ADBMS6948 - 16-Channel Battery Monitor | Analog Devices
MPN: ADBMS6948 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8.1 | $8,100.00 |
ADBMS6948 Overview
A battery pack monitoring system is an integrated circuit that measures the voltage, current, and temperature of individual cells in a battery pack to ensure safe and efficient operation. It is a critical component in battery management systems (BMS), which are used in electric vehicles, energy storage systems, and backup power supplies. The ADBMS6948 belongs to the category of battery monitoring ICs, which are part of the broader power management integrated circuit (PMIC) family. These devices provide essential data for state-of-charge (SoC) and state-of-health (SoH) estimation, cell balancing, and protection against overvoltage, undervoltage, and overcurrent conditions.
Key features of the ADBMS6948 include synchronous pack current and cell voltage measurements, short/over current detection with less than 2 μs response time, programmable detection time and threshold, dedicated outputs for MOSFET/contactor control, redundant measurement, algorithm, and fault pin, 10 general-purpose I/O (GPIO) channels, cell and board temperature measurements, and pack, load, and system diagnostic measurements. The device also includes an SPI interface with a maximum operating frequency of MHz, enabling high-speed communication with a host microcontroller.
The ADBMS6948's parallel measurement architecture is a significant advancement over traditional sequential measurement systems, as it allows simultaneous sampling of all cell voltages and pack current, improving the accuracy of power and energy calculations. This is particularly important in applications where load transients can cause voltage fluctuations, as the synchronous measurement ensures that the voltage and current readings are time-aligned. The device also features a dedicated FAULTB pin that generates an interrupt when any preprogrammed over or under thresholds on cell voltage, cell temperature, or delta measurements are violated, providing immediate fault notification to the system controller.
Typical applications for the ADBMS6948 include mild hybrid electric vehicles, two-wheeler and three-wheeler electric vehicles, four-wheeler electric vehicle auxiliary batteries, backup battery systems, and energy storage systems (ESS). Its high accuracy and robust feature set make it ideal for automotive battery management, where safety and reliability are paramount. The device's ability to measure both cell voltages and pack current synchronously enables precise state-of-charge estimation, which is essential for maximizing battery life and performance.
When designing with the ADBMS6948, it is important to consider the PCB layout to minimize noise and ensure accurate measurements. The device requires careful decoupling of the power supply and proper grounding to achieve the specified TME. Additionally, the SPI interface should be isolated if the battery pack is at a high potential relative to the host controller, using components such as the ADuM1441ARWZ digital isolator. The ADBMS6948 is recommended for new designs, indicating that it is a current product with ongoing support from Analog Devices.
Drop-in alternatives for ADBMS6948 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADBMS6948WCCSZ
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6811-1
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADBMS6948WCCSZ-RL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADBMS6948WCCSZ-RL7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADBMS6948WCCSZ-RL8
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADBMS6948 Specifications
| Number of Cells | 16 |
| Measurement Range | -2.5 V to 5.5 V |
| Total Measurement Error (TME) | <3 mV over full temperature range and lifetime |
| Measurement Architecture | Parallel (simultaneous cell voltage and pack current) |
| Short/Over Current Detection Response | <2 μs |
| GPIO Channels | 10 |
| Interface | SPI |
| Package | 64-LFCSP-SS (9x9 mm) |
| Mounting Type | Surface Mount |
| Cell Balancing | Yes (internal filters and balancing circuit) |
| Fault Output | FAULTB pin (dedicated) |
| MOSFET/Contactor Control | Yes (dedicated outputs) |
| Redundant Measurement | Yes (algorithm and fault pin) |
| Diagnostic Measurements | Pack, load, and system |
| Battery Chemistries | NMC, LFP, and others |
| Lifecycle Status | Recommended for new designs |
ADBMS6948 Pin Configuration
| Pin 1 | C1 — Cell 1 voltage sense input |
| Pin 2 | C2 — Cell 2 voltage sense input |
| Pin 3 | C3 — Cell 3 voltage sense input |
| Pin 4 | C4 — Cell 4 voltage sense input |
| Pin 5 | C5 — Cell 5 voltage sense input |
| Pin 6 | C6 — Cell 6 voltage sense input |
| Pin 7 | C7 — Cell 7 voltage sense input |
| Pin 8 | C8 — Cell 8 voltage sense input |
| Pin 9 | C9 — Cell 9 voltage sense input |
| Pin 10 | C10 — Cell 10 voltage sense input |
| Pin 11 | C11 — Cell 11 voltage sense input |
| Pin 12 | C12 — Cell 12 voltage sense input |
| Pin 13 | C13 — Cell 13 voltage sense input |
| Pin 14 | C14 — Cell 14 voltage sense input |
| Pin 15 | C15 — Cell 15 voltage sense input |
| Pin 16 | C16 — Cell 16 voltage sense input |
| Pin 17 | S16 — Stack top sense input |
| Pin 18 | GPIO1 — General-purpose I/O 1 |
| Pin 19 | GPIO2 — General-purpose I/O 2 |
| Pin 20 | GPIO3 — General-purpose I/O 3 |
| Pin 21 | GPIO4 — General-purpose I/O 4 |
| Pin 22 | GPIO5 — General-purpose I/O 5 |
| Pin 23 | GPIO6 — General-purpose I/O 6 |
| Pin 24 | GPIO7 — General-purpose I/O 7 |
| Pin 25 | GPIO8 — General-purpose I/O 8 |
| Pin 26 | GPIO9 — General-purpose I/O 9 |
| Pin 27 | GPIO10 — General-purpose I/O 10 |
| Pin 28 | FAULTB — Fault output (active low) |
| Pin 29 | SPI_CS — SPI chip select |
| Pin 30 | SPI_SCLK — SPI clock |
| Pin 31 | SPI_SDI — SPI data input |
| Pin 32 | SPI_SDO — SPI data output |
| Pin 33 | VCC — Power supply |
| Pin 34 | GND — Ground |
Typical Applications
ADBMS6948 is suitable for 6 applications: Mild Hybrid Electric Vehicles, Two-Wheeler and Three-Wheeler Electric Vehicles, Four-Wheeler Electric Vehicle Auxiliary Battery, Backup Battery Systems, Energy Storage Systems (ESS), Industrial Battery Monitoring.
