Overview
The ADBMS1818ASWZ-R7, produced by Analog Devices Inc., is a multicell battery stack monitor designed to measure up to 18 series-connected battery cells. This device is highly accurate, with a total measurement error of less than 3.0 mV, making it suitable for most battery chemistries. The ADBMS1818 features a stackable architecture, allowing for the monitoring of long, high-voltage battery strings, and includes an isoSPI interface for high-speed, RF-immune, long-distance communications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Cell Measurement Range | 0 | - | 5 | V |
| Total Measurement Error (TME) | - | - | 3.0 | mV |
| Measurement Time for 18 Cells | - | - | 290 µs | - |
| Digital Supply Voltage (VREGD) | 2.7 | 3 | 3.6 | V |
| Discharge Switch On Resistance | 4 | - | 10 | Ω |
| Thermal Shutdown Temperature | - | - | 150 | °C |
| Sleep Mode Current Consumption | 6 | - | - | µA |
| ADC Clock Frequency (fS) | 3.3 | - | - | MHz |
Key Features
- Measures up to 18 battery cells in series with high accuracy.
- Stackable architecture for monitoring long, high-voltage battery strings.
- Built-in isoSPI interface for high-speed, RF-immune, long-distance communications.
- Passive balancing with individual pulse-width modulation (PWM) duty cycle control for each cell.
- On-board 5 V regulator and nine general-purpose I/O lines.
- Sleep mode with reduced current consumption to 6 µA.
- Powered directly from the battery stack or from an isolated supply.
Applications
The ADBMS1818 is designed for use in various battery management systems, particularly in applications requiring the monitoring of multiple series-connected battery cells. This includes electric vehicles, renewable energy systems, industrial power systems, and any high-voltage battery stack applications.
Q & A
- What is the maximum number of battery cells the ADBMS1818 can measure? The ADBMS1818 can measure up to 18 series-connected battery cells.
- What is the total measurement error of the ADBMS1818? The total measurement error is less than 3.0 mV.
- How long does it take to measure all 18 cells? All 18 cells can be measured in 290 µs.
- What is the cell measurement range of the ADBMS1818? The cell measurement range is from 0 V to 5 V.
- Does the ADBMS1818 support daisy chain configuration? Yes, multiple ADBMS1818 devices can be connected in a daisy chain configuration.
- What communication interface does the ADBMS1818 use? The ADBMS1818 uses an isoSPI interface for high-speed, RF-immune communications.
- Can the ADBMS1818 be powered from the battery stack? Yes, the ADBMS1818 can be powered directly from the battery stack or from an isolated supply.
- What is the current consumption in sleep mode? The current consumption in sleep mode is reduced to 6 µA.
- Does the ADBMS1818 have on-board voltage regulation? Yes, it includes an on-board 5 V regulator.
- How many general-purpose I/O lines does the ADBMS1818 have? The ADBMS1818 has nine general-purpose I/O lines.
