MAX11080 Datasheet, PDF (5/27 Pages) Maxim Integrated Products – 12-Channel, High-Voltage Battery-Pack Fault Monitor

12-Channel, High-Voltage Battery-Pack
Fault Monitor
PIN
1
2
3, 33
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25, 29,
30, 32
26
27
28
Pin Description
NAME
FUNCTION
DCIN ^{DC Power-Supply Input. DCIN supplies the internal 3.3V regulator. This pin should be connected as shown}
in the application diagrams.
HV
High-Voltage Bias. HV is biased by the output of the charge pump to provide a DC supply above the DCIN
level. It is used internally to bias the cell-comparator circuitry. Bypass to DCIN with a 1µF capacitor.
N.C.
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
UVSEL0
UVSEL1
UVSEL2
OVSEL0
OVSEL1
OVSEL2
OVSEL3
V_AA
No Connection
Cell 12 Plus Connection. Top of battery module stack.
Cell 12 Minus Connection and Cell 11 Plus Connection
Cell 11 Minus Connection and Cell 10 Plus Connection
Cell 10 Minus Connection and Cell 9 Plus Connection
Cell 9 Minus Connection and Cell 8 Plus Connection
Cell 8 Minus Connection and Cell 7 Plus Connection
Cell 7 Minus Connection and Cell 6 Plus Connection
Cell 6 Minus Connection and Cell 5 Plus Connection
Cell 5 Minus Connection and Cell 4 Plus Connection
Cell 4 Minus Connection and Cell 3 Plus Connection
Cell 3 Minus Connection and Cell 2 Plus Connection
Cell 2 Minus Connection and Cell 1 Plus Connection
Cell 1 Minus Connection
Undervoltage Threshold Select 2 to 0. Used to select one of eight undervoltage alarm threshold settings.
The parts have internal pulldown; these pins should only be tied to V_AA or AGND to set the logic state.
Overvoltage Threshold Select 3 to 0. Used to select one of 16 overvoltage alarm threshold settings.
The parts have internal pulldown; these pins should only be tied to V_AA or AGND to set the logic state.
+3.3V Analog Supply Output. Bypass with a 1µF capacitor to AGND.
AGND Analog Ground. Should be connected to the negative terminal of cell 1.
SHDN
ALRM_L
CD
Active-Low Shutdown Input. This pin completely shuts down the MAX11080 internal regulator and
oscillators when the pin is less than 0.6V as referenced to AGND. The host controller should drive SHDN for
the first pack. SHDN for daisy-chained modules should be connected to the lower neighboring module’s
VDD_U through a 20kΩ series resistor.
Lower Port Alarm Output. This output is an alarm indicator for overvoltage, undervoltage, and setup faults.
The alarm signal is daisy chained and driven from the highest module down to the lowest. The alarm output
is nominally a clocked “heartbeat” signal that provides a 4kHz clock when no alarm is present. The ALRM_L
can also be configured as level signal and set to “low” for no alarm and “high” for alarm state. See the
TOPSEL Function section for details. This signal swings between V_AA and AGND, and is active high in the
alarm state.
Programmable Delay Time. Connect a capacitor from this pin to AGND to set the hold time required for a
fault condition before the alarm is set. The capacitor should be a ceramic capacitor in the 15nF to 16.5µF
range.
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