LTC2943-1 1A Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement Fea T Descrip T n Measures Accumulated Battery Charge and Discharge The LTC 2943-1 measures battery charge state, battery n 3.6V to 20V Operating Range for Multiple Cells voltage, battery current and its own temperature in portable n Integrated 50m High Side Sense Resistor product applications. The wide input voltage range allows n 1A Current Sense Range use with multicell batteries up to 20V. A precision coulomb n 14-Bit ADC Measures Voltage, Current and counter integrates current through a sense resistor between Temperature the batterys positive terminal and the load or charger. n 1% Voltage, Current and Charge Accuracy Voltage, current and temperature are measured with an n High Side Sense internal 14-bit No Latency ADC. The measurements n General Purpose Measurements for Any Battery are stored in internal registers accessible via the onboard 2 Chemistry and Capacity I C/SMBus Interface. 2 n I C/SMBus Interface The LTC2943-1 features programmable high and low n Configurable Alert Output/Charge Complete Input thresholds for all four measured quantities. If a pro- n Quiescent Current Less Than 120A grammed threshold is exceeded, the device communicates n Small 8-Lead 3mm 3mm DFN Package an alert using either the SMBus alert protocol or by setting a flag in the internal status register. a T L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patent, 8390363. n Power Tools n Portable Medical Equipment n Video Cameras Typical a T Total Charge Error vs Current Sense 2.0 1A + V = 10V CHARGER SENSE LOAD 3.3V 1.5 1F 1.0 LTC2943-1 2k 2k 2k + 0.5 SENSE V DD ALCC 0 P SDA SENSE 0.5 SCL + GND MULTICELL 1.0 LI-ION 1.5 29431 TA01a 2.0 1 10 100 1k I (mA) SENSE 29431 TA01b 29431f 1 For more information www.linear.com/LTC2943-1 CHARGE ERROR (%) ion pplica ions pplica ion uresLTC2943-1 a Te Maxi Mu M r a T p c F T (Notes 1, 2) + Supply Voltage (SENSE ) ........................... 0.3V to 24V TOP VIEW SCL, SDA, ALCC Voltage .............................. 0.3V to 6V + SENSE 1 8 SENSE Sense Current (into SENSE ) ....................................2A GND 2 7 GND Operating Ambient Temperature Range 9 GND 3 6 ALCC LTC2943C-1 ............................................ 0C to 70C SCL 4 5 SDA LTC2943I-1 .........................................40C to 85C Storage Temperature Range .................. 65C to 150C DD PACKAGE 8-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 53.4C/W JMAX JA EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2943CDD-1 PBF LTC2943CDD-1 TRPBF LGQN 8-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC2943IDD-1 PBF LTC2943IDD-1 TRPBF LGQN 8-Lead (3mm 3mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: