MCP9804 0.25C Typical Accuracy Digital Temperature Sensor Features Description Accuracy: Microchip Technology Inc.s MCP9804 digital temperature sensor converts temperatures between - 0.25C (typical) from -40C to +125C -40C and +125C to a digital word with 0.25C/1C - 1C (maximum) from -40C to +125C (typical/maximum) accuracy. - +0.05C (typical) lifetime drift The MCP9804 comes with user-programmable registers - 0.0625C or 1 LSb (typical) repeatability that provide flexibility to temperature sensing User-Selectable Measurement Resolution: applications. The registers allow user-selectable - +0.5C, +0.25C, +0.125C, +0.0625C settings such as Shutdown or Low-Power modes and User-Programmable Temperature Limits: the specification of temperature Alert window limits and critical output limits. When the temperature changes - Temperature Window Limit beyond the specified boundary limits, the MCP9804 - Critical Temperature Limit outputs an Alert signal. The user has the option of setting User-Programmable Temperature Alert Output the Alert output signal polarity as an active-low or active- Operating Voltage Range: 2.7V to 5.5V high comparator output for thermostat operation, or as a Operating Current: 200 A (typical) temperature Alert interrupt output for microprocessor- Shutdown Current: 0.1 A (typical) based systems. The Alert output can also be configured 2 as a critical temperature output only. 2-wire Interface: I C/SMBus Compatible Available Packages: 2x3 DFN-8, MSOP-8 This sensor has an industry standard 100 kHz, 2-wire, 2 SMBus/I C compatible serial interface, allowing up to eight or sixteen sensors to be controlled with a single Typical Applications serial bus (see Table 3-2 for available Address codes). General Purpose These features make the MCP9804 ideal for Industrial Applications sophisticated, multi-zone, temperature-monitoring applications. Industrial Freezers and Refrigerators Food Processing Package Types Personal Computers and Servers PC Peripherals 8-Pin 2x3 DFN * 8-Pin MSOP Consumer Electronics V SDA 1 8 SDA 1 8 V DD DD Handheld/Portable Devices 2 7 A0 SCL SCL 2 7 A0 EP 9 3 Temperature Accuracy 6 A1 Alert A1 Alert 3 6 4 5 A2 GND A2 GND 4 5 40% T = -40C to +125C A * Includes Exposed Thermal Pad (EP) see Table 3-1. V = 3.3V DD 2787 units 30% 20% 10% 0% Temperature Accuracy (C) 2009-2012 Microchip Technology Inc. DS22203C-page 1 Occurrences -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0MCP9804 Hysteresis Shutdown Critical Trip Lock Alarm Window Lock Clear Alert Alert Status Output Control Critical Alert only Band Gap Alert Polarity Temperature Sensor Alert Comp/Int Configuration Temperature ADC T Limit UPPER T Limit LOWER +0.5C T Limit CRITICAL +0.25C +0.125C Manufacturer ID +0.0625C Device ID/Rev Resolution Register Pointer 2 SMBus/Standard I C Interface V GND SDA SCL A0 A1 A2 Alert DD FIGURE 1: Functional Block Diagram. DS22203C-page 2 2009-2012 Microchip Technology Inc.