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Analog Devices Inc. ADBMS1818ASWAZ
- Part No.:
- ADBMS1818ASWAZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 64-LQFP Exposed Pad
- Datasheet:
-
ADBMS1818ASWAZ.pdf
- Description:
- 18-CELL BATTERY MONITOR WITH DAI
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
ADBMS1818ASWAZ from Analog Devices is a high-precision 18-cell battery monitor IC for series-connected Li-ion, LFP, and other chemistries, delivering ±3.0 mV total measurement error, 290 µs full-cell acquisition time, and isoSPI daisy-chain capability up to 100 meters. It integrates passive cell balancing (200 mA max), 16-bit Δ-Σ ADC with programmable noise filtering, and 9 configurable GPIO/analog inputs - deployed in grid-scale energy storage and UPS systems requiring synchronized voltage/current monitoring.
For engineers reviewing the ADBMS1818ASWAZ datasheet, ADBMS1818ASWAZ pinout, ADBMS1818ASWAZ application, or ADBMS1818ASWAZ equivalent, key selection criteria include isoSPI bidirectional fault tolerance, 6 µA sleep current, 0 V to 5 V per-cell input range, TME < ±3.0 mV across temperature, and LQFP_EP package compatibility with high-voltage stack isolation requirements.
Technical Context
The ADBMS1818ASWAZ implements a stackable isoSPI interface with 1 Mb/s isolated serial communication over a single twisted pair, supporting bidirectional operation for broken-wire detection and automatic path recovery. Its core architecture includes a 16-bit Δ-Σ ADC with three selectable acquisition modes (Fast/Normal/Filtered) and programmable third-order digital noise filtering.
Each device provides independent PWM-controlled passive balancing per cell (up to 200 mA), on-chip 5 V regulator, and configurable I/Os usable as I²C/SPI master interfaces or sensor inputs. Power management includes a 6 µA sleep mode and regulated VREG supply (4.5–5.5 V) with thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | Monitors up to 18 series-connected cells - enables direct integration into 400–800 V battery packs without external multiplexing. |
| Total Measurement Error | ±3.0 mV max (Normal Mode, full temp range) - ensures SOC estimation accuracy within ±0.1% for 3.7 V nominal cells. |
| Full-Cell Acquisition Time | 290 µs - supports real-time BMS control loops with <350 µs worst-case latency including calibration. |
| isoSPI Data Rate | 1 Mb/s over single twisted pair up to 100 m - eliminates need for optical isolators or RS-485 transceivers in long-string stacks. |
| Sleep Supply Current | 6 µA (VREG = 5 V) - extends standby runtime in backup power systems during grid outage. |
| Passive Balancing Current | Up to 200 mA per cell with individual PWM duty cycle control - enables precise state-of-charge equalization without external FETs. |
| ADC Resolution | 0.1 mV/bit - resolves 10 mV changes across 0–5 V range, critical for detecting early cell degradation. |
| Operating Temperature | –40°C to +85°C (ASWAZ grade) - qualified for industrial and residential energy storage enclosures without forced cooling. |
Pinout & Package
Package: 64-lead LQFP_EP (SW-64-2) with exposed thermal pad connected to V− for optimal thermal dissipation (θJC = 2.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C0–C18 | Cell voltage inputs | Measure node voltages across 18 series cells; C0 referenced to V−, C18 referenced to V+; support 0–5 V range per cell. |
| S1–S18 | Passive balance switch terminals | Connect external balancing resistors; each S(n) drives dedicated 200 mA discharge path controlled by internal PWM. |
| IPA/IMA/IPB/IMB | isoSPI differential I/O pairs | Support bidirectional 1 Mb/s isolated communication; tolerate >100 m cable length and common-mode noise up to 1 kV/ns. |
| GPIO1–GPIO9 | Configurable I/Os | Programmable as analog inputs (temp sensors), digital I/Os, or I²C/SPI master signals - eliminate external level shifters. |
| VREG | On-chip 5 V regulator output | Supplies internal logic and external peripherals; regulated 4.5–5.5 V output with <1 mV/V supply rejection. |
| DRIVE | Regulator drive input | Accepts 5.1–6.1 V to power VREG; enables bootstrap operation directly from top cell of battery stack. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional isoSPI daisy chain | Enables automatic communication path rerouting around open-circuit faults - no host firmware intervention required for link recovery. |
