Isolated Network High-Speed Transceiver
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18-Channel Li-Ion Battery Cell Controller IC
- This page contains information on a preproduction product. Specifications and information herein are subject to change without notice. For additional information contact support or your sales representative.
The BMA7318 is a Li-ion battery cell controller IC designed specifically for automotive HVBMS, industrial ESS, and 48 V applications. It can monitor up to 18 battery cells and 12 temperatures. The BMA7318 features configurable averaging of cell voltage measurements through digital filtering, onboard balancing up to 300 mA, and integrated current measurement, this device supports ISO 26262, up to ASIL C safety capability and high integrity safety levels up to industrial SIL-2.
The BMA7318 also includes an integrated communication bridge (SPI2TPL) with robust isolated 2.0 Mbit/s communication. The BMA7318 is designed to provide up to 25 years of ESS application lifetime with an extended mission profile (EMP) and shares a product family approach with PIN2PIN compatibility between the BMA7318 and BMI7318 devices.
Product Details
Features
- From 4 to 18 cells per device
- ISO 26262 ASIL C for cell voltage and temperature measurement
- Integrated high accuracy current measurement
- SIL 2 safety for industrial application
- Up to 12 AIN measurement channels
- Up to 300 mA cell balance current
- TPL or SPI communication
- SPI2TPL bridge function
- Diagnostics, functional safety and robustness
- Low external BOM cost
- Flexible and versatile busbar bypass connection in any location
- Typical ±0.8 mV measurement error with ultra low long-term drift
Comparison Table
| Parameter | BMA7318FAIAE | BMA7318TAIAE | BMA7318TANAE | BMA7518SAIAE | BMI7318TANAE |
|---|---|---|---|---|---|
| Voltage Channel | 4..18 | 4..18 | 4..18 | 4..18 | 4..18 |
| Supply Range (Max) | 9 V..90 V (94 V) | 9 V..90 V (94 V) | 9 V..90 V (94 V) | 9 V..90 V (94 V) | 9 V..90 V (94 V) |
| Cell Voltage Range | -0.3 V to 5 V | -0.3 V to 5 V | -0.3 V to 5 V | -0.3 V to 5 V | -0.3 V to 5 V |
| Cell Measurement Error | ±1 mV | ±1 mV | ±1 mV | ±1 mV | ±1 mV |
| Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | |
| Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | |
| Cell Measurement Error After Lifetime | ±1.5 mV | ±1.5 mV | ±1.5 mV | ±1.5 mV | ±1.5 mV |
| Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | Vcell=3.1 V..3.35 V | |
| Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | Tj=-40 °C..65 °C | |
| Communication Port | SPI with SPI2TPL bridge | TPL | TPL | SPI | TPL |
| CB MOSFET Rdson | 1.5 ohm | 1.5 ohm | 1.5 ohm | 1.5 ohm | 1.5 ohm |
| CB Current Max | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA |
| AIN Channels | 10 | 10 | 12 | 10 | 12 |
| GPIO Channel | 10 | 10 | 10 | 10 | 10 |
| I²C Controller | full I²C leader | full I²C leader | full I²C leader | full I²C leader | full I²C leader |
| Current Channel | Yes | Yes | No | Yes | No |
| Coulomb Counter | Yes | Yes | No | Yes | No |
| Package | 64-pin LQFP-EP | 64-pin LQFP-EP | 64-pin LQFP-EP | 64-pin LQFP-EP | 64-pin LQFP-EP |
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