3.3.6. Stack Bus
The Stack Bus connector accepts power and provides a communication channel from the Power
Interface. The Stack Bus provides 42mA to the SC plus the summation of current consumed by all
Cell Interface modules in the system (25mA per CI-12 or 31mA per CI-16). 120
Ω
termination
must be added by connecting pins 1 and 3 together with a short length of wire.
Connect the Power Interface module to this connector.
Table 11. Stack Bus: Molex MiniFit Jr Connector
Molex 39-01-2065
Manufacturer
Molex Incorporated
Housing
39-01-2065
Housing material
Nylon UL94V-0
Circuits
6
Crimp terminal
39-00-0181
Wire gauge range
AWG20-24 stranded
Table 12. Stack Bus Connector Pin Assignment
Pin
Connection
Description
Connected to Device
1
TERM1
Termination Resistor; Short to Pin 4 to
add 120
Ω
bus termination
Stack Bus Connector
2
STACKBUS_N
Stack bus differential pair negative
Power Interface
3
+VSYS
+24V Power Supply
Power Interface
4
TERM2
Termination Resistor; Short to Pin 1 to
add 120
Ω
bus termination
Stack Bus Connector
5
STACKBUS_P
Stack bus differential pair positive
Power Interface
6
COM
Power return from SC
Power Interface
Installation Guide - 2018-10-08, Rev. 2.0
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