The Texas Instruments bq28550-R1 battery gas gauge provides current and voltage protection, and secure, SHA-1/HMAC authentication for single-cell Lithium-Ion battery packs. Designed for battery-pack integration, the bq28550-R1 requires host microcontroller firmware support for implementation. A system processor communicates with the bq28550-R1 using a serial interface to obtain remaining battery capacity, system run-time predictions, and other critical battery information.
The bq28550-R1 gas gauge uses an accurate gas gauging algorithm to report the status of the cell. The gauge provides information such as state-of-charge (%), run-time-to-empty (min.), charge-time to full (min.), battery voltage (V), and pack temperature (°C).
The bq28550-R1 gas gauge also features integrated support for secure battery-pack authentication, using the SHA-1/HMAC authentication algorithm.
|Part number||Order||Number of series cells||Cell chemistry||Battery capacity (Max) (mAh)||Communication interface||Battery capacity (Min) (mAh)||External capacity indication||Implementation||Gas gauge algorithm||Features||Operating temperature range (C)||Package Group||Package size: mm2:W x L (PKG)|
||Single Cell||Li-Ion/Li-Polymer||6000||SMBus||300||None||Pack||CEDV||SHA-1 Authentication||-40 to 85||SON | 12||12SON: 10 mm2: 2.5 x 4 (SON | 12)|
|BQ28400||Samples not available||2-4 Cells||Li-Ion/Li-Polymer||32000||SMBus||500||Pack||CEDV||-40 to 85||TSSOP | 20||20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)|