Isolated Network High-Speed Transceiver
18-Channel Li-Ion Battery Cell Controller IC
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The BMA7318 is a Li-ion battery cell controller IC designed specifically for automotive HVBMS, industrial ESS and 48 V.
- Monitoring of up to 18 Battery Cells and 12 temperatures
- Configurable averaging of cell voltage measurements (Digital Filtering)
- Onboard balancing up to 300 mA
- Integrated current measurement
- Integrated communication bridge (SPI2TPL) and robust isolated 2.0 Mbps communication
- Up to 25 yrs ESS application lifetime with extended mission profile (EMP)
- Product family approach PIN2PIN compatibility 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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