LPC845
NXP Semiconductors
A smart charging solution implemented with LPC845 is recommended.
Application NoteNxp
Smart Battery Charger by LPC845 with SMBus Interface
A guide for building a smart battery charger using the NXP LPC845 MCU, featuring SMBus communication, PWM-based charging control, and real-time status monitoring on an LCD.
Overview
This application note details a smart battery charging solution using the NXP LPC845 microcontroller. The system is designed to charge 8.4V Li-ion battery packs through four stages: pre-charging, constant current, constant voltage, and full charge. It employs the SMBus v1.1 protocol to interface with a bq40z50 battery manager for real-time monitoring of voltage, current, and temperature. Hardware components include a buck converter circuit regulated by 70 kHz PWM, a 2.8-inch SPI-driven TFT LCD for data visualization, and an integrated ADC for temperature sampling via a PTC thermistor. The document covers hardware connections, software flowcharts, and the use of FreeMASTER for real-time debugging.
Use Cases
- Smart battery charging for portable electronics
- SMBus v1.1 communication implementation
- MCU-based buck converter voltage regulation
- Real-time battery status monitoring and LCD integration
Topics
LPC845
SMBus
Li-ion battery charger
bq40z50
PWM
NXP Semiconductors
Cortex-M0+
Power Management
LPC4370
Referenced Parts
bq40z50
Texas Instruments
The battery package contains a Li-Ion battery pack manager chip named bq40z50.
LPC4370
NXP Semiconductors
It can also be used as an evaluation board in its own right for the NXP LPC4370 triple core MCU.
LPC4370
NXP
be used as an evaluation board in its own right for the NXP LPC4370 triple core MCU.
LPC845
NXP
Figure 2 shows the system diagram, including NXP LPC845 battery charger board, +12 Adapter, smart batter, LCD, and emulator.
| LPC845 | NXP Semiconductors | A smart charging solution implemented with LPC845 is recommended. |
| bq40z50 | Texas Instruments | The battery package contains a Li-Ion battery pack manager chip named bq40z50. |
| LPC4370 | NXP Semiconductors | It can also be used as an evaluation board in its own right for the NXP LPC4370 triple core MCU. |
| LPC4370 | NXP | be used as an evaluation board in its own right for the NXP LPC4370 triple core MCU. |
| LPC845 | NXP | Figure 2 shows the system diagram, including NXP LPC845 battery charger board, +12 Adapter, smart batter, LCD, and emulator. |