Hello There,
At our system we are using some equipments that uses SN65HVD231QD, VP230 and TCAN1051VDRQ1. When we turn off the components that uses SN65HVD231QD and VP230 can bias voltages drops significantly.
At our system there is 4 equipment that uses VP230 and 1 component uses SN65HVD231QD. We replaced VP230 with SN65HVD231QD and saw that both of the ICs acts same. Here is some figures for different situations.
Test 1:
Only TCAN1051VDRQ1 connected to the system.
Test 2:
-TCAN1051VDRQ1 connected.
-VP230 connected but not powered.
Test 3:
-TCAN1051VDRQ1 connected.
- SN65HVD231QD connected but not powered.
As you can see from the test 2 and test 3 effects of the SN65HVD231QD and VP230 is quite similar.
More of these components will be connected to the system at the following figures.
Test 3:
-TCAN1051VDRQ1 connected.
-2 x VP230 connected but not powered.
Test 3:
-TCAN1051VDRQ1 connected.
-3 x VP230 connected but not powered.
Test 4:
-TCAN1051VDRQ1 connected.
-4 x VP230 connected but not powered.
Test 5:
-TCAN1051VDRQ1 connected.
-4 x VP230 connected but not powered.
- SN65HVD231QD connected but not powered.
As you can see from the figure above message nominal voltage level drops with after each connection (while they turned off)
And this is the situation when all of the components powered on
We are encountering some errors and even sometimes crashing at the CAN bus. Are behaviour of the ICs normal ? We can use some suggestions to make improvements at the CAN BUS.
Two 120 ohm resistors are used as terminations and cable quality is very good grade.
Kind Regards,
