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DS2745
Low-Cost I²C Battery Monitor
Low-cost battery fuel gauge that monitors current, voltage, and temperature
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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: DS2745EVKIT NOTE: This product uses the following:DS2745K Evaluation Kit Software
Key Features
- 16-Bit Bidirectional Current Measurement
- 1.56µV LSB, ±51.2mV Dynamic Range
- 104µA LSB, ±3.4A Dynamic Range (RSNS = 15mΩ)
- Current Accumulation Register Resolution
- 6.25µVhr LSB, ±204.8mVh Range
- 0.417mAhr LSB, ±13.65Ah Range (RSNS = 15mΩ)
- 11-Bit Voltage Measurement
- 4.88mV LSB, 0V to 5V Input Range
- 11-Bit Temperature Measurement
- 0.125°C Resolution, -20°C to +70°C
- Industry Standard I²C Interface
- Low Power Consumption:
- Active Current: 70µA typical, 100µA max
- Sleep Current: 1µA typical, 3µA max
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Applications/Uses
- Cellular
- GPS
- Handheld Products
- PDAs
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Key Specifications:
| Battery Protectors, Selectors and Monitors |
| Part Number |
Functions |
Battery Type |
Interface |
Parameters Measured |
VSUPPLY
(V) |
VSUPPLY
(V) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
Budgetary Price |
| min |
max |
max w/pins |
See Notes |
| DS2745 |
Fuel Gauge |
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2-Wire |
| Current | | Temperature | | Voltage |
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2.5 |
5.5 |
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16.2 |
-40 to +85 |
$1.60 @1k |
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See All Battery Protectors, Selectors and Monitors (29)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Block Diagram
More Information
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Information Index
Document Ref.: 19-4631
Rev 2;
2009-06-22
This page last modified: 2010-05-27
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