SGM832: 36V, 16-Bit Current, Voltage, and Power Monitoring Chip

SG Micro Corp has launched the SGM832 monitoring chip, which can be used for monitoring voltage, current, and power in power supply systems. The chip is compatible with I²C and SMBus interfaces and can simultaneously monitor differential voltage and bus power voltage. It features flexible register configuration, allowing users to edit operating modes, conversion times, counts, and set alarm functions and thresholds, ultimately outputting current (A), voltage (V), and power (W) signals. The chip is packaged in environmentally friendly MSOP-10 and TDFN-3×3-10L green packages, with an operating temperature range of -40℃ to +125℃.

Figure 1 SGM832 Typical Application Circuit

• Supports 2.7V to 5.5V independent power supply;

• Single-ended bus monitoring voltage from 0V to 36V, fixed 1.25mV LSB;

• Bidirectional differential sampling voltage from -81.92mV to +81.9175mV, fixed 2.5μV LSB;

• 8 adjustable conversion times, with separate control for bus voltage and differential voltage;

• 8 adjustable conversion counts;

• 16 editable address bits;

• Continuous, triggered, and power-saving modes adjustable, supporting separate monitoring of bus voltage and differential voltage;

• Over/under-voltage and over-power warning functions for bus voltage and differential voltage.

1. The SGM832 includes an integrated 05h calibration register, calculated based on the resistance of the sampling resistor and the maximum current to be monitored. The chip calculates the actual current value from the differential voltage using the value of the 05h register and ultimately derives the power value. In continuous mode, the bus voltage and differential voltage are monitored separately through internal interleaving, and the internal logic calculation does not consume conversion time.

Figure 2 SGM832 Functional Block Diagram

2. The SGM832 features a high-precision V_REF voltage and integrates a temperature compensation circuit, effectively improving temperature drift characteristics.

3. The SGM832 employs a multi-point trim scheme to reduce gain error and effectively improve testing accuracy.

With the large-scale coverage of 5G networks and the new trends in AI development, the demand for servers, large switches, and other communication and storage devices has surged, leading to an explosive growth in energy consumption and operational costs of supporting equipment. Establishing a power supply system monitoring platform to create energy consumption models, perform energy statistics, and ultimately optimize energy use through analysis reports has become a mainstream solution.

Taking the server platform as an example, the system needs to monitor the power consumption of modules such as boards, fans, hard disks, network cards, and CPUs in real-time, reporting the operational status to the processor based on set alarm thresholds. A 2mΩ sampling resistor is connected in series with the 12V voltage rail of a single module, with VBUS collecting VIN-, which is the module’s operating voltage. The maximum working current value is 10A, and the calibration register value is calculated and input into the chip’s 05h register, allowing real-time monitoring of output voltage, current, and power values once the operating mode is configured.

Figure 7 High-Side Sampling Circuit

By setting the differential voltage over-voltage warning function in the 06h register and configuring the threshold size in the 07h register, and adjusting different conversion times, the following warning response graph is obtained. The faster the set conversion time, the quicker the response, but the accuracy decreases accordingly.

SG Micro Corp (Beijing) Co., Ltd. (Stock Code 300661) focuses on the research and development and sales of high-performance, high-quality analog integrated circuits. Its products cover two major fields: signal chain and power management, with over 4,600 models available for sale across 30 categories, all developed in-house, widely used in industrial, automotive electronics, communication equipment, consumer electronics, and medical instruments, as well as emerging markets such as the Internet of Things, renewable energy, and artificial intelligence.

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