16 bit 8-channel AFE GX1148 software and hardware replacement for ADS1148 applied in industrial and commercial energy storage battery management system

The industrial and commercial energy storage battery management system is mainly used to monitor key parameters such as voltage, current, and temperature of the battery pack in real time, accurately estimate the battery state (SOC, SOH), achieve battery balance control and safety protection, and ensure the safe and efficient operation of the energy storage system.

Industrial and commercial energy storage systems are typically composed of hundreds or even thousands of lithium batteries connected in series. Voltage differences between individual batteries can lead to capacity imbalance, and long-term operation can shorten battery life. Therefore, multi-channel synchronous sampling, low-noise, and high anti-interference AFEs are needed to meet the high-precision monitoring requirements of individual batteries. This solution recommends using a low-cost, low-power, and highly integrated analog front-end chip GX1148, which includes an 8-channel analog switch, low-noise PGA, low-temperature drift reference source, high matching IDAC, and high-precision 16 bit delta ADC.

Industrial and commercial energy storage systems generally suffer from strong electromagnetic interference, and the analog signals of BMS are easily affected by common mode voltage interference. GX1148 has a high common mode rejection ratio and a wide common mode voltage range. At the same time, the chip can operate continuously in a wide temperature environment from -40 ℃ to 85 ℃, fully meeting the reliability standards of industrial grade.

The application characteristics of GX1148 chip are as follows:

1. Number of channels: 8 single ended/4 pairs of differential

2. Output rate: 2kSPS

3. Continuous conversion power: 2mW

4. High integration:

Integrated internal benchmark: Temperature drift 20ppm/℃ (Maximum)

› Programmable differential amplifier (integrated high impedance PGA)

› Integrated 2-channel high matching IDAC

Integrated Bias voltage and wire breakage detection

Integrated internal temperature sensor

5. Support 50/60Hz simultaneous suppression

6. Single cycle establishment and automatic channel scanning

7. Support SPI CRC verification

8. Digital power supply: 2.7V~5.25V

9. Analog power supply: unipolar (2.7V~5.25V)&bipolar (± 2.5V)

10. Package: TSSOP (28 pin), operating temperature range: -40 ° C to+125 ° C