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bq28550-R1

SLUSAS4A – OCTOBER 2012 – REVISED SEPTEMBER 2014

bq28550-R1 Single Cell Li-Ion Battery Gas Gauge and Protection

Not Recommended for New Designs

Check for Samples: bq28550-R1

1

1 Features

•

A Comprehensive Single-Cell Li-Ion Battery Gas

3 Description

Gauge and Protection Integrates All Essential

The Texas Instruments bq28550-R1 battery gas

Functions:

gauge provides current and voltage protection, and

secure, SHA-1/HMAC authentication for single-cell

–

Low-Side N-CH FET Protection Control

Lithium-Ion battery packs. Designed for battery-pack

–

JEITA/Enhanced Charging

integration,

the

bq28550-R1

requires

host

–

Authentication

microcontroller firmware support for implementation.

A system processor communicates with the bq28550-

•

Records Battery Gas Gauge Information

R1 using a serial interface to obtain remaining battery

•

Protection Functions Help to Prevent:

capacity, system run-time predictions, and other

–

Short-Circuit

critical battery information.

–

Overcurrent Charge and Discharge

The bq28550-R1 gas gauge uses an accurate gas

–

Overvoltage Charge (Overcharge)

gauging algorithm to report the status of the cell. The

gauge provides information such as state-of-charge

–

Undervoltage (Over-Discharge)

(%), run-time-to-empty (min.), charge-time to full

•

Firmware Control of Discharge FET

(min.),

battery

voltage

(V),

and

pack

•

SHA-1/HMAC Battery Authentication

temperature (°C).

•

General Purpose I/O Configurable for One of the

The bq28550-R1 gas gauge also features integrated

Following:

support for secure battery-pack authentication, using

–

CFET Control

the SHA-1/HMAC authentication algorithm.

–

ALERT Output

Device Information(1)

•

DEVICE NAME

PACKAGE

BODY SIZE

Command Set Operation

bq28550-R1

VSON (12)

4.00 mm × 2.50 mm

•

12-pin, 2.50-mm x 4.00-mm SON Package

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

2 Applications

•

Tablet PCs

•

Slates

•

Digital Still and Video Cameras

•

Handheld Terminals

•

MP3 or Multimedia Players

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.