MAX11080/MAX11081
12-Channel, High-Voltage
Battery-Pack Fault Monitors
22 ______________________________________________________________________________________
CONDITION EFFECT DESIGN RECOMMENDATION
PCB or IC package open or short
circuit—no stack load
Refer to the pin-level FMEA analysis
spreadsheet available from the factory
The b ui l t- i n featur es of the
M AX 11080/M AX 11081, shoul d ensur e l ow FM E A
r i sk i n m ost cases.
Random connection of cells to IC—
no stack load
No effect
The series resistors on the cell inputs of the
M AX 11080/M AX 11081, as well as the internal
design, ensure protection against random
power-supply or ground connections.
Random connection of modules—
no stack load
No effect
E ach m od ul e i s r efer enced to i ts nei g hb or , so no
sp eci al connecti on or d er i s necessar y.
Random connect/disconnect of
communication bus—no stack load;
AC- or DC-coupled
Communication from host to the first
break in the daisy-chain bus
The level-shifted interface design of the
M AX 11080/M AX 11081 ensures that the SHDN,
GND
U
, and ALRM_ communication bus can be
connected at any time with no load.
Random connect/disconnect of
communication bus—with stack load;
AC- or DC-coupled
Communication from host to the first
break in the daisy-chain bus
The level-shifted interface design of the
M AX 11080/M AX 11081 ensures that the SHDN,
GND
U
, ALRM_ communication bus can be
connected at any time as long as the power
bus is properly connected.
Connect/disconnect module
interconnect (bus bar)—no stack load
No effect for DC- or AC-coupled
communication bus
A break in the power bus does not cause a
problem as long as there is no load on the
stack.
Removal/fault of module interconnect
(bus bar)—with stack load
No effect for AC-coupled
communication bus; device damage for
DC-coupled bus
An AC-coupled bus with isolation on the SHDN
pin or a redundant bus-bar connection should
be used to protect against this case.
Removal/fault of module interconnect
(bus bar)—with stack under charge
No effect for AC-coupled
communication bus; device damage for
DC-coupled bus
An AC-coupled bus with isolation on the SHDN
pin or a redundant bus-bar connection should
be used to protect against this case.
Table 3. System Fault Modes