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Analog Devices Inc. ADBMS1818ASWZ
- Part No.:
- ADBMS1818ASWZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 64-LQFP Exposed Pad
- Datasheet:
-
ADBMS1818ASWZ.pdf
- Description:
- 18-CELL BATTERY MONITOR WITH DAI
- Quantity:
- Payment:
- Shipping:
Inventory:1,196
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Product details
Overview
ADBMS1818ASWZ from Analog Devices is a 18-cell battery monitor IC for high-voltage battery stacks, featuring ±3 mV total measurement error, isoSPI daisy-chain interface (1 Mb/s), and passive cell balancing up to 200 mA per cell. It operates across –40°C to +85°C in 64-lead LQFP_EP package and supports synchronized voltage/current acquisition in 290 µs for grid energy storage and UPS systems.
For engineers reviewing the ADBMS1818ASWZ datasheet, ADBMS1818ASWZ pinout, ADBMS1818ASWZ application, or ADBMS1818ASWZ equivalent, key selection factors include stackable isoSPI architecture, 16-bit Δ-Σ ADC with programmable noise filtering, 9 GPIO/analog inputs, 6 µA sleep current, and compliance with high-reliability battery management requirements in industrial and backup power systems.
Technical Context
The ADBMS1818ASWZ implements a stackable multicell monitoring architecture using isolated isoSPI communication-bidirectional by design to maintain link integrity during wire faults. Its 16-bit Δ-Σ ADC supports three acquisition modes: Fast (±12.5 mV TME), Normal (±3.0 mV TME), and Filtered (±1.8 mV TME at 3.3 V), with configurable third-order digital noise filtering.
Each device integrates an on-chip 5 V regulator, nine general-purpose I/Os configurable as analog inputs or I²C/SPI masters, and independent PWM-controlled discharge switches (4–10 Ω RDS(on)) for passive balancing. Power delivery flexibility includes direct battery-stack biasing or isolated supply input, with thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell count | Monitors up to 18 series-connected cells-enables single-IC coverage of common Li-ion/NMC battery strings in residential ESS and UPS. |
| Total measurement error | ±3.0 mV max in Normal mode-guarantees <0.1% accuracy across 0–5 V cell range for precise state-of-charge estimation. |
| isoSPI data rate | 1 Mb/s bidirectional daisy chain-supports >100 m cable runs with RF immunity and broken-wire fault tolerance. |
| ADC resolution & architecture | 16-bit Δ-Σ with programmable third-order filter-enables selectable trade-off between speed (290 µs full scan) and noise rejection. |
| Sleep supply current | 6 µA at VREG = 5 V-minimizes quiescent drain during standby in always-on BMS applications. |
| Passive balancing current | Up to 200 mA per cell with individual PWM duty control-allows fine-grained thermal management during equalization. |
| Operating temperature | –40°C to +85°C junction-validated for industrial-grade deployment in grid-tied and backup power environments. |
| Package | 64-lead LQFP_EP (SW-64-2) with exposed pad tied to V−-provides low θJC = 2.5°C/W for reliable thermal dissipation. |
Pinout & Package
Package: 64-lead LQFP_EP (SW-64-2), 10 mm × 10 mm, 0.5 mm pitch, exposed thermal pad connected to V−.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Main supply input | Accepts 16–90 V stack voltage; powers internal circuitry and enables direct battery-stack operation without auxiliary supply. |
| V− | Reference ground | System ground reference for all cell measurements; must connect to exposed thermal pad for thermal and electrical integrity. |
| C0–C18 | Cell voltage inputs | Differential inputs measuring voltage across each of 18 cells; C0 = bottom cell (V− referenced), C18 = top cell (V+ referenced). |
| S1–S18 | Discharge switch terminals | Source connections for integrated balancing FETs; each paired with corresponding C(n) for per-cell passive discharge control. |
| IPA/IMA/IPB/IMB | isoSPI differential pairs | Two isolated differential interfaces supporting bidirectional daisy chaining; IPA/IMA for upstream, IPB/IMB for downstream direction. |
| DRIVE | Regulator output | 5 V regulated output (15 mA typical) powering external circuitry or cascaded ADBMS1818ASWZ devices' VREG pins. |
| GPIO1–GPIO9 | Configurable I/O | Can serve as analog inputs (0–5 V), digital I/O, or I²C/SPI master signals-enables sensor interfacing and system-level control without extra ICs. |
