The DS2746 provides system-side battery capacity monitoring in cost-sensitive applications. The tiny 3mm by 3mm TDFN package consumes only 9mm2 of PCB space. Voltage, bidirectional current and cumulative current measurements are provided to the host processor through a 2-wire interface. The offset offset and offset blanking characteristics greatly improve the accuracy of coulomb counter.
Pin arrangement
In addition, the DS2746 has two auxiliary A/D inputs to sample the packet identification resistor, thermistor or other voltage source. The result is reported as a proportional fraction of the power supply voltage elimination error associated with the power supply.
Typical operating circuit
The DS2746 reduces the total power consumption of the measurement circuit by enabling a resistive voltage divider through a VOUT pin only when making measurements. Low power sleep mode reduces current consumption while maintaining coulomb counts when the system is inactive.
Block Diagram
Applications
● 2.5G/3G Wireless Handsets
● PDA/Smartphones
● Digital Still and Video Cameras
● Handheld Computers and Terminals
