LTC2944 60V Battery Gas Gauge with Temperature, Voltage and Current Measurement Fea T Descrip T n Measures Accumulated Battery Charge The LTC 2944 measures battery charge state, battery volt- and Discharge age, battery current and its own temperature in portable n 3.6V to 60V Operating Range for Multiple Cells product applications. The wide input voltage range allows n use with multicell batteries up to 60V. A precision coulomb 14-Bit ADC Measures Voltage, Current counter integrates current through a sense resistor between and Temperature n the batterys positive terminal and the load or charger. 1% Voltage, Current and Charge Accuracy n Voltage, current and temperature are measured with an 50mV Sense Voltage Range n internal 14-bit No Latency ADC. The measurements High Side Sense 2 are stored in internal registers accessible via the onboard n I C Interface/SMBus Interface 2 I C/SMBus Interface. n General Purpose Measurements for Any Battery Chemistry and Capacity The LTC2944 features programmable high and low thresh- n Configurable Alert Output/Charge Complete Input olds for all four measured quantities. If a programmed n Quiescent Current Less Than 150A threshold is exceeded, the device communicates an alert n Small 8-Lead 3mm 3mm DFN Package using either the SMBus alert protocol or by setting a flag in the internal status register. The LTC2944 requires only a single low value sense resistor to set the measured a T current range. n Electric and Hybrid Electric Vehicles All registered trademarks and trademarks are the property of their respective owners. n Power Tools n Electric Bicycles, Motorcycles, Scooters n High Power Portable Equipment n Photo Voltaics n Backup Battery Systems Typical a T Total Charge Error vs Differential Sense Voltage 1A 3 CHARGER + LOAD 3.3V V = 3.6V TO 60V SENSE 1F 2 LTC2944 2k 2k 2k + 1 SENSE V DD ALCC R SENSE 50m 0 P SDA SENSE SCL + 1 GND MULTICELL Li-ION 2 2944 TA01a 3 0.1 1 10 100 V (mV) SENSE 2944 TA01b 2944fa 1 For more information www.linear.com/LTC2944 CHARGE ERROR (%) ion pplica ions pplica ion uresLTC2944 a Te Maxi Mu M r a T p c F T (Notes 1, 2) + Supply Voltage (SENSE ) ........................... 0.3V to 65V TOP VIEW SCL, SDA, ALCC Voltage .............................. 0.3V to 6V + + SENSE ...............(0.3V + V ) to (V + 0.3V) + SENSE SENSE SENSE 1 8 SENSE Operating Ambient Temperature Range GND 2 7 GND 9 LTC2944C ............................................... 0C to 70C GND 3 6 ALCC SCL SDA 4 5 LTC2944I ............................................40C to 85C Storage Temperature Range .................. 65C to 150C DD PACKAGE 8-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 100C/W JMAX JA EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL o r D i n F Ma T