Table of Contents
Advertisement
3.2.3 CAN Termination and Connector
This circuit is shown for reference. Only a few components are fitted to the standard product.
The R6 & R7 0Ω links are fitted, this allows the footprint of L1 (a common mode choke) to be
•
bypassed.
R10 & R11 are a 120Ω (124Ω) CAN termination pair. These are 1206 package resistors to give
•
a reasonable power rating margin (combined rating needs at least 0.2W), 0805 resistors are not
large enough.
JP2, this allows R10 and R11 to be linked across the CAN differential pair, this does not require
•
solder links to be applied.
D1, this is an ESD TVS protection diode, this is intended to protect the CAN transceiver circuit
•
from static discharge voltages.
C8, C12-C14, L1, R1-R4 are not fitted.
•
The isolated side of IC1 (ISO1050) is powered from the isolated DC to DC converter DC1 (Nets 'VCC' &
'GND1'), this is a 5V rail as the ISO1050 is not compatible with 3.3V logic on its CAN bus I/O.
The power rail decoupling capacitor C1 is located close to the device.
Note that this circuit group is all referenced to ground GND1. This group is isolated from the rest of the
board.
By request the circuit may also be fitted with a custom set of components, or alternatively these can be
fitted by the customer: (Note however that if this is done by the customer we do not support the
warranty).
Figure 5 - CAN Termination and Connector
01/06/2018
Document Number
IEMAN000001
Document Title
CAN Interface pHAT User Manual
10 of 22
Document Revision
Page
R003
10 of 22
Advertisement
Table of Contents
