12-Channel, High-Voltage Battery-Pack

Fault Monitor

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5

Pin Description

PIN

NAME

FUNCTION

1

DCIN

DC Power-Supply Input. DCIN supplies the internal 3.3V regulator. This pin should be connected as shown

in the application diagrams.

2HV

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.

3, 33

N.C.

No Connection

4

C12

Cell 12 Plus Connection. Top of battery module stack.

5

C11

Cell 12 Minus Connection and Cell 11 Plus Connection

6

C10

Cell 11 Minus Connection and Cell 10 Plus Connection

7

C9

Cell 10 Minus Connection and Cell 9 Plus Connection

8

C8

Cell 9 Minus Connection and Cell 8 Plus Connection

9

C7

Cell 8 Minus Connection and Cell 7 Plus Connection

10

C6

Cell 7 Minus Connection and Cell 6 Plus Connection

11

C5

Cell 6 Minus Connection and Cell 5 Plus Connection

12

C4

Cell 5 Minus Connection and Cell 4 Plus Connection

13

C3

Cell 4 Minus Connection and Cell 3 Plus Connection

14

C2

Cell 3 Minus Connection and Cell 2 Plus Connection

15

C1

Cell 2 Minus Connection and Cell 1 Plus Connection

16

C0

Cell 1 Minus Connection

17

UVSEL0

18

UVSEL1

19

UVSEL2

Undervoltage Threshold Select 2 to 0. Used to select one of eight undervoltage alarm threshold settings.

20

OVSEL0

21

OVSEL1

22

OVSEL2

23

OVSEL3

Overvoltage Threshold Select 3 to 0. Used to select one of 16 overvoltage alarm threshold settings.

24

+3.3V Analog Supply Output. Bypass with a 1µF capacitor to AGND.

25, 29,

30, 32

AGND

Analog Ground. Should be connected to the negative terminal of cell 1.

26

SHDN

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

Ω series resistor.

27

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

can also be configured as level signal and set to “low” for no alarm and “high” for alarm state. See the

alarm state.

28

CD

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.