APPENDIX E Receiver Card Interface Examples
OEM7 Installation and Operation User Manual v4
218
E.4 CAN Controller Ports
OEM7 receivers provide 3.3 V CMOS-level CAN controller ports. An external CAN transceiver is
required. The following figure shows a typical CAN transceiver implementation.
The combination of ferrite beads and small-value capacitors are not necessarily required but
may provide improved EMI performance. A low-capacitance TVS device is shown on the schem-
atic to provide ESD protection.
Figure 60: OEM7 CAN Transceiver Example
OEM719
OEM729
OEM7700
OEM7720
Connector
P1701
1
P1803
P2001
P1901
CAN1TX
7
10
36
36
CAN1RX
6
11
38
38
CAN2TX
20
12
37
37
CAN2RX
8
13
35
35
Table 50: CAN Transceiver Pin Designation
The 120Ω termination resistor should only be used when the CAN device is used at one end of
the CAN bus. Multiple terminations along the length of the CAN bus will degrade performance for
all CAN devices on that bus.
The slew rate adjustment resistor (R2) value shown sets the slew rate for applications for SAE
J1939 agricultural applications. Other applications may require a different slew rate. Refer to
the transceiver data sheet for more information.
Designator
Manufacturer
Manufacturer Part Number
FB1, FB2
TDK
MMZ1005B800C
U1
Texas Instruments
SN65HVD231QD
U2
Bourns
CDNBS08-PLC03-6
Table 51: CAN Transceiver Example Bill of Materials (crit-
ical components)
1
Pins 6 and 7 are multiplexed with other signals and may not be available when certain features are enabled. See
P1701 Main Connector 20-Pin Header
on page 142 for more information.
Содержание OEM719
Страница 1: ...OM 20000168 v4 February 2018 OEM7 Installation and Operation User Manual...
Страница 123: ...Chapter 8 NovAtel Firmware and Software OEM7 Installation and Operation User Manual v4 123...
Страница 130: ...APPENDIX A OEM719 Technical Specifications OEM7 Installation and Operation User Manual v4 130 Figure 43 OEM719 Keep outs...
Страница 150: ...APPENDIX B OEM729 Technical Specifications OEM7 Installation and Operation User Manual v4 150 Figure 50 OEM729 Keep outs...
Страница 235: ...OEM7 Installation and Operation User Manual v4 235...