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BQ28550 Datasheet

Part NameBQ28550 TI
Texas Instruments TI
DescriptionSingle Cell Li-Ion Battery Gas Gauge and Protection
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Description
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.

Features
• A Comprehensive Single-Cell Li-Ion Battery Gas
   Gauge and Protection Integrates All Essential
   Functions:
   – Low-Side N-CH FET Protection Control
   – JEITA/Enhanced Charging
   – Authentication
• Records Battery Gas Gauge Information
• Protection Functions Help to Prevent:
   – Short-Circuit
   – Overcurrent Charge and Discharge
   – Overvoltage Charge (Overcharge)
   – Undervoltage (Over-Discharge)
• Firmware Control of Discharge FET
• SHA-1/HMAC Battery Authentication
• General Purpose I/O Configurable for One of the
   Following:
   – CFET Control
   – ALERT Output
• I2C Communications Interface with SBS
   Command Set Operation
• 12-pin, 2.50-mm x 4.00-mm SON Package

Applications
• Tablet PCs
• Slates
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players

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