Analog Devices Inc. EVAL-ADBMS1818 Demonstration Circuit

Analog Devices Inc. EVAL-ADBMS1818 Demonstration Circuit features the ADBMS1818 18-Cell Battery Monitor. The ADBMS1818 18-Cell Battery Monitors measures up to 18 series-connected battery cells with a total measurement error of less than 3mV. A 2-wire isolated serial interface (isoSPI) can link multiple boards to monitor any number of cells in a stack. The EVAL-ADBMS1818 Demonstration Circuit also provides a reversible isoSPI enabling a fully redundant communication path.

The ADI EVAL-ADBMS1818 Demonstration Circuit communicates to a PC by connecting directly to a DC2026 Linduino® One. The DC2026 must be loaded with the appropriate program (called a “sketch”) to control the battery stack monitor IC and receive data through a USB serial port. The DC2792/DC1941 can be connected to the DC2026 to provide a fully isolated isoSPI interface to the EVAL_ADBMS1818.

Features

Measures up to 18 battery cells in series
3mV Maximum total measurement error
Stackable architecture for high voltage systems
Built-In isoSPI™ interface
1Mb Isolated serial communications
Uses a single twisted pair, up to 100 meters
Low EMI susceptibility and emissions
Bidirectional for broken wire protection
290µs to measure all cells in a system

Synchronized voltage and current measurement
16-Bit Delta-Sigma ADC with programmable 3rd order noise filter
Passive cell balancing up to 200mA (max) with programmable pulse-width modulation
9 General purpose digital I/O or analog inputs
Temperature or other sensor inputs
Configurable as an I2C or SPI master
6µA Sleep mode supply current
64-Lead eLQFP package

Required Equipment

PC with USB port
DC2026 Linduino board
USB cable to connect PC to Linduino
14-wire SPI demo board ribbon cable to connect to Linduino (optional)

2 isoSPI twisted-pair patch cords to connect DC2972B to isoSPI BMS demo(s)
Software that controls one or two isoSPI channels (usually intended for demonstrating isoSPI BMS products)