MAX11080 datasheet(25/27 Pages) MAXIM

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12-Channel, High-Voltage Battery-Pack

Fault Monitor

______________________________________________________________________________________

NUMBER

NAME

ACTION

EFFECT

Open (or Disconnected)

The pin defaults to low due to the internal pulldown (see Note 7). The effect

depends on the intended overvoltage setting.

OVSEL0

Short to Pin 21

• If pin 20 and pin 21 have the same intended value, there is no effect for the

short.

• If pin 20 and pin 21 have a different setting, the VAA is shorted to AGND.

ALRML goes low.

Open (or Disconnected)

The pin defaults to low due to the internal pulldown (see Note 7). The effect

depends on the intended overvoltage setting.

OVSEL1

Short to Pin 22

• If pin 21 and pin 22 have the same intended value, there is no effect for the

short.

• If pin 21 and pin 22 have a different setting, the VAA is shorted to AGND.

ALRML goes low.

Open (or Disconnected)

The pin defaults to low due to the internal pulldown (see Note 7). The effect

depends on the intended overvoltage setting.

OVSEL2

Short to Pin 23

• If pin 22 and pin 23 have the same intended value, there is no effect for the

short.

• If pin 22 and pin 23 have a different setting, the VAA is shorted to AGND.

ALRML goes low.

Open (or Disconnected)

The pin defaults to low due to the internal pulldown (see Note 7). The effect

depends on the intended overvoltage setting.

OVSEL3

Short to Pin 24

• If pin 23 is set high, there is no effect for the short.

• If pin 23 is set low, the VAA is shorted to AGND. ALRML goes low.

Open (or Disconnected)

ALRML goes high.

VAA

Short to Pin 25

ALRML goes low.

Open (or Disconnected)

VAA goes to approximately 100mV and ALRML is approximately 0.5V. There is

no heartbeat if there is a one before the opening.

AGND

Short to Pin 26

The device is in shutdown mode. ALRML is low.

Open (or Disconnected)

The pin is internally pulled down and the device goes to the shutdown mode.

ALRML is low.

SHDN

Short to Pin 27

ALRML goes high and stays high even if the short is removed. The internal

detect circuit considers this a major failure and the part has to be repowered

up to come out of this state.

Open (or Disconnected)

The signal at the ALRML cannot be seen by the host.

ALRML

Short to Pin 28

ALRML goes high and stays high even if the short is removed. The internal

detect circuit considers this a major failure and the part has to be repowered

up to come out of this state.

Open (or Disconnected)

The delay between the fault condition and alarm setting (ALRML goes high)

goes to the minimum. This means there is almost no delay.

Short to Pin 29

The delay between the fault condition and alarm setting (ALRML goes high) is

approximately 4s, which is set by the internal watchdog.

Table 4. FEMA Analysis (Note 5) (continued)

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