout is described in the table below.
Pin 12 Pin 11 Pin 10 Pin 9 Pin 8 Pin 7 Pin 6 Pin 5 Pin 4 Pin 3 Pin 2
Pin 1
Figure 9: CN23 Pin Numbering
CN23 pin functions are described as follows:
Pin
Function
1
Ground
2
+5V
3
+5V
4
Ground
5
Ground
6
+12V
7
+12V
8
Ground
9
Ground
10
+5V
11
+5V
12
Ground
Table 11: CN23 Signal Descriptions
If the stack is to powered from CN23, care must be taken to ensure good power connections. The power and ground leads must be twisted
together, or as close together as possible to reduce lead inductance. A separate lead must be used for each of the power pins. All +5V pins,
and all ground pins must be connected. If +12V is required for other boards in the stack, then +12V must be connected as well. Do not use
wire smaller than 20 gauge, and take care to ensure the length of the wire does not exceed 2 ft. The power supply solution must be verified by
measuring voltage at CN23 and verifying that it meets the input voltage specifications defined in Chapter 2. The voltage at the connector
should be checked with an oscilloscope while the system is operational.