Single Board with Two Devices BMA8420 and TAA3033

RDA8420TEIS0
Preproduction
  • This page contains information on a preproduction product. Specifications and information herein are subject to change without notice. For additional information please contact your sales representative.

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The RDA8420TEIS0 is a single board with two devices capable of electrochemical impedance spectroscopy (EIS)—using the BMA8420 and TAA3033. This board uses the DC-link capacitor as a reservoir for storing and sourcing the energy for EIS.

The advantage of using the DC-link capacitor is that is provides an EIS solution solely within the battery management system (BMS), eliminating the need for the onboard charger and the traction inverter. The EIS excitation frequency is determined by the BMA8420 controller and is applied to the gate drivers on the board.

The current running to and from the DC-link capacitor is regulated by the TAA3033 controller. The sense resistor defines the amplitude of the excitation current.

Block Diagram

RDA8420TEIS0

RDA8420TEIS0 Block Diagram
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Supported Devices

Battery Management

Battery Sensors

  • BMA8420: Battery Junction Box Monitor IC with EIS Capability
  • TAA3033: TAA3033 Active Precharge Controller IC

Features

Hardware Functionality

  • Precharge and discharge function of DC-link capacitor
  • Generation of EIS excitation currents

Precise Voltage Measurement

  • Two independent precision voltage measurement channels

Pyrotechnic Switch Controller (PSC) Components

  • Two independent controllers including driver stage
  • Optimal triggering speed by the event manager without microcontroller unit (MCU) processing

Communication Capabilities

  • Primary serial peripheral interface (SPI) host interface and inter-integrated circuit (I²C) host interface
  • MCU host controller supporting SPI or transport protocol link 2 (TPL2)

Documentation

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Related Hardware

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Software

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