bq76925
SLUSAM9A –JULY 2011–REVISED JULY 2011
www.ti.com
OPERATIONAL OVERVIEW
INTRODUCTION
The bq76925 Host controlled analog front end (AFE) is part of a complete pack monitoring, balancing and
protection system for 3 to 6 series cell Lithium batteries. The bq76925 allows a Host controller to easily monitor
individual cell voltages, pack current and temperature. This information can be used by the Host to detect and
act on a fault condition caused when one or more of these parameters exceed the limits of the application. In
addition, this information may be used by the Host to determine end-of-charge, end-of-discharge and other
gas-gauging and state of health conditions.
PACK+
VCTL
V3P3
AVCC
DVCC
BAT
VC6
VC5
VC4
VC3
VC2
VC1
+
-
SCL
SDA
SCL
SDA
P1.5
COMM
+
-
+
-
µController
VREF
VTB
VeREF+
Example:
+
-
bq76925
MSP430x20x2
or
equivalent
A0
RTH
RNTC
+
-
VCOUT
VIOUT
ALERT
A1
+
-
A2
VeREF-
VC0
AVSS
DVSS
VSS
RSENSE
NMI
SENSEN
SENSEP
Note: Some components
omitted for clarity.
FET Driver Circuits
PACK-
Example only. Not required.
Figure 2. Example of bq76925 With Host Controller
10
Copyright © 2011, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