| ISOMD | isoSPI mode select | Configures isoSPI interface directionality (0 = unidirectional, 1 = bidirectional); critical for fault-tolerant communication path design. |
Key Features
| Feature | Design Value |
|---|---|
| Stackable isoSPI daisy chain | Enables monitoring of 100+ cells with one host MCU connection and no additional isolation components-reduces BOM cost and PCB area. |
| Programmable ADC noise filtering | Third-order digital filter configurable per acquisition mode-delivers 1.8 mV TME in Filtered mode for ultra-low-noise applications like precision SoC estimation. |
| Independent cell balancing control | Per-cell PWM duty cycle programming allows dynamic balancing current adjustment-prevents localized overheating and extends cell lifetime. |
| Bidirectional communication fault tolerance | Automatic path reversal on open-wire detection maintains data flow-eliminates single-point failure risk in long-string battery packs. |
| Integrated 5 V regulator | 15 mA DRIVE output powers downstream peripherals or adjacent ADBMS1818ASWZ VREG pins-removes need for external LDO in multi-device stacks. |
| Low-power sleep mode | 6 µA supply current with isoSPI idle-enables periodic wake-up architectures for energy-constrained remote BMS nodes. |
Applications
| Grid Energy Storage | Residential Energy Storage |
|---|---|
|
Use Scenario: Monitoring 48–96 V lithium iron phosphate (LiFePO₄) battery strings in utility-scale inverters with >10-year field life requirements. IC Role / Device Role / Timing Role: Primary cell voltage and temperature monitor; performs synchronized 290 µs full-stack acquisition every 100 ms for real-time SoH analysis. Use Value: ±3 mV TME ensures <0.06% SoC error over full 0–5 V range-critical for predictive maintenance and warranty analytics in revenue-grade ESS. |
Use Scenario: Compact BMS in wall-mounted home battery systems (e.g., 48 V, 10–20 kWh) requiring UL 1973 compliance and silent operation. IC Role / Device Role / Timing Role: Central measurement unit with integrated balancing and 9-channel GPIO for thermistor/pressure sensing; operates in Filtered mode for low EMI. Use Value: 6 µA sleep current and passive balancing reduce self-discharge to <0.5% monthly-preserves charge during grid-out events without auxiliary power. |
| Uninterruptible Power Supply (UPS) | High-Power Portable Equipment |
|
Use Scenario: 24–48 V lead-acid or Li-ion backup systems in telecom cabinets where rapid fault detection (<10 ms) prevents downtime. IC Role / Device Role / Timing Role: Real-time cell supervision with watchdog timer and open-wire diagnostics; uses Fast mode (970 µs full scan) for sub-millisecond response. Use Value: Bidirectional isoSPI maintains communication even after cable cut-ensures continuous status reporting during physical infrastructure failures. |
Use Scenario: Battery packs for electric power tools or medical carts requiring ruggedized BMS with minimal footprint and thermal headroom. IC Role / Device Role / Timing Role: Multifunction monitor providing cell voltages, pack temperature via GPIO analog inputs, and balancing control-all within single 10 mm × 10 mm LQFP_EP. Use Value: Exposed-pad LQFP_EP package achieves θJC = 2.5°C/W-keeps junction temperature <85°C under 200 mA continuous balancing at 40°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6813-1 | 12-cell monitor; 2.5 mV TME; SPI-only interface (no isoSPI); 44-pin LQFP | Requires external isolators for high-voltage stacks; limited to ≤12 cells per IC-increases component count for 18-cell systems. | Select when system voltage ≤60 V and daisy-chain isolation is implemented externally; not drop-in compatible with ADBMS1818ASWZ pinout or firmware. |
| BQ76952 | 16-cell monitor; I²C/SPI interface; integrated protection FET drivers; 6 mm × 6 mm QFN | Includes built-in charge/discharge FET control but lacks isoSPI-requires signal isolators for >60 V stacks and adds layout complexity. | Prefer for space-constrained designs needing integrated protection logic; requires redesign of communication layer and balancing circuitry vs. ADBMS1818ASWZ. |
Compared with LTC6813-1 and BQ76952, the ADBMS1818ASWZ uniquely combines 18-cell capacity, isoSPI integration, and ±3 mV accuracy in a single package-reducing isolation BOM, simplifying stack scalability, and eliminating inter-IC timing skew in multi-device systems.
