MAX11080IUU+T Datasheet MAX11080IUU+, MAX11080IUU+T, MAX11081IUU+ | P22-P24

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

, 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

, 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

MAX11080/MAX11081

NUMBER

NAME ACTION EFFECT

Open (or Disconnected) ALRM

goes high (see Note 7).

1 DCIN

Short to Pin 2 ALRM

goes high.

Open (or Disconnected) ALRM

goes high.

2HV

Short to Pin 3 No effect.

Open (or Disconnected) No effect.

3N.C.

Short to Pin 4 No effect.

Open (or Disconnected)

• If open occurs before power-up, the part works as if C12 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C12 to C11 is disabled and is

not enabled even if the pin is reconnected.

• If open occurs after power-up, it is considered a zero voltage input. ALRM

goes high when the undervoltage is enabled.

4 C12

Short to Pin 5

• If short occurs before power-up, the part works as if C12 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C12 to C11 is disabled and is

not enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C12 to C11. ALRM

goes high when the undervoltage is enabled.

Open (or Disconnected)

ALRM

goes high because it causes an overvoltage to the affected input pair

even if the overvoltage is set to the maximum.

5 C11

Short to Pin 6

• If short occurs before power-up, the part works as if C11 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C11 to C10 is disabled and is

not enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C11 to C10. ALRM

goes high when the undervoltage is enabled.

Open (or Disconnected)

ALRM

goes high as it causes an overvoltage to the affected input pair even if

the overvoltage is set to the maximum.

6 C10

Short to Pin 7

• If short occurs before power-up, the part works as if C10 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C10 to C9 is disabled and is

not enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C10 to C9. ALRM

goes high when the undervoltage is enabled.

Open (or Disconnected)

ALRM

goes high as it causes an overvoltage to the affected input pair even if

the overvoltage is set to the maximum.

7C9

Short to Pin 8

• If short occurs before power-up, the part works as if C9 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C9 to C8 is disabled and is not

enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C9 to C8. ALRM

goes high when the undervoltage is enabled.

Table 4. FMEA Analysis (Note 6)

12-Channel, High-Voltage

Battery-Pack Fault Monitors

______________________________________________________________________________________ 23

MAX11080/MAX11081

12-Channel, High-Voltage

Battery-Pack Fault Monitors

24 ______________________________________________________________________________________

NUMBER

NAME ACTION EFFECT

Open (or Disconnected)

ALRM

goes high as it causes an overvoltage to the affected input pair even if

the overvoltage is set to the maximum.

8C8

Short to Pin 9

• If short occurs before power-up, the part works as if C8 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C8 to C7 is disabled and is not

enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C8 to C7. ALRM

goes high when the undervoltage is enabled.

Open (or Disconnected)

ALRM

goes high as it causes an overvoltage to the affected input pair even if

the overvoltage is set to the maximum.

9C7

Short to Pin 10

• If short occurs before power-up, the part works as if C7 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C7 to C6 is disabled and is not

enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C7 to C6. ALRM

goes high when the undervoltage is enabled.

Open (or Disconnected)

ALRM

goes high as it causes an overvoltage to the affected input pair even if

the overvoltage is set to the maximum.

10 C6

Short to Pin 11

• If short occurs before power-up, the part works as if C6 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C6 to C5 is disabled and is not

enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C6 to C5. ALRM

goes high when the undervoltage is enabled.

Open (or Disconnected)

ALRM

goes high as it causes an overvoltage to the affected input pair even if

the overvoltage is set to the maximum.

11 C5

Short to Pin 12

• If short occurs before power-up, the part works as if C5 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C5 to C4 is disabled and is not

enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C5 to C4. ALRM

goes high when the undervoltage is enabled.

Open (or Disconnected)

ALRM

goes high as it causes an overvoltage to the affected input pair even if

the overvoltage is set to the maximum.

12 C4

Short to Pin 13

• If short occurs before power-up, the part works as if C4 does not exist

because the internal circuit detects the situation and assumes it is what the

application intended to do. The monitoring of C4 to C3 is disabled and is not

enabled even if the short is removed.

• If short occurs after power-up, the situation is treated as a zero voltage input

for C4 to C3. ALRM

goes high when the undervoltage is enabled.

Table 4. FMEA Analysis (Note 6) (continued)

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P29

MAX11080IUU+T

Mfr. #:

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Manufacturer:

Maxim Integrated

Description:

Battery Management 12 Ch Hi Volt Batt Pack Fault Monitor

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MAX11080IUU+T

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