深圳市中立信电子科技有限公司

DS2745U+T&R

电池管理 I2C Battery Monitor Fuel Gauge

Low-Cost I2C Battery Monitor

DESCRIPTION

The DS2745U 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 I2  C  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.

DS2745U 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 I2

C Interface

Low Power Consumption:

Active Current:

70A typical, 100A max

Sleep Current:

1A typical, 3A max 

DS2745U APPLICATIONS

Cellular

GPS

PDAs

Handheld Products