Availability
ADBMS1818ASWZ is available at Aetrix Electronics and suitable for grid energy storage, residential energy storage, and uninterruptible power supply (UPS) systems requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for ADBMS1818ASWZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.
The ADBMS1818ASWZ belongs to Analog Devices' Battery Management IC product line, engineered specifically for high-voltage, high-reliability battery monitoring in energy infrastructure and mission-critical backup systems.
FAQ
What is the maximum number of ADBMS1818ASWZ devices that can be daisy-chained?
The ADBMS1818ASWZ supports unlimited daisy-chaining via its isoSPI interface, with practical limits determined by total loop delay and noise margin. Each device adds ~300 ns daisy-chain delay (tDSY(D)), allowing >50 devices in a single chain while maintaining 1 Mb/s throughput and bidirectional fault recovery-verified in Analog Devices' ADBMS1818 reference designs for >1000-cell systems.
Does ADBMS1818ASWZ support both lithium-ion and lead-acid battery chemistries?
Yes, ADBMS1818ASWZ supports 0 V to 5 V per cell measurement range-covering nominal 3.2 V LiFePO₄, 3.6 V NMC/NCA, and 2.0–2.4 V lead-acid cells. Its ±3 mV total measurement error remains valid across this full input range and –40°C to +85°C, enabling chemistry-agnostic BMS firmware across diverse energy storage applications.
How does the ADBMS1818ASWZ handle open-wire detection on cell inputs?
The ADBMS1818ASWZ performs active open-wire detection by injecting 100 µA (typical) current into each C(n)/S(n) pair during measurement cycles. Voltage response is compared against thresholds; detection completes within one normal-mode acquisition (2.34 ms). Results are reported in the FAULT register and trigger isoSPI alert packets-enabling immediate host intervention without external circuitry.
Can ADBMS1818ASWZ operate without an external 5 V supply?
Yes, ADBMS1818ASWZ can be powered directly from the monitored battery stack (V+ to V− = 16–90 V) using its internal charge pump and linear regulator. The DRIVE pin delivers 5 V at up to 15 mA, sufficient to power its own digital core and adjacent ADBMS1818ASWZ VREG pins-eliminating need for external regulators in stacked configurations.
What is the thermal performance of ADBMS1818ASWZ in continuous balancing operation?
With the exposed pad soldered to a 4-layer PCB's internal V− plane, ADBMS1818ASWZ achieves θJC = 2.5°C/W. At 200 mA balancing current per cell (worst-case), power dissipation is ~0.4 W per device. This yields <10°C junction-to-case rise above ambient-keeping TJ < 85°C at 40°C ambient, well within the –40°C to +85°C specification limit for ADBMS1818ASWZ.
ADBMS1818ASWZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 18
- Fault Protection:
- Over Temperature, Over/Under Voltage
- Interface:
- SPI
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q200
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP-EP (10x10)
ADBMS1818ASWZ FAQ
1.How can I place an order for ADBMS1818ASWZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADBMS1818ASWZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADBMS1818ASWZ reliable?
The price and inventory of ADBMS1818ASWZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADBMS1818ASWZ is usually 5 days.
3.What payment methods are accepted for ADBMS1818ASWZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADBMS1818ASWZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADBMS1818ASWZ?
ADBMS1818ASWZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADBMS1818ASWZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADBMS1818ASWZ?
For technical support, including ADBMS1818ASWZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADBMS1818ASWZ requirements.
6.How does Aetrix verify that ADBMS1818ASWZ is sourced from the original manufacturer or authorized distributors?
All ADBMS1818ASWZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADBMS1818ASWZ meets industry standards.
7.What is the process for return or replacement of ADBMS1818ASWZ?
All ADBMS1818ASWZ units undergo pre-shipment inspection (PSI). If there is an issue with ADBMS1818ASWZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADBMS1818ASWZ part is unused and in its original packaging.
Return procedure for ADBMS1818ASWZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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