LTC2942CDCB#TRMPBF Analog Devices

LTC2942 Battery Gas Gauge with Temperature, Voltage Measurement Fea T Descrip T n Indicates Accumulated Battery Charge and The LTC 2942 measures battery charge state, battery Discharge voltage and chip temperature in handheld PC and portable n High Accuracy Analog Integration product applications. Its operating range is perfectly suited n ADC Measures Battery Voltage and Temperature for single-cell Li-Ion batteries. A precision coulomb counter n Integrated Temperature Sensor integrates current through a sense resistor between the n High Side Sense batterys positive terminal and the load or charger. Battery n 1% Voltage and Charge Accuracy voltage and on-chip temperature are measured with an n 50mV Sense Voltage Range internal 14-bit No Latency ADC. The three measured 2 n SMBus/I C Interface quantities (charge, voltage and temperature) are stored in 2 n Configurable Alert Output/Charge Complete Input internal registers accessible via the onboard SMBus/I C n 2.7V to 5.5V Operating Range interface. n Quiescent Current Less than 100A The LTC2942 features programmable high and low thresh- n Small 6-Pin 2mm 3mm DFN package olds for all three measured quantities. If a programmed threshold is exceeded, the device communicates an alert using either the SMBus alert protocol or by setting a flag a T in the internal status register. n Low Power Handheld Products n The LTC2942 requires only a single low value sense resis- Cellular Phones n tor to set the measured current range. MP3 Players n Cameras L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency , ThinSOT and Bat-Track are trademarks of Linear Technology Corporation. n GPS All other trademarks are the property of their respective owners. Typical a T Total Charge Error vs Differential Sense Voltage 2.0 V + = 3.6V SENSE 1.5 CHARGER LOAD 1.0 0.1F + SENSE 0.5 LTC2942 R SENSE AL/CC 100m 2 I C/SMBus 0 SDA SENSE TO HOST SCL 0.5 + GND 1-CELL Li-Ion 1.0 2942 TA01a 1.5 2.0 0.1 1 10 100 V (mV) SENSE 2942 TA01b 2942fa 1 CHARGE ERROR (%) ion pplica ions pplica ion uresLTC2942 a Te m aximum r a T p in c F T (Notes 1, 2) + Supply Voltage (SENSE ) ............................. 0.3V to 6V TOP VIEW SCL, SDA, AL/CC ......................................... 0.3V to 6V + 6 SENSE 1 SENSE + SENSE .................................. 0.3V to (V + 0.3V) SENSE 7 GND 2 5 AL/CC Operating Ambient Temperature Range LTC2942C ................................................ 0C to 70C SCL 3 4 SDA LTC2942I.............................................. 40C to 85C DCB PACKAGE Storage Temperature Range ................... 65C to 150C 6-LEAD (2mm 3mm) PLASTIC DFN T = 150C, = 120C/W JMAX JA EXPOSED PAD (PIN 7), DO NOT CONNECT o r Der i n F T Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2942CDCB#TRMPBF LTC2942CDCB#TRPBF LDVN 6-Lead (2mm 3mm) Plastic DFN 0C to 70C LTC2942IDCB#TRMPBF LTC2942IDCB#TRPBF LDVN 6-Lead (2mm 3mm) Plastic DFN 40C to 85C TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts. For more information on lead free part marking, go to: