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 schematic to provide ESD protection.

OEM7 CAN Transceiver Example

CAN Transceiver Pin Designation

 

OEM719

OEM729

OEM7600

OEM7700

OEM7720

Connector

P17011Pins 6 and 7 are multiplexed with other signals and may not be available when certain features are enabled. See OEM719 Interface Connector for more information.

P1803

P1701

P2001

P1901

CAN1TX

7

10

36

36

36

CAN1RX

6

11

38

38

38

CAN2TX

20

12

37

37

37

CAN2RX

8

13

35

35

35

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.

CAN Transceiver Example Bill of Materials (critical components)

Designator

Manufacturer

Manufacturer Part Number

FB1, FB2

TDK

MMZ1005B800C

U1

Texas Instruments

SN65HVD231QD

U2

Bourns

CDNBS08-PLC03-6

 

OM-20000167 v12

July 2019

Email comments to NovAtel_TPUBS@NovAtel.com

7.07.01 / OM7MR0701RN0000
PP7 07.07.00 / EP7PR0700RN0000
7.06.02 / OA7CR0602RN0000