Overview
Description
Renesas’ daisy chainable 14-cell battery front-end is ideal for high voltage, stacked battery systems. The RAA489204 is a 14-cell battery front-end (BFE) IC, an essential component of any battery management system (BMS), which periodically scans battery status and the operating environment to optimize battery life and prevent catastrophic failures. The part provides accurate monitoring, cell balancing, and extensive system diagnostics functions. Cell balancing can be conducted either internally or externally, with 10V gate pins for external balancing.
The RAA489204 Li-ion battery manager IC supervises up to 14 series connected cells. The part provides accurate monitoring, cell balancing, and extensive system diagnostics functions. Three cell balancing modes are provided: Manual Balancing mode, Timed Balancing mode, and Auto Balance mode. The Auto Balance mode terminates balancing functions when a charge transfer value has been met. The RAA489204 communicates to a host microcontroller via an SPI interface and to other RAA489204 devices using a robust, proprietary, two-wire daisy chain system. The RAA489204 is offered in a 64 Ld TQFP package and is specified for an operational temperature range of -40 °C to +85 °C.
Features
- Robust daisy-chain communications system
- Daisy-chain supports both capacitive and transformer connected communications
- Up to 14-cell voltage monitors, support Li-ion CoO2, Li-ion Mn2O4, and Li-ion FePO4 chemistries
- Cell voltage measurement accuracy ±10mV
- 14-bit voltage and temperature measurements
- Internal temperature monitoring
- Up to six external temperature inputs
- Integrated system diagnostics for all key internal functions
- Hardwired and communications based fault notification
- Integrated watchdog shuts down the device if communication is lost
- 10µA shutdown current: Enable = VSS
- 2.5Mbps SPI
Comparison
Applications
Design & Development
Sample Code
Boards & Kits
Evaluation
RTKA489204DK0000BU
Active
Multi-Cell Daisy-Chainable Li-Ion Battery Manager Evaluation Kit
The RTKA489204DK0000BU evaluation kit includes eval board, dongle, cables and GUI and is used to evaluate the features of the RAA489204 14-cell battery front end (BFE) IC. Additionally, RTKA489204DE0000BU eval boards can be purchased/added separately if needed for daisy chaining.
The...
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Reference Designs
US134-118VBTPKEV1Z
Active
20-28 Cell Battery Management System up to 118V Reference Design
The US134-118VBTPKEV1Z board demonstrates a proof of concept (POC) solution for a 20-28 cell battery management system (BMS). The board supports a wide input range of 40V-120V and output of 40V-118V with 20A of continuous discharge current and can be increased to 60A with additional thermal...
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Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
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Videos & Training
RAA48920x Multi-Cell Battery Front End Family
An overview of how the Renesas multi-cell battery front devices streamline development for high-cell count, high-voltage systems with flexible cell balancing and lower system costs. Visit renesas.com/bfe for more details.
Video List