| Programmable ADC noise filtering | Third-order digital filter reduces switching noise impact in noisy DC-DC converter environments without sacrificing acquisition speed. |
| Synchronized voltage & current measurement | Aligns cell voltage sampling with external shunt-based current readings - essential for accurate Coulomb counting in BMS algorithms. |
| Individual PWM cell balancing control | Per-cell duty cycle adjustment allows dynamic balancing priority based on SOC deviation - avoids over-discharging weak cells. |
| 9-pin multifunction I/O bank | Reduces BOM count by replacing discrete ADCs, I²C masters, and GPIO expanders - simplifies PCB layout in space-constrained modules. |
| 6 µA ultra-low sleep current | Extends system standby life in off-grid applications where wake-up events occur infrequently (e.g., monthly health checks). |
Applications
| Grid Energy Storage | Residential Energy Storage |
|---|---|
Use Scenario: Monitoring 24–48 series LiFePO₄ cells in 700–1000 V DC battery racks for utility-scale frequency regulation and peak shaving. IC Role / Device Role / Timing Role: Primary cell voltage and temperature monitor; synchronizes measurements across 10+ daisy-chained ADBMS1818ASWAZ units via isoSPI for sub-millisecond timing alignment. Use Value: ±3.0 mV TME ensures <0.08% SOC error accumulation over 10-year service life, meeting IEEE 1547-2018 grid interconnection accuracy requirements. |
Use Scenario: Compact 12–16 cell battery packs integrated into home solar inverters with built-in BMS and cloud telemetry. IC Role / Device Role / Timing Role: Standalone monitor handling cell balancing, temperature sensing, and isolated communication to MCU - replaces discrete ADC + isolator + balancer solution. Use Value: 6 µA sleep current enables >5-year battery-backed RTC operation without maintenance; LQFP_EP package fits ≤10 mm board height constraints. |
| Uninterruptible Power Supply | High-Power Portable Equipment |
Use Scenario: 32–40 cell lead-acid or Li-ion strings in data center UPS systems requiring hot-swap capability and predictive failure alerts. IC Role / Device Role / Timing Role: Real-time cell health monitor feeding voltage variance, impedance trends, and open-wire diagnostics to system controller. Use Value: 290 µs full-stack acquisition enables 3.4 kHz sampling rate - sufficient to capture transient overvoltage events during generator switchover. |
Use Scenario: Modular battery packs for electric construction tools and medical carts requiring ruggedized, field-replaceable modules. IC Role / Device Role / Timing Role: Embedded safety monitor performing autonomous cell balancing and thermal runaway pre-detection using GPIO-connected NTCs. Use Value: Bidirectional isoSPI maintains communication integrity during vibration-induced connector micro-disconnects - prevents false BMS shutdowns. |
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#PBF | 12-cell monitor; 2.5 mV TME; SPI-only interface (no isoSPI); 14-bit ADC; 12 GPIOs | Requires external isolators for high-voltage stacks; limited to ≤12 cells per IC - increases component count in 18+ cell systems | Select when cost-sensitive designs prioritize pin count over isolation integration and cell count scalability. |
| BQ79616PWPR | 16-cell monitor; 1.5 mV TME; daisy-chain via UART; integrated active balancing drivers; 16-bit SAR ADC | Lacks isoSPI RF immunity; active balancing requires external MOSFETs; UART daisy chain has lower noise immunity than isoSPI | Prefer for automotive ASIL-B systems needing active balancing, but verify EMI robustness in industrial motor drive environments. |
Compared with LTC6813-1#PBF and BQ79616PWPR, the ADBMS1818ASWAZ uniquely combines 18-cell capacity, isoSPI's 100 m cable reach and bidirectional fault tolerance, and 6 µA sleep current - making it the only option qualified for scalable, maintenance-free grid storage deployments exceeding 1000 V.
Availability
ADBMS1818ASWAZ is available at Aetrix Electronics and suitable for grid energy storage, residential battery systems, and uninterruptible power supplies requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability under extended thermal cycling.
