The bq2018 is a low-cost charge/discharge counter peripheral packaged in an 8-pin TSSOP or SOIC. It works with an intelligent host controller, providing state-of-charge information for rechargeable batteries.
The bq2018 measures the voltage drop across a low-value series sense resistor between the negative terminal of the battery and the battery pack ground contact. By using the accumulated counts in the charge, discharge, and self-discharge registers, an intelligent host controller can determine battery state-of-charge information. To improve accuracy, an offset count register is available. The system host controller is responsible for the register maintenance by resetting the charge in/out and self-discharge registers as needed.
The bq2018 also features 128 bytes of NVRAM registers. The upper 13 bytes of NVRAM contain the capacity monitoring and status information. The RBI input operates from an external power storage source such as a capacitor or a series cell in the battery pack, providing register nonvolatility for periods when the battery is shorted to ground or when the battery charge state is not sufficient to operate the bq2018. During this mode, the register backup current is less than 100nA.
Packaged in an 8-pin TSSOP or SOIC, the bq2018 is small enough to fit in the crevice between two A-size cells or within the width of a prismatic cell.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | Power Minder | 05 Sep 1999 | |
| Application note | Gas Gauging Basics Using TI Battery Monitor ICs (Rev. A) | 17 Oct 2003 | ||
| Application note | Advanced Gas Gauge Firmware Flowchart for TI Battery Monitor ICs | 28 Aug 2002 | ||
| Application note | Advanced Gas Gauge Host Firmware for TI Battery Monitor ICs | 16 May 2001 | ||
| Application note | HDQ Communication Basics for TI Battery Monitor ICs | 16 May 2001 | ||
| User guide | bq2018 EVM | 10 Apr 2000 | ||
| User guide | bq2018 Power Minder | 10 Apr 2000 | ||
| User guide | DM2382 Gas Gauge Peripheral and Li-Ion Pack Protection Demo Board | 05 Sep 1999 | ||
| Application note | Designed to Go: Universal Battery Monitor Using the bq2018 Power Minder IC | 05 Sep 1999 | ||
| User guide | EV2200-18 Evaluation System User Guide | 05 Sep 1999 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
| TSSOP (PW) | 8 | View options |
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