MCP3910-E/SS

Overview

The MCP3910-E/SS is a 3V two-channel Analog Front End (AFE) designed for energy metering applications. It integrates two synchronous sampling 24-bit Delta-Sigma ADCs, two Programmable Gain Amplifiers (PGA), and a low-drift internal voltage reference. The device features a high-speed 20 MHz SPI-compatible serial interface and supports resolutions from 16 to 24 bits with an Oversampling Ratio (OSR) ranging from 32 to 4096. PGA gain is configurable from 1x to 32x. It operates within a supply voltage range of 2.7 V to 3.6 V and functions across a temperature range of -40°C to +125°C. The component is housed in a 20-pin SSOP package.

Feature Summary

• Integrates two synchronous sampling Delta-Sigma ADCs with programmable gain amplifiers for precise signal conditioning.
• Includes advanced security features such as CRC-16 checksums and register map locking via password protection.
• Supports polyphase shunt-based energy meters using a two-wire serial interface to reduce system isolation costs.
• Features digital offset and gain error calibration registers alongside auto-zeroing and dithering capabilities.

Applications

• Polyphase shunt-based energy meters
• Smart grid metering systems
• Industrial power monitoring equipment

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm package type and tape/reel specifications. Ensure the ordering code matches the required automotive qualification status if applicable. Confirm moisture sensitivity levels and recommended reflow profiles prior to assembly. Cross-reference the part number alias to avoid procurement errors due to naming variations.

Selection Notes

Select this component when designing multi-phase energy meters requiring synchronized voltage and current sampling. The integrated PGA and calibration features simplify sensor interfacing for shunts, CTs, or Hall effect sensors. Consider the two-wire interface option if minimizing isolator count per phase is critical for cost reduction. Verify that the MCU supports the required SPI data formats and DMA access for efficient data handling.

Part Context

The MCP3910 belongs to Microchip's MCP3910 series of analog front ends specifically engineered for utility-grade energy metering. It serves as a complete solution for acquiring and digitizing analog signals from various sensors. The device replaces discrete amplifier and ADC combinations, reducing board space and design complexity while maintaining high accuracy through internal calibration mechanisms.

Replacement Considerations

MCP3910A1T-E/SS

FAQ

What types of sensors can the MCP3910 interface with?

The MCP3910 can interface with shunts, current transformers, Rogowski coils, and Hall effect sensors.

How does the MCP3910 secure its configuration settings?

It uses a CRC-16 checksum on serial data outputs and static register maps, along with a register map lock protected by an 8-bit password to prevent unauthorized write commands.