BQ2012 ,NiCd/NiMH Gas Gauge With 1-Wire (DQ) Interface, 5 LED Drivers And Slow-Charge ControlNot Recommended For New Designsbq2012Gas Gauge IC WithSlow-Charge Controlmeans of controlling charg ..
BQ2012 ,NiCd/NiMH Gas Gauge With 1-Wire (DQ) Interface, 5 LED Drivers And Slow-Charge ControlGeneral Descriptionon the battery's charge state.➤ Conservative and repeatable The bq2012 Gas Gauge ..
BQ2012 ,NiCd/NiMH Gas Gauge With 1-Wire (DQ) Interface, 5 LED Drivers And Slow-Charge ControlGeneral Descriptionon the battery's charge state.➤ Conservative and repeatable The bq2012 Gas Gauge ..
BQ2012SN , Gas Gauge IC With Slow-Charge Control
bq2012SN , Gas Gauge IC With Slow-Charge Control
BQ2012SN , Gas Gauge IC With Slow-Charge Control
BUD42D ,High Speed, High Gain Bipolar NPN TransistorELECTRICAL CHARACTERISTICS (T = 25°C unless otherwise noted)CÎÎÎCharacteristic Symbol Min Typ Max U ..
BUF01900AIPW ,Reference Voltage Generator for VCOM Adjustment 8-TSSOP MAXIMUM RATINGSSupply Voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
BUF04 ,Closed-Loop High Speed BufferCHARACTERISTICSGain A R = 2 kΩ, 0.995 0.9977 1.005 V/VVCL L–40°C ≤ T ≤ +85°C 0.995 1.005 V/VAGain L ..
BUF04701AIDGS ,4-Channel, 12V, CMOS Buffer AmplifierELECTRICAL CHARACTERISTICS: V = +3.5V to +12VSBoldface limits apply over the specified temperature ..
BUF04701AIDGSR ,4-Channel, 12V, CMOS Buffer Amplifierfeatures rail-* HIGH SLEW RATE: 10V/µ sto-rail input and output capability, giving maximum dynamic* ..
BUF04701AIPWR ,4-Channel, 12V, CMOS Buffer AmplifierMAXIMUM RATINGSELECTROSTATICSupply Voltage, V+ to V– .. 13.2VDISCHARGE SENSITIVITY(2)Signal Input T ..
BQ2012-BQ2012SN-D107-BQ2012SN-D107G4-BQ2012SN-D107TR
NiCd/NiMH Gas Gauge With 1-Wire (DQ) Interface, 5 LED Drivers And Slow-Charge Control
Features Conservative and repeatable
measurementof available charge
inrechargeable batteries Charge controloutput Designed for battery pack inte-
gration
120µA typical standby current
(self-dischargeestimationmode)
Small size enables imple-
mentations in as little as12square inch of PCB Integrate withina systemorasa
stand-alonedevice
Display capacity via single-
wire serial communication
port or direct drive of LEDs Measurements compensatedfor
current andtemperature Self-discharge compensation us-
ing internaltemperature sensor 16-pin narrow SOIC
General DescriptionThe bq2012 Gas GaugeICis in-
tendedfor battery-packor in-system
installationto maintainan accurate
recordof available battery charge.
TheIC monitorsa voltage drop
acrossa sense resistor connectedin
series between the negative battery
terminal and groundto determine
charge and discharge activityof the
battery.
Self-dischargeof NiMH and NiCd
batteriesis estimated basedonan
internal timer and temperature sen-
sor. Compensationsfor battery tem-
perature and rateof chargeor dis-
charge are appliedto the charge,
discharge, and self-discharge calcu-
lationsto provide available charge
information acrossa wide rangeof
operating conditions. Battery capac-
ityis automatically recalibrated,or
“learned,”in the courseofa dis-
charge cycle fromfullto empty.
The bq2012 includesa charge con-
trol output that, when used with
other full-charge safety termination
methods, can providea cost-effective
meansof controlling charge based
onthe battery's charge state.
Nominal available charge maybedi-
rectly indicated usinga five-or six-
segment LED display. These seg-
ments are usedto graphically indi-
cate nominal available charge.
The bq2012 supportsa simple
single-line bidirectional serial linkto external processor (common
ground). The bq2012 outputs battery
informationin responseto external
commandsoverthe serial link.
Internal registers include available
charge, temperature, capacity, battery
ID, battery status, and programming
pin settings.To support subassembly
testing, the outputs may alsobe con-
trolled. The external processor may
also overwrite someofthe bq2012 gas
gauge dataregisters.
The bq2012 may operate directly
from threeor four cells. With the
REF output andan external transis-
tor,a simple, inexpensive regulator
canbe builtto provide VCC acrossa
greaternumber ofcells.
LCOM LED common output
SEG1/PROG1 LED segment1/
program1 input
SEG2/PROG2 LED segment2/
program2 input
SEG3/PROG3 LED segment3/
program3 input
SEG4/PROG4 LED segment4/
program4 input
SEG5/PROG5 LED segment5/
program5 input
SEG6/PROG6 LED segment6/
program6 input
REF Voltage reference output
CHG Charge control output Serial communications
input/output
EMPTY Empty battery indicator
output Battery sense input
DISP Display control input Sense resistor input
VCC 3.0–6.5V
VSS System ground
Pin Connections Pin Names
bq2012
Gas Gauge IC With
Slow-Charge Control9/96 B
Not Recommended For New Designs
