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BQ2014SN-D120

NiCd/NiMH gas gauge W/1-wire (DQ) I/F, 5 LED drivers, Control Signals for BQ2004 Fast-charge IC

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

BQ2014SN-D120
Datasheet:

BQ2014SN-D120 Datasheet (PDF)
Cell chemistry:

NiCd, NiMH
Number of series cells:

2-4 Cells
Communication interface:

DQ
Battery capacity (min) (mAh):

500
EDA/CAD Models:

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BQ2014SN-D120 General Description

The bq2014 Gas Gauge IC is intended for battery-pack or in-system installation to maintain an accurate record of available battery charge. The IC monitors the voltage drop across a sense resistor connected in series between the negative battery terminal and ground to determine charge and discharge activity of the battery.

Self-discharge of NiMH and NiCd batteries is estimated based on an internal timer and temperature sensor. Compensations for battery temperature and rate of charge or discharge are applied to the charge, discharge, and self-discharge calculations to provide available charge information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or "learned," in the course of a discharge cycle from full to empty.

The bq2014 includes a charge control output that controls an external Fast Charge IC such as the bq2004.

Nominal Available Charge (NAC) may be directly indicated using a five-segment LED display.

The bq2014 supports a simple single-line bidirectional serial link to an external processor (with a common ground). The bq2014 outputs battery information in response to external commands over the serial link.

Internal registers include available charge, temperature, capacity, battery voltage, battery ID, battery status, and programming pin settings. To support subassembly testing, the outputs may also be controlled. The external processor may also overwrite some of the bq2014 gas gauge data registers.

The bq2014 may operate directly from three or four cells. With the REF output and an external transistor, a simple, inexpensive regulator can be built to provide V_CC across a greater number of cells.

Key Features

Conservative and repeatable measurement of available charge in rechargeable batteries
Charge control output operates an external charge controller such as the bq2004 Fast Charge IC
Designed for battery pack integration
- 120µA typical standby current
Display capacity via single-wire serial communication port or direct drive of LEDs
Measurements compensated for current and temperature
Self-discharge compensation using internal temperature sensor
User-selectable end-of-discharge threshold
Battery voltage, nominal available charge, temperature, etc. available over serial port
16-pin narrow SOIC

Specifications

Cell chemistry	NiCd, NiMH	Number of series cells	2-4 Cells
Communication interface	DQ	Battery capacity (min) (mAh)	500
Battery capacity (max) (mAh)	6000	Implementation	Pack
External capacity indication	LED	Features	Coulomb Counter
Operating temperature range (°C)	0 to 70	Rating	Catalog
feature-type	Fuel Gauge	feature-battery-type	NiCd\|NiMH
feature-process-technology		feature-maximum-supply-current-ma	0.25
feature-minimum-operating-supply-voltage-v	3	feature-maximum-operating-supply-voltage-v	6.5
feature-output-voltage-v		feature-output-current-ma
feature-maximum-power-dissipation-mw		feature-packaging	Tube
feature-rad-hard		feature-pin-count	16
feature-cecc-qualified	No	feature-esd-protection
feature-military	No	feature-aec-qualified	No
feature-aec-qualified-number		feature-eccn-code	EAR99
feature-svhc	Yes	feature-svhc-exceeds-threshold	No