Replacing the ADS1115 with the GXSC ADC for Battery Voltage and Current Monitoring

The battery voltage and current monitoring system is a key component of the battery management system (BMS), primarily responsible for monitoring the battery’s real-time voltage, charge and discharge currents, remaining capacity, and operating status. The system converts battery charge and discharge current signals using precision sampling resistors, adjusts the battery voltage amplitude via a resistive voltage divider network, and sends the analog electrical signals to the ADC module for analog-to-digital conversion. It then reads the digitized voltage and current data and uses metering algorithms and voltage calibration models to calculate the battery’s remaining SOC, charge/discharge power, and operating temperature in real time.

High-precision battery monitoring technology requires an analog-to-digital converter (ADC) chip with high sampling resolution. GXSC’s 16-bit, four-channel Δ-Σ ADC is suitable for the precise acquisition of weak battery voltage and current signals. The chip is pin-to-pin compatible with the ADS1115, meeting design requirements for rapid integration into miniature battery monitoring terminals and lightweight BMS modules.

The GXSC ADC features high precision and low power consumption, with an integrated low-drift voltage reference, an oscillator, a programmable gain amplifier (PGA), and a digital comparator. When acquiring battery data, it can perform conversions at a rate of 2 kSPS. The PGA provides a programmable input voltage range of ±256 mV to ±6.144 V, and the input multiplexer (MUX) supports 4 single-ended inputs and 2 differential inputs. The digital comparator provides overvoltage detection functionality.

The GXSC ADC can operate in single-conversion or continuous-conversion mode. In single-conversion mode, the device automatically enters power-down mode after a conversion is complete, thereby significantly reducing current consumption in idle state.

GXSC ADC Features:

Wide supply voltage range: 2.5 V to 5 V

Low current consumption: 260 μA (continuous conversion mode)

Programmable data rate: 6.25 SPS to 2 kSPS

Internal low-drift voltage reference, internal oscillator, and internal programmable gain amplifier

I²C interface

Temperature range: -40°C to 125°C

4 single-ended or 2 differential inputs

Compliant with AEC-Q100 specifications