L9963E datasheet(153/184 Pages) STMICROELECTRONICS

153 / 184 page

6.10.2.2

FAULT line (GPIO1-2)

When FAULT Line is not used in application:

•

GPIO1_FAULTH pin must be shorted (or pulled-down with a resistor) to GND plane (AGND is

recommended)

•

GPIO2_FAULTL pin must be connected to GND plane (DGND is recommended) through a 100 kΩ pulldown

resistor

6.10.3

Current sense

When current sense is not used in application:

•

Pin ISENSEp must be shorted to pin ISENSEm in order to reject differential noise

•

The shorted trace must be connected to GND plane (AGND is recommended) in order to reject common

mode noise

6.10.4

ISOH port

When the ISOH port is not used in application:

•

Pin ISOHp and ISOHm must be shorted together in order to reject differential noise. They are internally

pulled down to reject common mode noise.

6.10.5

Busbar connection

Figure 48 shows an example of application featuring small cell modules connected through a busbar. Since the

busbar exhibits a small parasitic resistance RBUS, a negative voltage drop equal to RBUS*ICELL appears at those

cell terminals during the battery discharge phase.

Generally, such a drop never exceeds -2 V. L9963E has been engineered to sustain this kind of application

without damaging the internal ESD clamps. In fact, all cell terminals (except the C0-C1 pair), can sustain

negative differential voltages without undergoing any damage, as listed in Table 3. Busbar connection can

be applied between any cell terminal pair, except the ones reserved for the four mandatory cells (refer to

Section 6.10.1.1 Cell minimum configuration).

The internal balancing FET in parallel to the busbar can be protected mounting the same RDIS discharge

resistor recommended in Table 77. When negative voltage arises, a small current will flow through the body-drain

diode. Such a current, equal to (VBUS – VBODY_DRAIN) / RDIS will not damage the balancing FET. For instance,

considering VBUS = -2 V, VBODY_DRAIN = 1 V and RDIS = 39 Ω, the current will be limited to 25 mA.

Moreover, since this reverse current flows only through the balancing path, it will not alter neighboring cells

measurement, since no drop occurs on the RLPF filtering resistors, as shown in Figure 48.

L9963E

Unused pins

DS13636 - Rev 12

page 153/184

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