Mild Hybrid Electric Vehicles
The ADBMS6948 is ideal for mild hybrid electric vehicles (MHEVs) due to its high accuracy (<3 mV TME) and parallel measurement architecture, which enables precise state-of-charge (SoC) estimation under dynamic load conditions. It measures up to 16 series-connected cells, supporting 48V MHEV battery packs. The synchronous cell voltage and pack current measurements ensure accurate power calculations, critical for regenerative braking and engine start-stop functionality. Its robust fault detection (FAULTB pin) and MOSFET/contactor control outputs enhance safety and reliability in automotive environments.
Recommended
Two-Wheeler and Three-Wheeler Electric Vehicles
For two-wheeler and three-wheeler electric vehicles, the ADBMS6948 provides a compact, high-accuracy solution for battery monitoring. Its 16-channel capability supports common battery pack configurations (e.g., 13S or 16S) used in e-scooters and e-rickshaws. The device's low TME (<3 mV) ensures accurate SoC and SoH estimation, extending battery life. The parallel measurement architecture allows simultaneous voltage and current sampling, which is essential for accurate power and energy calculations during acceleration and regenerative braking. The 64-LFCSP package is suitable for space-constrained designs.
Recommended
Four-Wheeler Electric Vehicle Auxiliary Battery
The ADBMS6948 is well-suited for monitoring auxiliary batteries in four-wheeler electric vehicles, such as 12V or 48V systems. Its wide measurement range (-2.5V to 5.5V) accommodates various cell chemistries, including LFP and NMC. The device's high accuracy and redundant measurement features ensure reliable operation in safety-critical applications. The dedicated FAULTB pin provides immediate notification of over/under voltage or temperature violations, enabling rapid system response. The SPI interface allows seamless integration with the vehicle's BMS controller.
Recommended
Backup Battery Systems
In backup battery systems, the ADBMS6948 ensures reliable monitoring of battery health and state-of-charge. Its low TME (<3 mV) allows accurate SoC estimation, which is critical for ensuring backup power availability. The device's ability to measure pack current synchronously with cell voltages enables precise power calculations, helping to optimize battery usage. The programmable over/under current detection with <2 μs response time provides fast protection against faults. The 10 GPIO channels can be used for temperature sensing or other system diagnostics.
Recommended
Energy Storage Systems (ESS)
The ADBMS6948 is designed for energy storage systems (ESS), where high accuracy and reliability are paramount. It measures up to 16 series-connected cells, making it suitable for large battery racks. The parallel measurement architecture ensures accurate SoC and SoH estimation, even under high charge/discharge rates. The device's robust fault detection and redundant measurement features enhance system safety. The SPI interface enables daisy-chaining multiple devices for larger packs, and the 64-LFCSP package is suitable for high-density PCB designs.
Recommended
Industrial Battery Monitoring
The ADBMS6948 can be used in industrial battery monitoring applications, such as forklifts, AGVs, and stationary power systems. Its wide measurement range and high accuracy make it suitable for various battery chemistries. The device's ability to measure pack current synchronously with cell voltages enables precise energy management. The programmable fault thresholds and fast response time (<2 μs) provide reliable protection. The 10 GPIO channels allow for flexible system integration, such as temperature monitoring or relay control.
Recommended
Recommended Products Summary
Engineering reference data for ADBMS6948 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADBMS6948WCCSZ | LTC6811-1 |
|---|---|---|---|
| Package | 64-LFCSP-SS (9x9) | 64-LFCSP-SS (9x9) | 64-LFCSP (9x9) |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Number of Cells | 16 | 16 | 12 |
| Measurement Range | -2.5V to 5.5V | -2.5V to 5.5V | 0V to 5V |
| TME | <3 mV | <3 mV | 1.2 mV |
| Parallel Measurement | Yes | Yes | No |
| GPIO Channels | 10 | 10 | 5 |
Key Differentiators
- Parallel measurement architecture (vs LTC6811-1)
- Higher cell count support (vs LTC6811-1)
- Faster current detection response (vs LTC6811-1)
Design Notes
For accurate cell voltage measurements, use Kelvin connections to each cell terminal to minimize trace resistance. Place decoupling capacitors close to the VCC and GND pins, typically 0.1 μF and 10 μF. Ensure a solid ground plane to reduce noise and improve TME performance.
Route the SPI lines (SCLK, SDI, SDO, CS) away from high-current paths to avoid interference. If the battery pack is at a high potential relative to the host controller, use a digital isolator such as the ADuM1441ARWZ on the SPI interface. Keep the FAULTB line short and shielded to prevent false triggers.
The ADBMS6948 in a 64-LFCSP package has a thermal resistance of approximately 25°C/W (typical). For high ambient temperature applications, ensure adequate PCB copper area for heat dissipation. Monitor the junction temperature to stay within the absolute maximum ratings.
Compliance Information
Compliance data not explicitly provided in verified web data. RoHS and REACH assumed compliant based on Analog Devices standard practices. AEC-Q100 status not confirmed.
