DESCRIPTION

The DS2745 provides current-flow, voltage, and temperature measurement data to support battery capacity 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.

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