The DS2740BU remains in production, however, for new projects, we recommend ModelGauge m5 MAX17211 fuel gauge.
The DS2740BU provides high-precision current-flow measurement data to support battery-capacity monitoring in cost-sensitive applications. Current is measured bidirectionally over a dynamic range of 15 bits (DS2740U) or 13 bits (DS2740BU), with the net flow accumulated in a separate 16-bit register. Through its 1-Wire interface, the DS2740BU allows the host system read/write access to status and current measurement registers. Each device has a unique factory-programmed 64-bit net address that allows it to be individually addressed by the host system, supporting multibattery slot operation. The interface can be operated with standard or overdrive timing. Although the DS2740BU is primarily intended for location on the host system, it is also suited for mounting in the battery pack. The DS2740BU and FuelPack algorithms, along with host measurements of temperature and voltage, form a complete and accurate solution for estimating remaining capacity.Feature
- 15-Bit Bidirectional Current Measurement (DS2740U)
- 1.56μV LSB and ±51.2mV Dynamic Range
- 78μA LSB and ±2.56A Dynamic Range with External 20mΩ Sense Resistor (RSNS)
- 156μA LSB and ±5.12A Dynamic Range with External 10mΩ Sense Resistor (RSNS)
- 13-Bit Bidirectional Current Measurement (DS2740BU)
- 6.25μV LSB and ±51.2mV Dynamic Range
- 312μA LSB and ±2.56A Dynamic Range with External 20mΩ Sense Resistor (RSNS)
- 625μA LSB and ±5.12A Dynamic Range with External 10mΩ Sense Resistor (RSNS)
- Analog Input Filter (IS1, IS2) Extends Dynamic Range for Pulse-Load Applications
- Current Accumulation Register Resolution
- 6.25μVhr (Both DS2740U and DS2740BU)
- 0.3125mAhr with External 20mΩ RSNS
- 0.6250mAhr with External 10mΩ RSNS
- Dallas 1-Wire Interface
- Unique 64-Bit Device Address
- Standard and Overdrive Timings (OVD)
- Low Power Consumption:
- Active Current: 65μA max
- Sleep Current: 1μA max
Applications
- Cell Phones
- Digital Still Cameras
- Portable Entertainment Devices
- Smart Battery Packs/Chargers
