6.2.1. Interface MAX17841B v1.0.0

Note

The design for this interface is not complete. If you are interested in a design, please contact us.

6.2.1.1. Overview

Important

The following description only applies for the MAX17841B-based BMS-Interface Board hardware version 1.0.0.

Hint

All connector pinouts described below follow the Convention for Molex Micro-Fit 3.0 Connector Pin Numbering and Convention for Samtec Edge Rate connectors.

The BMS-Interface Board is used to enable communication between the BMS-Master Board and the BMS-Slave Boards. The BMS-Interface Board is intended to be used together with a BMS-Master Board.

6.2.1.2. Specifications

6.2.1.2.1. Mechanical Dimensions

The size of the PCB is 70 mm x 120 mm.

6.2.1.2.2. Battery Management UART Insulation

The interface board is designed for a maximum continuous insulation voltage of 1250 V DC between all two Maxim Battery Management UART channels and between each Maxim Battery Management UART channel and the BMS-Master Board.

The insulation is designed according to DIN EN 60664-1:2008-01 under the following conditions:

  • Type of insulation: functional

  • Electrical field: homogeneous

  • Pollution degree: 2

  • PCB insulator class: 3b

  • Transient voltage: 4300 V DC

  • Continuous (working) voltage: 1250 V DC (selected due to design space constraints on PCB)

The PCB design complies with the following parameters:

  • Clearance: 1.3 mm

  • Creepage distance: 12.5 mm

6.2.1.2.3. Maxim Battery Management UART communication

The BMS-Interface Board offers up to two isolated Maxim Battery Management UART communication channels using the MAX17841B transceiver chip from Maxim Integrated. The MAX17841B transceivers are controlled by the SPI signals from the BMS-Master Board.

For the connection to the BMS-Master Board, a 40-pole mezzanine connector (J100) is used.