STEVAL-ISQ008V1

STEVAL-ISQ008V1 Fuel gauge implementation based on the STM32F103x Data brief Features ■ Single-cell Li-Ion battery fuel gauge technology ■ Dual selectable power input source: – USB connection or external DC power source 5 V ■ Battery fuel capacity monitoring by on-chip 12bit ADC ■ Based on the Micro STM32 (ARM Cortex™-M3 core) family ■ RoHS compliant Description Fuel gauge technology is a smart system which monitors battery capacity, predicting the remaining capacity and displaying its status. The basic unit of measurement used for battery capacity is Coulomb counting, in which the current flowing through the battery is continuously monitored and integrated to calculate the capacity. ) (s ) s ( ct u d o r P e s b O t e l o STEVAL-ISQ008V1 t c u d o r Current measurement is done when the battery is both discharging and charging. Therefore, both the IN and OUT current are used to calculate the remaining capacity of the battery. P e t e l o s b O Battery capacity is measured in mAh. January 2011 Doc ID 18364 Rev 1 For further information contact your local STMicroelectronics sales office. 1/7 www.st.com 7 1 Schematics Figure 1. Microcontroller section '  ' /(' -7$*B3% -7$*B3% -7$*B3$ -7$*B3$ STEVAL-ISQ008V1 %227 6'$B3% 6&/B3% Schematics 9 /(' 5 %227 5 8             9 9  S) & 5 6: 9''B 966B 3% 3% %227 3% 3% 3% 3% 3% 3$ 3$ Y