DS2745

19-4631; 5/09 www.DataSheet4U.com DS2745 Low-Cost I C Battery Monitor www.maxim-ic.com 2 FEATURES 16-Bit Bidirectional Current Measurement 1.56V LSB, ±51.2mV Dynamic Range 104A LSB, ±3.4A Dynamic Range (RSNS = 15m) Current Accumulation Register Resolution 6.25Vhr LSB, ±204.8mVh Range 0.417mAhr LSB, ±13.65Ah Range (RSNS = 15m) 11-Bit Voltage Measurement 4.88mV LSB, 0V to 4.5V Input Range 11-Bit Temperature Measurement 0.125ºC Resolution, -20ºC to +70ºC Industry Standard I2C* Interface Low Power Consumption: Active Current: 70A typical, 100A max Sleep Current: 1A typical, 3A max PIN CONFIGURATION SCL SDA PIO SNS 1 2 3 4 8 7 6 5 VDD VIN CTG VSS MAX See Table 1 for Ordering Information. DESCRIPTION The DS2745 provides current-flow, voltage, and temperature measurement data to support batterycapacity monitoring in cost-sensitive applications. The DS2745 can be mounted on either the host side or pack side of the application. Current measurement and coulomb counting is accomplished by monitoring the voltage drop across an external sense resistor, voltage measurement is accomplished through a separate voltage-sense input, and temperature measurement takes place on-chip. A standard I2C interface with software programmable address gives the controlling microprocessor access to all data and status registers inside the DS2745. A low-power sleep mode state conserves energy when the cell pack is in storage. BLOCK DIAGRAM APPLICATIONS Cellular GPS PDAs Handheld Products T...