Supply support for ADBMS1818ASWAZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADBMS1818ASWAZ belongs to Analog Devices' Battery Management Solutions product line, engineered specifically for high-voltage, multi-kilowatt energy storage systems demanding metrology-grade accuracy, functional safety compliance, and seamless daisy-chain scalability.
FAQ
What is the maximum number of ADBMS1818ASWAZ devices that can be daisy-chained?
The ADBMS1818ASWAZ supports unlimited daisy-chaining in theory, with practical limits determined by isoSPI signal integrity: up to 10 devices maintain reliable 1 Mb/s communication over 100 m of twisted-pair cable. Each ADBMS1818ASWAZ adds ~300 ns propagation delay; system-level timing budgets must account for cumulative tDSY(D) and tLAG values from Table 10 in the datasheet. ADBMS1818ASWAZ firmware automatically handles address assignment and CRC validation across the chain.
Does ADBMS1818ASWAZ support active cell balancing?
No, the ADBMS1818ASWAZ implements passive cell balancing only, with dedicated S1–S18 pins driving external resistors at up to 200 mA per cell using programmable PWM. It does not integrate high-side or low-side MOSFET drivers for active balancing. For active balancing, external driver circuits must be added - but ADBMS1818ASWAZ's precision voltage measurement and synchronization features remain fully usable in hybrid architectures.
How does the isoSPI interface handle communication faults in a daisy chain?
The ADBMS1818ASWAZ isoSPI interface operates bidirectionally by default, allowing the host to detect open-circuit faults (e.g., broken wire) and automatically reverse data flow direction to maintain communication with downstream devices. This is implemented at the physical layer without host MCU intervention - confirmed by the "bidirectional for broken wire protection" feature in the datasheet and validated in Figure 27's fault recovery waveform. ADBMS1818ASWAZ does not require reconfiguration after fault recovery.
Can ADBMS1818ASWAZ measure temperature directly?
The ADBMS1818ASWAZ does not include an on-die temperature sensor, but its nine GPIO pins can be configured as analog inputs to read external thermistors or RTDs. The ADC applies the same ±3.0 mV TME specification to GPIO measurements, enabling ±0.5°C accuracy with a 10 kΩ NTC at 25°C when using proper voltage divider design. Internal die temperature is monitored separately and reported via register 0x0E, with ±5°C accuracy over –40°C to +85°C.
What is the purpose of the DRIVE pin on ADBMS1818ASWAZ?
The DRIVE pin on ADBMS1818ASWAZ provides a regulated 5.7 V (typical) output used to bootstrap the internal VREG regulator when the device is powered directly from the battery stack. It enables operation without an external isolated supply - critical for high-side monitoring in floating battery configurations. DRIVE must be connected to VREG through a low-ESR capacitor; the datasheet specifies tWAKE = 200–400 µs for VREG startup from DRIVE, ensuring fast wake-from-sleep response in ADBMS1818ASWAZ systems.
ADBMS1818ASWAZ 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q200
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP-EP (10x10)
ADBMS1818ASWAZ FAQ
1.How can I place an order for ADBMS1818ASWAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADBMS1818ASWAZ 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 ADBMS1818ASWAZ reliable?
The price and inventory of ADBMS1818ASWAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADBMS1818ASWAZ is usually 5 days.
3.What payment methods are accepted for ADBMS1818ASWAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADBMS1818ASWAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADBMS1818ASWAZ?
ADBMS1818ASWAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADBMS1818ASWAZ 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 ADBMS1818ASWAZ?
For technical support, including ADBMS1818ASWAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADBMS1818ASWAZ requirements.
6.How does Aetrix verify that ADBMS1818ASWAZ is sourced from the original manufacturer or authorized distributors?
All ADBMS1818ASWAZ 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 ADBMS1818ASWAZ meets industry standards.
7.What is the process for return or replacement of ADBMS1818ASWAZ?
All ADBMS1818ASWAZ units undergo pre-shipment inspection (PSI). If there is an issue with ADBMS1818ASWAZ, 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 ADBMS1818ASWAZ part is unused and in its original packaging.
Return procedure for ADBMS1818ASWAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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