توضیحات
MCP3912 يک آنالوگ آنالوگ 3 ولتي (AFE) است که شامل چهار مبدل آنالوگ به ديجيتال دلتا سيگما (ADC)، چهار PGA، بلوک جبران تاخير فاز، مرجع ولتاژ داخلي کم رانش، Offset ديجيتال و کاليبراسيون خطاي Gain است. رجيسترها و رابط سريال پرسرعت 20 مگاهرتز سازگار با SPI. ADC هاي MCP3912 کاملاً قابل تنظيم هستند و داراي ويژگي هايي مانند وضوح 16/24 بيتي، نسبت نمونه برداري بيش از حد (OSR) از 32 تا 4096، افزايش از 1x به 32x، خاموش شدن و بازنشاني مستقل، ديترينگ و صفر کردن خودکار هستند. ارتباط تا حد زيادي با دستورات 8 بيتي، از جمله حالت‌هاي مختلف خواندن/نوشتن مداوم و فرمت‌هاي داده 16/24/32 بيتي که توسط دسترسي مستقيم به حافظه (DMA) يک MCU 8، 16 يا 32 بيتي قابل دسترسي است، ساده‌تر مي‌شود. .
Description
The MCP3912 is a 3V four-channel Analog Front End (AFE) containing four synchronous sampling DeltaSigma Analog-to-Digital Converters (ADC), four PGAs, phase delay compensation block, low-drift internal voltage reference, Digital Offset and Gain Error Calibration registers, and high-speed 20 MHz SPI-compatible serial interface. The MCP3912 ADCs are fully configurable, with features, such as 16/24-bit resolution, Oversampling Ratio (OSR) from 32 to 4096, gain from 1x to 32x, independent shutdown and Reset, dithering and autozeroing. The communication is largely simplified with 8-bit commands, including various continuous Read/ Write modes and 16/24/32-bit data formats that can be accessed by the Direct Memory Access (DMA) of an 8, 16 or 32-bit MCU. A separate Data Ready pin is also included that can directly be connected to an Interrupt Request (IRQ) input of an MCU. The MCP3912 includes advanced security features to secure the communications and the configuration settings, such as a CRC-16 checksum on both serial data outputs and static register map configuration. It also includes a register map lock through an 8-bit secure key to stop unwanted WRITE commands from processing. The MCP3912 is capable of interfacing with a variety of voltage and current sensors, including shunts, current transformers, Rogowski coils and Hall effect sensors.
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