GXSC Voltage, Current, and Temperature Monitor LTC2990 Applied to Motor Current Measurement

Electric motors are the power core in fields such as industrial automation, automotive electronics, and home appliances. The current signal of electric motors can reflect the parameters of motor operating conditions, which not only forms the basis for advanced algorithms such as vector control and torque regulation, but also serves as a key basis for overcurrent protection and fault warning. The operating environment of motors is often accompanied by high-frequency PWM interference, wide temperature fluctuations, and high-power noise. The dynamic range of current signals is wide and susceptible to interference, while monitoring related parameters such as temperature and voltage is necessary to achieve comprehensive evaluation.

The measurement of motor current requires real-time capture of winding phase current, bus current and other signals, which are converted into processable electrical signals to provide support for control algorithms and protection mechanisms. The detection device of this scheme can use GXSC‘s multi parameter monitoring chip, with built-in 14 bit high-precision ADC, four channel differential input, integrated temperature detection, and I2C convenient interface. It can achieve synchronous and accurate monitoring of motor current, temperature, and power supply voltage, adapt to the needs of motor control scenarios, and become the preferred solution for simplifying monitoring links and improving system reliability.

The GXSC monitor chip‘s four monitors can independently measure four external single ended voltages, or pair to measure two differential voltages, currents, or remote BJT temperatures. It can also measure internal temperature and power supply voltage VCC. The device minimizes the required number of supporting components and board area through its built-in 10ppm/C benchmark. The optional I2C address and functional configuration enable the device to be flexibly applied to various systems that require measurement of temperature, voltage, or current data.

Performance indicators of the GXSC monitor chip:

Adopting a 10 pin MSOP package with small size, low power consumption, and built-in 14 bit ADC

Working temperature -55 ° C~125 ° C, supports FPGA, MCU or DSP controllers through I2C interface

High sensitivity, temperature resolution up to 0.06 ° C, single ended voltage resolution up to 305pV, differential voltage resolution up to 19uV

Built in remote current and temperature measurement mode with series resistance cancellation function

L2C address can be configured, and the device supports up to 4 shared buses

The working modes of each monitor can be independently configured, and a single monitor can measure voltage, current, and temperature simultaneously

From this, it can be seen that the GXSC monitor chip is highly suitable for systems that require resolution below millivolts, 1% current measurement, and 3.5 ° C temperature accuracy, or any combination of these three.