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3.3.16 CAN Interface
CAN DB9 connector CN26
Pin
Signal
Pin
Signal
1
N.C.
6
GND
2
CAN_L
7
CAN_H
3
GND
8
N.C.
4
N.C.
9
CAN_VDD
5
GND
CAN_VDD: Power output for CAN Bus line. Please check JP10 description.
JP11 position
120Ω CAN Termination
Not Inserted
Termination disconnected
Inserted
Termination present
It could also be possible to use the CAN interface directly at TTL level, i.e. using the signals that come out directly from Qseven
CAN TTL pin header - CN25
Pin
Signal
Pin
Signal
1
CAN_VDD
2
CAN0_RX (*)
3
N.C.
4
CAN0_TX (*)
5
GND
6
+3.3V_S
7
N.C.
8
GND
GND
10
N.C.
JP10 position
CAN_VDD Voltage
1-2
+12V_S
2-3
+5V_S
CQ7-A30
CQ7-A30 - Rev. First Edition: 1.0 - Last Edition: 2.0 - Author: S.B. - Reviewed by G.G. Copyright © 2016 SECO S.r.l.
®
According to Qseven
specifications, the modules can optionally offer a CAN
interface, since many architectures offer this kind of interface natively.
For this reason, on CQ7-A30 carrier board there is a CAN transceiver, which allows
the system to be interfaced directly to any CAN Network.
The interface is available on the lower DB9 male of the CN26 combo connector (the
upper one is dedicated to the COM coming from the Qseven
3.3.15)
CAN_H: High Level CAN Bus line
CAN_L: Low level CAN Bus line
CAN interface can optionally be terminated with a 120Ω Resistor, in case CQ7-A30 carrier is at one of the
extremities of the CAN line. To enable this termination, is necessary to use jumper JP6, which is a standard
pin header, P2.54mm, 1x2 pin, according to the table on the left.
The related signals are carried out an internal 10-pin standard male pin header (CN32), p
2.54 mm, 10 pin, dual row, h= 6mm, with the pinout shown in the table on the left.
CAN0_TX: CAN Transmit Output for CAN Bus Channel.
CAN0_RX: CAN Receive Input for CAN Bus Channel.
(*) As a factory default, these signals are not connected on this connector, since they are used to drive the
CAN transceiver which manages the CN26 connector. If it is necessary to use CAN at TTL level on CN25,
instead of using the CAN interface on CN26, then it is possible to reconnect CAN0_RX and CAN0_TX on
CN25, leaving CN26 not working. Please contact SECO for information on this rework.
CAN_VDD: Power output for CAN Bus line (also available on connector CN26). The power rail that
has to be used to supply the CAN Bus line can be selected by using jumper JP10, which is a
standard pin header, P2.54mm, 1x3 pin.
®
module, see par.
®
card edge connector.
56
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