NXP Semiconductors BMI7018 18-Ch Li-Ion Battery Cell Controller ICs
NXP Semiconductors BMI7018 18-Channel Li-Ion Battery Cell Controller ICs are lithium-ion battery-cell controller ICs for use in industrial applications, such as energy storage systems (ESS) and uninterruptible power supply (UPS) systems. The BMI7018 ICs offer a Transport Protocol Link (TPL3 - proprietary isolated daisy chain protocol of NXP) and Serial Peripheral Interface (SPI) for communication with the host microcontroller unit (MCU). These devices support high-precision cell voltage and temperature measurements along with various cell voltage balancing strategies. Aside from an SPI interface to enable direct communication with the host MCU, the ICs provide alternatively a daisy chain communication interface that supports capacitive and inductive isolation between nodes.
Features
- -20°C to +60°C ambient temperature range
- Support for cell voltage and cell temperature measurements from the host MCU to the cell
- Cell voltage measurement
- 4x to 18x cells per device
- 9V to 90V operating voltage range
- Supports bus bars voltage measurement with -3V to +5V input voltage
- 16-bit resolution and up to ±0.8mV typical measurement accuracy with ultra-low long-term drift
- Integrated configurable digital filter
- External temperature and auxiliary voltage measurements
- One analog input for absolute measurement, 5V input
- Eight analog inputs configurable as absolute or ratiometric, 5V input
- 16-bit resolution and ±5mV typical measurement accuracy
- Integrated configurable digital filter
- Internal measurement
- Two redundant internal temperature sensors
- Supply voltages
- External transistor current
- I2C-bus leader interface to control external devices (example: EEPROMs and security ICs)
- Configurable alarm output
- Cyclic wake-up to monitor the pack and the balancing function during sleep
- Capability to wake up the host MCU via a daisy chain in case of a fault event
- Host interface supporting SPI or isolated daisy chain communication (TPL3)
- 2Mbit/s data rate for TPL interface (MBMI7018TA1AE)
- 4Mbit/s data rate for SPI interface (MBMI7018SA1AE)
- Plastic, thermal enhanced low profile quad flat package (LQFP64)with 64x terminals, 0.50mm pitch, 10mm x 10mm x 1.4mm body
- TPL3 daisy chain communication supports
- Two-wire daisy chain with capacitive or inductive isolation
- Protocol supporting up to six daisy chains and 62x nodes per chain
- Cell voltage balancing
- 18x internal balancing field effect transistors (FETs), up to 360mA peak with 0.5Ω RDSon per channel (typical)
- Support for simultaneous passive balancing of all channels with automatic odd/even sequence
- Global balancing timeout timer
- Timer controlled balancing with individual timers with 10s resolution and up to 45h duration
- Voltage-controlled balancing with global and individual undervoltage thresholds
- Temperature-controlled balancing; if balancing resistors or the IC are in overtemperature, balancing is interrupted
- Configurable pulse width modulation (PWM) duty cycle balancing
- Automatic pause of balancing during measurement with configurable filter settling time
- Configurable delay of the start of balancing after transition to sleep
- Automatic discharge of the battery pack (emergency discharge)
- Constant current cell balancing to compensate for the balancing current variation due to cell voltage variation
- Unique device ID with dynamic addressing
- Operation modes
- Active mode FP, 12mA typical
- Sleep mode LP, 60µA typical
- Deep Sleep mode ULP, 15µA typical
Applications
- Energy Storage Systems (ESS)
- Uninterruptible Power Supplies (UPS)
- Front-of-the-meter
- Residential
- Portable equipment
Resources
Key Functions
Development Tool
NXP Semiconductors RDI7018C3T1 Reference Design
A battery cell monitoring unit reference design with an ETPL communication interface toward a BMU.
Đã phát hành: 2025-01-10
| Đã cập nhật: 2025-10-14