This solution is designed for a 20-28 cells battery management system (BMS) aimed at domestic battery-powered generators. The design uses Renesas’ multi-cell, single-IC battery manager in parallel to safely and effectively monitor battery life, as well as cost-optimized system control from the RA family of 32-bit MCUs. This combination creates a system for a battery-pack board capable of managing higher voltages and interfacing with a wide variety of load devices.

System Benefits​:

  • A complete large voltage (40V to 118V) self-contained BMS
  • System health checks/charge measurements
  • External communication port (RS-485)
  • Design is capable of passing common safety regulations




  • Large powered motors (Chainsaws/HVAC)
  • Home/Solar backup systems
  • Light electric vehicles (LEV)

Winning Combinations Interactive Diagram

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4:3 ratio Sheet.144 Sheet.138 Sheet.1 Sheet.2 Sheet.3 Sheet.4 US134 US134 US134 Buck Regulator Buck Regulator Buck Regulator LDO LDO LDO FET Driver FET Driver FET Driver Load Load Load IGBT Insulated Gate Bipolar Transistor 1 Sheet.35 Sheet.36 Sheet.37 Sheet.38 Sheet.39 IGBT Insulated Gate Bipolar Transistor 1.40 Sheet.41 Sheet.42 Sheet.43 Sheet.44 Sheet.45 Resistor - Fixed Resistor - Fixed.47 Resistor - Fixed.48 Ground (earth) Sheet.50 Sheet.51 Sheet.52 Sheet.53 Sheet.66 Sheet.67 Sheet.68 Sheet.69 Sheet.70 Sheet.71 Ground (earth).117 Sheet.118 Sheet.119 Sheet.120 Sheet.121 Bluetooth Connectivity (Optional) Bluetooth Connectivity (Optional) Bluetooth Connectivity (Optional) PMOD PMOD PMOD Sheet.135 Sheet.136 Sheet.137 Sheet.139 Sheet.140 Sheet.141 Sheet.142 Sheet.143 Sheet.145 Sheet.146 Sheet.147 Ground (earth).148 Sheet.149 Sheet.150 Sheet.151 Sheet.152 Sheet.153 Sheet.155 Sheet.156 Sheet.158 Sheet.159 Sheet.161 Sheet.162 Sheet.163 Sheet.165 Diode Sheet.169 Sheet.170 Sheet.173 Sheet.174 Sheet.175 Sheet.176 Sheet.177 Sheet.178 Sheet.180 Sheet.181 Sheet.182 Sheet.183 Wi-Fi Sheet.194 Sheet.193 Battery 3-Cell Sheet.100 Sheet.101 Sheet.102 Sheet.103 Line 1pt.1552 Line 1pt.1608 Sheet.106 Sheet.107 Sheet.195 Sheet.196 Battery 3-Cell Sheet.198 Sheet.199 Sheet.200 Sheet.201 Line 1pt.1552 Line 1pt.1608 Sheet.204 Sheet.205 Sheet.206 Connector 1.167 Connector 1.167.208 Connector 1.167.209 Sheet.210 Connector 1.211 10-14 Cell Series 10-14 Cell Series 10-14 Cell Series 10-14 Cell Series 10-14 Cell Series 10-14 Cell Series Connector 1.167.214 Connector 1.167.215 Connector 1.167.216 Connector 1.167.217 Daisy Chain Daisy Chain Daisy Chain Connector 1.167.224 Connector 1.167.225 Sheet.267 Sheet.255 Sheet.256 Sheet.257 Sheet.258 Sheet.259 Sheet.260 Sheet.261 Sheet.262 Connector 1.369 Connector 1.370 Connector 1.373 Sheet.266 Connector 1.167.268 Sheet.271 Connector 1.167.273 Sheet.275 Sheet.276 Sheet.278 Sheet.279 Sheet.281 Sheet.290 Sheet.297 Sheet.298 Sheet.299 Sheet.300 Sheet.283 Sheet.284 Sheet.285 Sheet.286 Sheet.287 Sheet.288 Sheet.289 Connector 1.369 Connector 1.370 Connector 1.373 Sheet.294 Sheet.295 Sheet.296 Sheet.301 Sheet.302 Sheet.303 Sheet.304 Sheet.305 Sheet.306 Sheet.307 Sheet.308 Connector 1.369 Connector 1.370 Connector 1.373 Sheet.312 Sheet.313 Sheet.314 Sheet.315 Sheet.316 Sheet.317 Sheet.325 4 4 4 4 Sheet.328 2 2 2 2 Sheet.331 Sheet.333 Connector 1.167.334 Sheet.335 Connector 1.167.336 Sheet.98 Non-Renesas Component.97 Sheet.96 Sheet.80 Sheet.81 Sheet.83 Sheet.84 Sheet.86 Sheet.87 Sheet.92 Sheet.93 2 2 2 2 Sheet.339 Sheet.340 Sheet.341 PMOD PMOD PMOD Sheet.343 Sheet.344 Sheet.345 Sheet.348 Sheet.349 Sheet.350 Battery Pack Battery Pack Battery Pack 2 Communication Lines B.795 2 2 2 4 4 4 4 Sheet.358 2 2 2 2 Sheet.361 3.3V 3.3V 3.3V 3.3V 1mA 3.3V/1mA 3.3V/1mA 12V 1mA 12V/1mA 12V/1mA VPACK VPACK VPACK 3.3V 5.3mA 3.3V/5.3mA 3.3V/5.3mA 3.3V 60mA(max) 3.3V/60mAmax 3.3V/60mAmax 2 2 2 2 Sheet.370 3.3V 3.3V 3.3V Sheet.372 14-Cell BMS 14-Cell BMS 14-Cell BMS REG REG REG SPI/Daisy SPI/Daisy SPI/Daisy Sheet.373 BMS BMS BMS Daisy Daisy Daisy REG REG REG SPI SPI SPI Sheet.374 Power Monitor Power Monitor Power Monitor ALRT ALRT ALRT I2C I2C I2C Sheet.375 MCU 1 MCU MCU GPIO GPIO GPIO GPIO GPIO GPIO SPI SPI SPI 12-bit ADC 12-bit ADC 12-bit ADC UART UART UART UART UART UART INT INT INT I2C I2C I2C Sheet.376 MCU 2 MCU MCU Bluetooth Low Energy Bluetooth Low Energy Bluetooth Low Energy GPIO GPIO GPIO Vdd Vdd Vdd UART UART UART ALRT ALRT ALRT Bluetooth Bluetooth Bluetooth Bluetooth Sheet.377 Transceiver Transceiver Transceiver RS-485 RS-485 RS-485
Exiting Interactive Block Diagram