Overview
The LC709201F is an IC that measures the remaining power level of 1-cell lithium-ion secondary batteries by monitoring the battery voltage without an external sense resistor, and detects the remaining battery power level by current prediction. It monitors the battery voltage and realizes a function that precisely measures the remaining battery charge. In addition, the IC realizes the function for calculating the remaining battery power level even more accurately by utilizing a temperature correction function that makes use of the temperature input from a thermistor.

FEATUREs
■ Accuracy of remaining battery power level measurement
   • Accuracy of ±5% during discharging from 100% to 0% (at an ambient operating temperature of 0°C to 50°C)
■ Measurement of remaining battery power level
   • The remaining power level is measured four times a second and calculated with each measurement undertaken.
■ Interface
   • I2Cbus, communication in slave mode up to 100kHz supported
■ Ports
   • I2C-bus communication pin 2 (SDA, SCL)
   • Battery temperature reading control pin 1 (TSW)
   • Analog voltage input pin for battery temperature 1 (TSENSE)
   • Reset pin 1 (RESB)
   • TEST pin 1 (TEST)
   • Power supply pin 2 (VSS, VDD)
■ Package form
   • MFP10S (225 mil): LC709201FM-01/02/03
   • VCT16 (2.6×2.6): LC709201FRD-01/02/03

APPLICATIONs
• Cell phones, PDA devices, MP3 players, cordless phones, digital cameras, USB-related devices, etc.