L9963E datasheet(151/184 Pages) STMICROELECTRONICS

151 / 184 page

6.10

Unused pins

The following paragraph contains instructions about how to connect unused pins. If these indications are not met,

L9963E will not operate properly.

6.10.1

Cell pins

6.10.1.1

Cell minimum configuration

The minimum configuration that allows L9963E correct functionality is the following:

•

At least the following four cells must be mounted:

–

CELL1

–

CELL2

–

CELL13

–

CELL14

•

The VCELLX_EN bit must be set to ‘1’ only for these four cells, in order to allow correct conversion and

diagnostics.

•

Nominal stack voltage must be always higher than VBAT_UV_WARNING.

6.10.1.2

Cell maximum configuration

The maximum configuration that L9963E can handle is:

•

All the fourteen cells mounted

•

The VCELLX_EN bit must be set to ‘1’ for all the cells

•

Nominal stack voltage must be always lower than the VBAT operating range specified in Table 2.

Refer to Figure 32 as an example.

6.10.1.3

Unmounted cells

If less than 14 cells are mounted, the following indications must be followed in order to ensure proper

measurement and diagnostic operation:

If N cells are not mounted:

•

Unmount N/2 ajacent couples as shown in Figure 47:

–

In case analog front end components are left mounted

◦

Simply short unused cells PCB connectors

–

In case analog front end components are removed from BOM

◦

Unused pins must be first shorted together to eliminate differential noise

◦

Shorted traces must be connected to the PCB connector of the lower mounted cell, through

a 1 kΩ resistor

•

If a remaining spare cell has to be left unmounted, then it must be an odd cell, as shown in Figure 47:

–

In order to guarantee the correct biasing of the internal sensing & balancing circuitry, the recommended

components must be mounted and connection to the busbar has to be done

Cells not mounted must have their corresponding VCELLx_EN bit set to ‘0’ in order to disable the related

diagnostics, otherwise wrong failures could be latched (such as cell UV).

L9963E

Unused pins

DS13636 - Rev 12

page 151/184

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