MCP3918 3V Single-Channel Analog Front End Features: Description: The MCP3918 is a 3V single-channel Analog Front End One 24-Bit Resolution Delta-Sigma A/D Converter (AFE), containing one Delta-Sigma Analog-to-Digital 93.5 dB SINAD, -107 dBc Total Harmonic th Converter (ADC), one Programmable Gain Amplifier Distortion (THD) (up to 35 harmonic), (PGA), phase delay compensation block, low-drift 112 dB Spurious-Free Dynamic Range (SFDR) internal voltage reference, digital offset and Gain Error Flexible Serial Interface that Includes Both SPI Calibration registers, and high-speed 20 MHz SPI and a Simple Two-Wire Interface Ideal for compatible serial interface. Polyphase Shunt Energy Meters The MCP3918 ADC is fully configurable with features Advanced Security Features: such as: 16-/24-bit resolution, Oversampling Ratio - 16-Bit Cyclic Redundancy Check (CRC) (OSR) from 32 to 4096, gain from 1x to 32x, independent Checksum on All Communications for Secure shutdown and Reset, dithering and auto-zeroing. Data Transfers Communication is largely simplified with 8-bit com- - 16-Bit CRC Checksum and Interrupt Alert for mands, including various continuous Read/Write modes Register Map Configuration and 16-/24-/32-bit data formats that can be accessed by - Register Map Lock with 8-Bit Secure Key the Direct Memory Access (DMA) of an 8, 16 or 32-bit , DV MCU, and with the separate Data Ready pin that can 2.7V-3.6V AV DD DD directly be connected to an Interrupt Request (IRQ) input Programmable Data Rate, Up to 125 ksps: of an MCU. - 4 MHz Maximum Sampling Frequency The MCP3918 includes advanced security features to - 16 MHz Maximum Master Clock secure the communications and the configuration set- Oversampling Ratio, Up to 4096 tings, such as a CRC-16 checksum on both serial data Ultra Low-Power Shutdown Mode with < 10 A outputs and on the register map static configuration. It Low-Drift 1.2V Internal Voltage Reference: also includes a register map lock through an 8-bit 9 ppm/C password to avoid the processing of any unwanted Differential Voltage Reference Input Pins WRITE commands. High-Gain Programmable Gain Amplifier (PGA) For polyphase shunt-based energy meters, the (up to 32 V/V) MCP3918 two-wire serial interface greatly reduces Phase Delay Compensation with 1 s Time system cost, requiring only a single bidirectional Resolution isolator per phase. Separate Data Ready Pin for Easy The MCP3918 is capable of interfacing a variety of volt- Synchronization age and current sensors, including shunts, Current Individual 24-Bit Digital Offset and Gain Error Transformers (CTs), Rogowski coils and Hall effect Correction sensors. High-Speed 20 MHz SPI Interface with Mode 0,0 and 1,1 Compatibility Applications: Continuous Read/Write Modes for Minimum Single-Phase and Polyphase Energy Meters Communication with Dedicated 16-/32-Bit Modes Energy Metering and Power Measurement Available in 20-Lead QFN and SSOP Packages Automotive Extended Temperature Range: -40C to +125C Portable Instrumentation (all specifications are valid down to -45C) Medical and Power Monitoring Audio/Voice Recognition Isolator Sensor Application 2014-2020 Microchip Technology Inc. DS20005287C-page 1MCP3918 Package Type MCP3918 MCP3918 SSOP 4x4 QFN* RESET/OSR0 1 20 SDI/OSR1 DV 19 SDO DD 2 AV 3 18 SCK/MCLK DD CH0+ 4 17 CS/BOOST CH0- 5 16 OSC2/MODE 20 19 18 17 16 NC 6 15 OSC1/CLKI/GAIN0 CH0+ 1 15 SCK/MCLK NC 7 14 DR/GAIN1 CH0- 2 14 CS/BOOST AGND 8 13 MDAT0 EP 3 13 OSC2/MODE NC 21 REFIN+/OUT 12 9 NC 12 OSC1/CLKI/GAIN0 REFIN- 10 11 DGND NC 4 11 DR/GAIN1 AGND 5 67 8 9 10 * Includes Exposed Thermal Pad (EP) see Table 3-1. Functional Block Diagram AV DV DD DD REFIN+/OUT Voltage VREFEXT AMCLK Xtal Oscillator Reference OSC1/CLKI/GAIN0 MCLK Clock + V Generation REF OSC2/MODE DMCLK/DRCLK - REFIN- ANALOG DIGITAL Vref- Vref+ OSR<2:0> DMCLK PRE<1:0> 3 SINC + OFFCAL CH0 GAINCAL CH0 1 SINC <23:0> <23:0> CH0+ + MOD<3:0> DATA CH0 + X <23:0> CH0- - DR/GAIN1 PGA SDO Modulator PHASE <11:0> Phase Digital Shifter Single-Channel ADC Interfaces RESET/OSR0 (SPI & 2-wire) SDI/OSR1 SCK CS/BOOST EN MDAT MOD <3:0> MDAT0 Modulator POR POR Output Block AVDD DVDD Monitoring Monitoring A D GND GND DS20005287C-page 2 2014-2020 Microchip Technology Inc. REFIN+/OUT AV DD DV REFIN- DD DGND RESET/OSR0 SDI/OSR1 NC SDO MDAT0