BQ7693003DBT datasheet(39/68 Pages) TI2

39 / 68 page

temperature measurement is not used. When thermistors are removable, they should be substituted with a test

resistance at board test to prevent XREADY faults during test. The TSn pins should not be pulled below their

reference power pin or the device may not start properly or the ADC may not operate properly.

A capacitor across the thermistor is not required but may filter noise picked up by thermistor leads. The

thermistor is biased 37.5 ms before measurement begins, so a 4.7-nF capacitor, such as is used on the

evaluation module or smaller, allows many time constants for settling before measurement.

Note

The capacitor across the thermistor does not filter noise that may be picked up by the thermistor leads

between different thermistors on the BQ76930 or BQ76940 devices.

TS1 is also used to boot the part. A rising edge is required for boot. A high level maintained on TS1 does not

prevent shutdown or waking the part. A voltage level maintained on the TS1 pin after boot affects the voltage

on the thermistor and the temperature determined by the MCU if external temperature sensing is used in normal

operation.

9.1.7 Unused Pins

Pins should be connected to the appropriate circuits, as shown in the simplified diagrams in Typical Applications

and as described in the Pin Configuration and Functions section. See Pin Usage for additional comments.

Table 9-1. Pin Usage

PIN NAME

RECOMMENDATION

DSG, CHG

DSG and CHG are outputs and may be left unconnected if not used.

VSS

Must be used

SDA, SCL

Must be used

TSn

Must have a thermistor or pull down resistor to the group reference.

TS1 must have a rising edge to boot the part.

CAPn

A capacitor must be installed.

REGOUT

REGOUT also supplies internal circuits. A capacitor must be

installed even if REGOUT is not used for external circuitry.

REGSRC

Must be supplied

BAT

Primary power pin for the part, must be connected to the top cell

through the power filter

VC5x, VC10x

Must connect to the appropriate cell through the power filter

Some pins named NC must be connected to the appropriate CAPn

pin. See Pin Configuration and Functions .

VCn

Cell voltage sense input pins. Must be connected through the

input filter to the cells. When not all cells are needed, connect as

described in Configuring Alternative Cell Counts.

SRP, SRN

Current sense inputs. When not used, connect to VSS.

ALERT

When not used, a pulldown is recommended. See Alert Pin.

9.1.8 Configuring Alternative Cell Counts

Each BQ769x0 family of IC's support a variety of cell counts. The following tables provide guidance on which

device and which input pins to use, depending on the number of cells in the pack.

Table 9-2. Cell Connections for BQ76920

Cell Input

3 Cells

4 Cells

5 Cells

VC5–VC4

CELL 3

CELL 4

CELL 5

VC4–VC3

short

CELL 4

VC3–VC2

short

CELL 3

VC2–VC1

CELL 2

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BQ76920, BQ76930, BQ76940

SLUSBK2I – OCTOBER 2013 – REVISED MARCH 2022

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