bq2016

GAS GAUGE IC FOR

HIGH DISCHARGE RATES

SLUS475A– JANUARY 2001 – REVISED NOVEMBER 2002

2

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

HDQ

1

I/O

Serial communication input/output. Open-drain bidirectional communications port.

RBI

4

I

Register backup input provides backup potential to the bq2016 registers during periods of low operating

voltage. RBI accepts a storage capacitor or a battery input.

REG

5

O

Regulator output provides a reference to control an n-JFET for VCC regulation to the bq2016 from the

battery potential.

VCC

7

I

Supply voltage input

VSS

8

Ground

LED1–LED5

10–14

O

LED display segment outputs that each may drive an external LED.

CVON

17

O

Cell voltage divider control. Output to connect the voltage divider on the voltage input during

measurement.

VPFC

24

I

Program capacity input. 16-level input to program the initial battery full-charge reference.

SB

26

I

Battery voltage input. Input connection to monitor battery–pack voltage.

SR2–SR1

21,22

I

Sense resistor inputs. Input connections for a small value sense resistor to monitor the battery charge and

discharge current flow.

SRC

20

I

Current sense voltage input to monitor instantaneous current.

DISP

9

I

Display activation input that activates the LED drivers LED1–LED5.

TS

19

I

Temperature sense input connects to an external thermistor or should be grounded when using the internal

thermistor. The function depends on the state of the PROG input.

PROG

25

I

Program input defines the temperature measurement thermistor (internal or external).

THON

18

O

Thermistor bias control output to control a switch in series with an optional external thermistor.

NC

2, 3, 6, 15,

16, 23, 27,

28

Do not connect. For proper device operation, these pins should not be connected.