ADBMS18181

Data Sheet ADBMS1818 18-Cell Battery Monitor with Daisy Chain Interface FEATURES ► Measures up to 18 battery cells in series ► 3 mV maximum total measurement error ► Stackable architecture for high voltage systems ► Built-in isoSPI interface ► 1 Mb isolated serial communications ► Uses a single twisted pair, up to 100 meters ► Low EMI susceptibility and emissions ► Bidirectional for broken wire protection ► 290 µs to measure all cells in a system ► Synchronized voltage and current measurement ► 16-bit Δ-Σ ADC with programmable third-order noise filter ► Passive cell balancing up to 200 mA (maximum) 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 ► 6 µA sleep mode supply current ► 64-lead LQFP_EP package APPLICATIONS ► Backup battery systems ► Grid energy storage ► Residential energy storage ► UPS ► High power portable equipment TYPICAL APPLICATION CIRCUIT Figure 1. Typical Application Circuit Figure 2. Cell 18 Measurement Error vs. Temperature GENERAL DESCRIPTION The ADBMS18181 is a multicell battery stack monitor that measures up to 18 series connected battery cells with a total measurement error (TME) of less than 3.0 mV. The cell measurement range of 0 V to 5 V makes the ADBMS1818 suitable for most battery chemistries. All 18 cells can be measured in 290 µs, and lower data acquisition rates can be selected for high noise reduction. Multiple ADBMS1818 devi...