MAX11080 Datasheet, PDF (25/27 Pages) Maxim Integrated Products – 12-Channel, High-Voltage Battery-Pack Fault Monitor

12-Channel, High-Voltage Battery-Pack
Fault Monitor
Table 4. FEMA Analysis (Note 5) (continued)
PIN
NUMBER
20
21
22
23
24
25
26
27
NAME
ACTION
EFFECT
OVSEL0
OVSEL1
OVSEL2
OVSEL3
V_AA
AGND
SHDN
ALRM_L
Open (or Disconnected)
The pin defaults to low due to the internal pulldown (see Note 7). The effect
depends on the intended overvoltage setting.
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 V_AA is shorted to AGND.
ALRM_L 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.
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 V_AA is shorted to AGND.
ALRM_L 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.
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 V_AA is shorted to AGND.
ALRM_L 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.
Short to Pin 24
Open (or Disconnected)
Short to Pin 25
Open (or Disconnected)
• If pin 23 is set high, there is no effect for the short.
• If pin 23 is set low, the V_AA is shorted to AGND. ALRM_L goes low.
ALRM_L goes high.
ALRM_L goes low.
V_AA goes to approximately 100mV and ALRM_L is approximately 0.5V. There is
no heartbeat if there is a one before the opening.
Short to Pin 26
Open (or Disconnected)
The device is in shutdown mode. ALRM_L is low.
The pin is internally pulled down and the device goes to the shutdown mode.
ALRM_L is low.
Short to Pin 27
ALRM_L 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 ALRM_L cannot be seen by the host.
Short to Pin 28
ALRM_L 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 (ALRM_L goes high)
goes to the minimum. This means there is almost no delay.
28
CD
Short to Pin 29
The delay between the fault condition and alarm setting (ALRM_L goes high) is
approximately 4s, which is set by the internal watchdog.
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