CM2904 Instruction Book © 2009 - 2022 Parker-Hannifin Corporation Page 18 of 51
Hardware Specifications
Communication Mediums - CAN
I
NFORMATION
Inductive loads will create an average current flow that moves out of the high side
output. When the output is on, the current flows through the output driver, and
when the output is off, the current flows through the flyback diode. A duty cycle of
50% will produce the worst case average current flow through these two devices.
5.3.2. Reference Outputs
There is two sensor supply / reference outputs in CM2904:
+5V
and
+8V
Table 9:
Specifications for Sensor 5V
Element
Min
Nom
Max
Unit
Count
1
Output voltage
4,975
5
5,025
V
Output current
200
mA
Resolution (feedback)
*)
NOTE
Table 10: Specifications for Sensor 8V
Element
Min
Nom
Max
Unit
Count
1
Output voltage
7,95
8
8,05
V
Output current
50
mA
Resolution (feedback)
*)
NOTE
2
%
Diagnostics and protection Diagnosable, protected against short circuit and battery.
N
OTICE
Current feedback resolution based on feedback circuitry’s component tolerance –
Sensor supplies feedback circuitries tolerance is typically 1 %
5.4. Communication Mediums - CAN
The CM2904 has following communication features:
•
2 x extended CAN interfaces:
•
1
st
CAN is wired to microcontroller
•
2
nd
CAN implemented by using separate controller chip: MPC2515
•
CAN 2.0B. Communication according to SAE J1939/71 communication layer
•
Bit rate 250 kbps
•
Overvoltage protection implemented by using 30V bi-directional TVS
