MAX11080 Datasheet, PDF (26/27 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
29
30
NAME
ACTION
EFFECT
AGND
AGND
Open (or Disconnected) No effect.
Short to Pin 30
No effect.
Open (or Disconnected) No effect.
Short to Pin 31
If pin TOPSEL is set high (V_AA), it causes the short between V_AA and AGND.
ALRM_L is low.
There is no effect if TOPSEL is set low.
If the part is the topmost device in the daisy chain, the ALRM_L is set high as
Open (or Disconnected) the state of TOPSEL is low (internally pulled down).
31
TOPSEL
There are no other effects as the state of the pin stays the same (both low).
No effect if TOPSEL is set low.
Short to Pin 32
If TOPSEL is set high, it causes the short between V_AA and AGND and ALRM_L
is low.
Open (or Disconnected) No effect.
32
AGND
Short to Pin 33
No effect.
Open (or Disconnected) No effect.
33
N.C.
Short to Pin 34
No effect.
ALRM_U is internally pulled up to VDD_U. There is no effect to the topmost
device. Otherwise, the communication of the chain is broken and the alarm
Open (or Disconnected) signal from the parts close to the topmost device are not passed through.
Since ALRM_L is a reflection of ALRM_U, the state of ALRM_L is high for the no-
34
ALRM_U
alarm state.
Short to Pin 35
No effect for the topmost device. Otherwise, the communication of the chain is
broken and the alarm signal from the parts close to the topmost are not
passed through. Since ALRM_L is a reflection of ALRM_U, the state of ALRM_L is
low for the no-alarm state.
35
GND_U ^{Open (or Disconnected) The ALRML goes high. VDDU floats down approximately 4V. (See Note 8.)}
Short to Pin 36
The ALRM_L is high. (See Note 8).
Open (or Disconnected) ALRM_L goes high. HV is approximately 0.4V below DCIN. (See Note 8.)
36
VDD_U
Short to Pin 37
ALRM_L goes high. VDD_U is approximately 0.5V lower than GND_U.
(See Note 8.)
Open (or Disconnected) ALRM_L goes high. VDD_U and HV collapse.
37
CP-
Short to Pin 38
ALRM_L goes high. VDD_U is approximately 0.5V lower than GND_U.
(See Note 8.)
38
CP+ Open (or Disconnected) ALRM_L goes high. VDD_U and HV collapse. (See Note 8.)
Note 5: If the cell voltage is within the monitor range, the heartbeat signal on the ALRML resumes once the fault condition is
removed.
Note 6: The voltage level of high is equal to V_AA and low is equal to AGND.
Note 7: Even if the pin has internal pulldown, the pulldown is very weak and the pin should be tied to AGND for logic 0 setting.
Note 8: VDD_U - GND_U = 3.3 - V and HV - DCIN = 3.6V for the typical configuration. When VDD_U and HV collapse, VDD_U - GND_U ≈
0 - V and HV - DCIN ≈ -0.4V.
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