Datasheet

SMBC
SMBD
SMBC
SMBD
SMBC
SMBD
S
t
SU(STA)
SP
t
BUF
t
SU(STO)
t
r
t
f
SMBC
SMBD
t
TIMEOUT
t
HIGH
t
LOW
t
f
t
r
t
HD(DAT)
t
SU(DAT)
t
HD(STA)
Start and Stop Condition Wait and Hold Condition
Timeout Condition Repeated Start Condition
bq28400
SLUSA61A –OCTOBER 2010–REVISED DECEMBER 2010 www.ti.com
TIMING CIRCUITS
Figure 1. Timing Conditions
GENERAL OVERVIEW
The bq28400 has a flexible architecture that enables development of numerous battery-management solutions.
The device is a fully integrated battery manager, as shown in the functional block diagram, and performs
necessary calculations and control for a fully functional 2-series cell battery management system. The device
provides flexible user settings that are stored in flash memory.
The bq28400 determines battery capacity by monitoring the amount of charge input or removal from 2-series cell
Li-Ion rechargeable batteries via a small value series sense resistor. The device then controls and reports the
battery status using corrections for environmental and operating conditions. Additional control and monitoring is
implemented for individual cell voltages, temperature, and current.
12 Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): bq28400