LTC2942-1 1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement Fae Tseru Dpircse Tnoi n Indicates Accumulated Battery Charge and The LTC 2942-1 measures battery charge state, battery Discharge voltage and chip temperature in handheld PC and portable 2 n SMBus/I C Interface product applications. Its operating range is perfectly n Integrated 50m High Side Sense Resistor suited for single cell Li-Ion batteries. A precision coulomb n 1A Sense Current Range counter integrates current through an internal sense n High Accuracy Analog Integration resistor between the batterys positive terminal and the n ADC Measures Battery Voltage and Temperature load or charger. Battery voltage and on-chip temperature n Integrated Temperature Sensor are measured with an internal 14-bit No Latency n 1% Voltage and Charge Accuracy ADC. The three measured quantities (charge, voltage and n Configurable Alert Output/Charge Complete Input temperature) are stored in internal registers accessible via 2 n 2.7V to 5.5V Operating Range the onboard SMBus/I C interface. n Quiescent Current Less than 100A The LTC2942-1 features programmable high and low n Small 6-Pin 2mm 3mm DFN package thresholds for all three measured quantities. If a pro- grammed threshold is exceeded, the device communicates an alert using either the SMBus alert protocol or by setting a acilpp Tsnoi a flag in the internal status register. n Low Power Handheld Products L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Cellular Phones No Latency , ThinSOT and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n MP3 Players n Cameras n GPS T lacipy a acilpp Tnoi Total Charge Error vs Sense Current 1.00 V + = 3.6V SENSE 0.75 CHARGER LOAD 0.50 + SENSE 0.1F 0.25 LTC2942-1 AL/CC 0 2 I C/SMBus SDA SENSE TO HOST + 1-CELL 0.25 SCL Li-Ion 0.50 29421 TA01a GND 0.75 1.00 1 10 100 1000 I (mA) SENSE 29421 TA01b 29421f CHARGE ERROR (%)LTC2942-1 a ulosb T e m mumixa r a Tsgni p ni c no Farugi Tnoi (Notes 1, 2) + TOP VIEW Supply Voltage (SENSE ) ............................. 0.3V to 6V SCL, SDA, AL/CC ......................................... 0.3V to 6V + SENSE 1 6 SENSE Sense Current (into SENSE ) ....................................2A GND 7 5 AL/CC 2 Operating Ambient Temperature Range SCL 4 SDA 3 LTC2942-1C ............................................. 0C to 70C LTC2942-1I .......................................... 40C to 85C DCB PACKAGE 6-LEAD (2mm s 3mm) PLASTIC DFN Storage Temperature Range ................... 65C to 150C T = 150C, = 160C/W (Note 9) JMAX JA EXPOSED PAD (PIN 7): DO NOT CONNECT o r D re i n Famro Tnoi Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2942CDCB-1 TRMPBF LTC2942CDCB-1 TRPBF LDYR 6-Lead (2mm 3mm) Plastic DFN 0C to 70C LTC2942IDCB-1 TRMPBF LTC2942IDCB-1 TRPBF LDYR 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: