Data SheetTable of Contents1.0 Electrical Characteristics31.1 Absolute Maximum Ratings†31.2 Electrical Specifications32.0 Typical Performance Curves7FIGURE 2-1: INL vs. Supply Voltage (VDD).7FIGURE 2-2: INL vs. Temperature.7FIGURE 2-3: Offset Error vs. Temperature.7FIGURE 2-4: Output Noise vs. Input Voltage.7FIGURE 2-5: Total Error vs. Input Voltage.7FIGURE 2-6: Gain Error vs. Temperature.7FIGURE 2-7: IDDA vs. Temperature.8FIGURE 2-8: IDDS vs. Temperature.8FIGURE 2-9: IDDB vs. Temperature.8FIGURE 2-10: OSC Drift vs. Temperature.8FIGURE 2-11: Frequency Response.83.0 Pin Descriptions9TABLE 3-1: PIN Function Table93.1 Analog Inputs (VIN+, VIN-)93.2 Supply Voltage (VDD, VSS)93.3 Serial Clock Pin (SCL)93.4 Serial Data Pin (SDA)10FIGURE 3-1: Equivalent Analog Input Circuit.104.0 Description of Device Operation114.1 General Overview114.2 Power-On-Reset (POR)11FIGURE 4-1: POR Operation.114.3 Internal Voltage Reference114.4 Analog Input Channel114.5 Input Voltage Range124.6 Input Impedance124.7 Aliasing and Anti-aliasing Filter124.8 Self-Calibration124.9 Digital Output Codes and Conversion to Real Values13TABLE 4-1: Resolution Settings VS. LSB13TABLE 4-2: Example of output code for 18 bits (Note 1,Note 2)13TABLE 4-3: Minimum and Maximum Output codes (Note)13TABLE 4-4: Example of converting output code to voltage (With 18 Bit Setting)145.0 Using the MCP3421 Device155.1 Operating Modes155.2 Configuration Register16TABLE 5-1: Write Configuration Bits17TABLE 5-2: READ Configuration Bits175.3 I2C Serial Communications17FIGURE 5-1: MCP3421 Address Byte.18FIGURE 5-2: Timing Diagram For Writing To The MCP3421.18TABLE 5-3: Output Codes of each Resolution OPTION19FIGURE 5-3: iming Diagram For Reading From The MCP3421 With 18-Bit Mode.20FIGURE 5-4: Timing Diagram For Reading From The MCP3421 With 12-Bit to 16-Bit Modes.215.4 General Call22FIGURE 5-5: General Call Address Format.225.5 High-Speed (HS) Mode225.6 I2C Bus Characteristics22FIGURE 5-6: Data Transfer Sequence on I2C Serial Bus.23TABLE 5-4: I2c serial timing Specifications24FIGURE 5-7: I2C Bus Timing Data.266.0 Basic Application Configuration276.1 Connecting to the Application Circuits27FIGURE 6-1: Typical Connection Example.27FIGURE 6-2: Example of Multiple Device Connection on I2C Bus.27FIGURE 6-3: I2C Bus Communications Test.28FIGURE 6-4: Differential and Single- Ended Input Connections.286.2 Application Examples29FIGURE 6-5: Battery Voltage Measurement.29FIGURE 6-6: Battery Current Measurement.29FIGURE 6-7: Example of Pressure Measurement.30FIGURE 6-8: Simple Signal Conditioning Design with Asymmetric Circuit.30FIGURE 6-9: High Performance Signal Conditioning Design with Symmetric Circuit.30FIGURE 6-10: Example of Temperature Measurement.317.0 Development Tool Support337.1 MCP3421 Evaluation Boards33FIGURE 7-1: MCP3421 Evaluation Board.33FIGURE 7-2: Setup for the MCP3421 Evaluation Board with PICkit™ Serial Analyzer.33FIGURE 7-3: Example of PICkit™ Serial User Interface.348.0 Packaging Information358.1 Package Marking Information35Size: 723 KBPages: 42Language: EnglishOpen manual
User ManualTable of ContentsPreface5Introduction5Document Layout5Conventions Used in this Guide6Recommended Reading7The Microchip Web Site7Customer Support7Document Revision History8Chapter 1. Quick Start Instructions91.1 Introduction91.2 Description of the MCP3421 SOT23-6 Evaluation Board91.3 Getting Started with PICkit Serial Analyzer11Appendix A. Schematic and Layouts27A.1 Introduction27A.2 Board – Schematic28A.3 Board – Top Layer29A.4 Board – Top Metal Layer30A.5 Board – Bottom Metal Layer31Appendix B. Bill Of Materials (BOM)33Worldwide Sales and Service34Size: 585 KBPages: 34Language: EnglishOpen manual
