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3.2.3.12 CAN interface signals
Since i.MX6 processor includes a Flexible Controller Area Network (FlexCAN), the Q7-928 module can also offer a CAN interface.
This interface is compliant to CAN specifications rel. 2.0 part B.
CAN0_TX: CAN Transmit Output for CAN Bus Channel 0. +3.3V_S electrical voltage level signal.
CAN0_RX: CAN Receive Input for CAN Bus Channel 0. +3.3V_S electrical voltage level signal.
Please consider that it is not possible to connect Qseven
board.
The following schematic represents an example of such an implementation.
In the example provided, CAN Bus connection is made through a DB9 connector, with standard CAN pinout for such a connector, where also external battery
voltage is connected (+12V
batteries are considered as a referral for capacitor C1 sizing). 120Ω resistor is placed for line termination, in case that the system is
DC
placed to one of the two extremities of CAN Line. If this termination is required, simply plug a jumper in position J1.
U2
8
NC
1
CAN0_TX
D
4
CAN0_RX
R
5
NC
SN65HVD232D
3.2.3.13 Power Management signals
®
According to Qseven
specifications, on the golden edge finger connector there is a set of signals that are used to manage the power rails and power states.
The signals involved are:
PWGIN: Power Good Input, +5V_S tolerant active high signal. It must be driven on the carrier board to signal that power supply section is ready and stable. When
this signal is asserted, the module will begin the boot phase. The signal must be kept asserted for all the time that the module is working.
PWRBTN#: Power Button Input, active low +3.3V_A electrical voltage signal, with 10kΩ pull-up resistor. When working in ATX mode, this signal can be connected
to a momentary push-button: a pulse to GND of this signal will switch power supply On or Off.
RSTBTN#: Reset Button Input, active low +3.3V_S electrical voltage signal, with 10kΩ pull-up resistor. This signal can be connected to a momentary push-button:
Q7-928
Q7-928 User Manual - Rev. First Edition: 1.0 - Last Edition: 3.0 - Author: S.B. - Reviewed by P.Z Copyright © 2016 SECO S.r.l.
®
CAN interface to any CAN Bus directly, it is necessary to integrate a CAN Bus Transceiver in the Carrier
+3.3V_S
J1
3
JUMPER
VCC
7
CANH
6
R1
CANL
R-120
2
GND
P1
5
4
3
CAN_HI
2
CAN_LO
1
DB9 CONNECTOR
10
EXT_VBAT
9
8
C1
CC-4.7uF/25V
7
CAN_HI
6
11
37
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