GXSC Monitor Replaces LTC2990 in Image Processor Applications

As the core computing unit of vision systems, the Image Signal Processor (ISP) primarily handles high-density computational tasks. During operation, it exhibits characteristics such as significant dynamic load fluctuations, frequent instantaneous power surges, and stringent voltage accuracy requirements for multiple power supply rails. To ensure stable imaging quality, reliable real-time computation, and long-term continuous equipment operation, the system requires a monitor IC that can collect supply voltage, load current, and chip temperature data to provide system-level support.

The ISP core, I/O interfaces, DDR cache, and analog circuits are powered by independent multi-rail supplies. Voltage accuracy directly impacts imaging quality and operational stability. The GXSC four-channel I²C voltage, current, and temperature monitor integrates a 14-bit high-precision ADC, a low-drift voltage reference, four-voltage and two-current multi-point simultaneous monitoring, and both internal and external dual-domain temperature sensing. This enables comprehensive, fine-grained monitoring of multi-rail power supplies, dynamic loads, chip temperature, and real-time power consumption across all dimensions.

The GXSC monitor achieves a single-ended voltage resolution as low as 305.18μV, a differential voltage resolution as low as 19.075μV, and a temperature resolution as low as 0.0625°C. Over the -40°C to +125°C range, it delivers voltage measurement accuracy better than 0.25%, current measurement accuracy better than 0.75%, and temperature measurement accuracy better than 1.8°C. It is well-suited for single or mixed-system applications requiring voltage, current, and temperature monitoring in power supply systems and beyond.

Key Features of the GXSC Monitor:

Measures 4 channels of single-ended voltage, or 2 channels of differential voltage (current), or 2 channels of remote temperature

Supports measurement of voltage, current, and temperature individually or in any combination

Monitors its own internal operating voltage and temperature

Single-ended voltage measurement accuracy better than 0.75% with 305.18μV resolution

Differential voltage and current measurement accuracy better than 0.75% with 19.075μV resolution

Remote temperature measurement accuracy better than 1.8°C with 0.0625°C resolution

Internal temperature measurement accuracy better than 1.5°C with 0.0625°C resolution

14-bit ADC for voltage/current measurement

Operating supply voltage range: 2.9V to 5.5V

I²C interface with 4 selectable addresses, allowing up to 4 devices to share the same bus

Internal 10ppm/°C voltage reference

ESD rating of 6kV HBM on V1–V4 analog input pins