Texas Instruments BQ76942, Manual

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Figure 16-9. A Fast Turn-Off Case with a 100-Ω Series Gate Resistor
16.6 Unused Pins
Some device pins may not be needed in a particular application. The manner in which each should be
terminated in this case is described below.
Table 16-3. Terminating Unused Pins
Pin Name Recommendation
2, 4, 6, 8,
10, 12–
16, 48
VC0 – VC10
Cell inputs 1, 2, and 10 should always be connected to actual cells with cells connected between VC1 and
VC0, between VC2 and VC1, and VC10 and VC9. VC0 should be connected through a resistor and capacitor
on the pcb to pin 17 (VSS). Pins related to any unused cells (which may be cell 3–cell 9) can be connected to
the cell stack to measure interconnect resistance or provide a Kelvin-connection to actual cells, in which case
they should include a series resistor and parallel capacitor in similar fashion to pins connected to actual cells
(see
Usage of VC Pins for Cells Versus Interconnect ). Another option is to short unused VC pins directly to an
adjacent VC pin. All VC pins should be connected to either an adjacent VC pin, an actual cell (through R and C),
or stack interconnect resistance (through R and C).
18, 20 SRP, SRN If not used, these pins should be connected to pin 17 (VSS).
1, 3, 5, 7,
9, 11, 19,
44
NC
These pins are not connected to silicon. They can be left floating or connected to an adjacent pin or connected
to VSS.
21, 23,
25, 28,
29, 30,
31, 32
TS1, TS3,
ALERT, HDQ,
CFETOFF,
DFETOFF,
DCHG, DDSG
If not used, these pins can be left floating or connected to pin 17 (VSS). Any of these pins (except for TS1 and
TS3) may be configured with the internal weak pulldown resistance enabled during operation, although this is
not necessary.
22 TS2
If the device is intended to enter SHUTDOWN mode, the TS2 pin should be left floating. If SHUTDOWN mode is
not used in the application and the TS2 pin is not used for a thermistor or ADCIN measurement, the TS2 pin can
be left floating or connected to pin 17 (VSS).
33 RST_SHUT If not used, this pin should be connected to pin 17 (VSS).
34, 35 REG1, REG2 If not used, these pins can be left floating or connected to pin 17 (VSS).
36 REGIN If not used, this pin should be connected to pin 17 (VSS).
37 BREG
If this pin is not used and pin 36 (REGIN) is also not used, both pins should be connected to pin 17 (VSS). If this
pin is not used but pin 36 is used (such as driven from an external source), then this pin should be connected to
pin 36 (REGIN).
38 FUSE If not used, this pin can be left floating or connected to pin 17 (VSS).
39 PDSG If not used, this pin should be left floating.
BQ76942
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
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