GXSC ADC Replaces LTC2990 in Motor Protection Applications

Industrial motors serve as the power-driven actuators in smart manufacturing and automated production lines. Since motors are required to operate continuously for long periods and undergo frequent starts and stops, they are prone to faults such as overloads, overcurrent, undervoltage, overvoltage, and three-phase parameter imbalances, which can lead to reduced motor efficiency. Therefore, high-precision, multi-dimensional motor monitoring and protection mechanisms can ensure long-term, stable motor operation and reduce equipment failure rates.

Motor protection systems require a monitoring chip capable of synchronous, multi-parameter monitoring. The GXSC ADC features a built-in 14-bit high-precision ADC, four-channel differential inputs, integrated temperature sensing, and a convenient I2C interface. It enables synchronous and precise monitoring of motor current, temperature, and supply voltage, simultaneously acquiring the three core parameters—motor operating voltage, operating current, and winding temperature—to ensure temporal alignment of these parameters. This accurately matches the characteristics of fault conditions and prevents misjudgments based on a single parameter.

The four monitors of the GXSC ADC can measure four external single-ended voltages independently, or be paired to measure two differential voltages, currents, or the temperature of a remote BJT; they can also measure internal temperature and the power supply voltage VCC. The device minimizes the number of required support components and board space through its built-in 10 ppm/°C reference. Optional I²C address and function configuration allow the device to be flexibly applied in various systems requiring temperature, voltage, or current data measurement.

Key advantages of the GXSC ADC for motor protection:

1. Compact size, low power consumption, and built-in 14-bit ADC

2. High sensitivity: temperature resolution of 0.06°C, single-ended voltage resolution of 305 μV, and differential voltage resolution of 19 μV

3. Built-in series resistance compensation for remote current and temperature measurement modes

4. Configurable I²C addresses; the chip supports up to four devices sharing a single bus

5. Independent configuration of operating modes for each monitoring channel; a single chip can simultaneously measure voltage, current, and temperature