16-Channel Multicell Battery Monitor

The ADES1830/ADES1831 are multicell battery stack monitors that measures up to 16 series connected battery cells with a lifetime total measurement error (TME) of less than 2 mV for the ADES1830 and less than 5 mV for the ADES1831 over the full temperature range. The measurement input range of −2 V to +5.5 V makes the ADES1830/ADES1831 suitable for most battery chemistries and allows measurement of voltages across bus bars. Provisions are made for bypassing bus bars without dedicating any measurement channels.

All cells can be measured simultaneously and redundantly with two individual analog-to-digital converters (ADCs). The continuously operating ADCs with a high sampling rate of 4.096 MHz allow reduced external analog filtering and aliasing free measurement results. Higher noise reduction can be achieved by subsequent programmable infinite impulse response (IIR) filters.

Multiple ADES1830/ADES1831 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each ADES1830/ADES1831 has an isolated serial port interface (isoSPI™) for high speed, RF immune, long distance communications. Multiple devices are connected in a daisy chain with one host processor connection. This daisy chain can be operated bidirectionally, ensuring communication integrity even in the event of a fault along the communication path.

The ADES1830/ADES1831 can be powered from the battery stack or an isolated supply. The ADES1830/ADES1831 include passive balancing with individual pulse width modulation (PWM) duty cycle control and up to 300 mA discharge current for each cell. Other features include an on-board 5 V regulator, up to 9 general-purpose inputs/outputs, and a sleep mode, where current consumption is reduced to 4 μA.

APPLICATIONS

* Utility energy storage

* Commercial and Industrial energy storage

* Residential energy storage

* Backup battery systems

* Measures up to 16 battery cells in series

* Maximum lifetime TME: ±1.8 mV at 3.3 V per cell for ADES1830 and ±5 mV for ADES1831 (–40°C to +105°C)

* Simultaneous and continuous measurement of cell voltages

* Configurable integrated low-pass filtering

* Stackable architecture for high voltage battery packs

* Built-in isoSPI

* 2 Mbps isolated serial communications

* Uses a single twisted pair, up to 20 meters per segment

* Low EMI susceptibility and emissions

* Bidirectional for broken wire protection

* Capacitor or transformer-coupled