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BQ2040
- Provides accurate measurement of available charge in NiCd, NiMH, and Li-Ion batteries
- Supports SBS v1.0 data set and two-wire interface
- Monitors charge FET in Li-Ion pack protection circuit
- Designed for battery pack integration
- Low operating current
- Complete circuit can fit on less than 3/4 square inch of PCB space - Supports SBS charge control commands for NiCd, NiMH, and Li-Ion
- Drives a four-segment LED display for remaining capacity indication
- 16-pin narrow SOIC
The bq2040 Gas Gauge IC With SMBus Interface is intended for battery-pack or in-system installation to maintain an accurate record of available battery charge. The bq2040 directly supports capacity monitoring for NiCd, NiMH, and Li-Ion battery chemistries.
The bq2040 uses the System Management Bus v1.0 (SMBus) protocol and supports the Smart Battery Data (SBData) commands. The bq2040 also supports the SBData charge control functions. Battery state-of-charge, remaining capacity, remaining time, and chemistry are available over the serial link. Battery-charge state can be directly indicated using a four-segment LED display to graphically depict battery full-to-empty in 25% increments.
The bq2040 estimates battery self-discharge based on an internal timer and temperature sensor and user-programmable rate information stored in external EEPROM. The bq2040 also automatically recalibrates or \x93learns\x94 battery capacity in the full course of a discharge cycle from full to empty.
The bq2040 may operate directly from three nickel chemistry cells. With the REF output and an external transistor, a simple, inexpensive regulator can be built to provide VCC for other battery cell configurations.
An external EEPROM is used to program initial values into the bq2040 and is necessary for proper operation.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | Gas Gauge IC With SMBus Interface datasheet | 1999年 9月 5日 | |
| Application note | Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) | PDF | HTML | 2019年 7月 12日 | |
| Application note | bq2040-D111 to bq2040-C408 Change List | 2003年 10月 20日 | ||
| User guide | bq2040 EVM | 2000年 4月 10日 | ||
| User guide | bq2040 SBS v1.0 Gas Gauge Demonstration Module | 2000年 4月 10日 | ||
| Application note | U-513 Using the bq2040, Smart Battery System Gas Gauge IC | 1999年 9月 5日 |
設計與開發
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訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點