Datasheet MAX31889 (Maxim)

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MAX31889 ±0.25°C Accurate I2C Temperature Sensor General Description Benefits and Features
The MAX31889 operates from a 1.7V to 3.6V supply volt- ● High Accuracy and Precision age, and is a low-power, high-accuracy digital temperature • ±0.25ºC Accuracy from -20ºC to +105ºC sensor with ±0.25ºC accuracy from -20ºC to +105ºC and • ±0.65ºC Accuracy from -40ºC to +125ºC ± 0.65ºC accuracy from -40ºC to +125ºC. The MAX31889 ● Long Battery Life has 16-bit resolution (0.005ºC). • 1.7V to 3.6V Operating Voltage The device uses a standard I2C serial interface to commu- • 68µA Operating Current During Measurement nicate with a host controller. Two GPIO pins are available. • 0.55µA Standby Current GPIO1 can be configured to trigger a temperature converi- ● Small Size son, while GPIO0 can be configured to generate an inter- • 2mm x 2mm x 0.8mm, 6-Pin μDFN rupt for selectable status bits. ● Safety and Compliance The MAX31889 includes a 32-word FIFO for the tempera- • High and Low Temperature Alarms ture data and also includes high and low threshold digital temperature alarms. The device is available in a 2mm x ● I2C Digital Interface 2mm x 0.8mm, 6-pin, μDFN package. • Configurable Convert Temperature Input Pin • Configurable Interrupt Output Pin
Applications
• 32-Word FIFO for Temperature Data ● Precision Temperature Monitoring • 4 I2C Addresses Available—More Addresses ● RTD Replacement Available by Request ● Internet of Things (IoT) Sensors • Unique ROM IDs Allow Device to Be NIST Traceable
Ordering Information appears at end of data sheet. Simplified Block Diagram
MAX31889 GPIO1 SDA CONTROL LOGIC GPIO0 I2C INTERFACE SCL REGISTERS TEMP GND VDD SENSOR 19-100693; Rev 0; 01/20 Document Outline General Description Applications Benefits and Features Simplified Block Diagram Absolute Maximum Ratings Package Information μDFN Electrical Characteristics Electrical Characteristics (continued) Typical Operating Characteristics Typical Operating Characteristics (continued) Pin Configuration μDFN Pin Description Functional Diagrams Detailed Description Operation Measuring Temperature Alarm Signaling GPIO I2C I2C Slave Address I2C/SMBus Compatible Serial Interface Detailed I2C Timing Diagram Bit Transfer START and STOP Conditions Early STOP Conditions Acknowledge Bit I2C Write Data Format I2C Read Data Format FIFO Description Register Map Register Map Register Details STATUS (0x0) INTERRUPT ENABLE (0x1) FIFO WRITE POINTER (0x04) FIFO READ POINTER (0x05) FIFO OVERFLOW COUNTER (0x06) FIFO DATA COUNTER (0x07) FIFO DATA (0x08) FIFO CONFIGURATION 1 (0x09) FIFO CONFIGURATION 2 (0x0A) SYSTEM CONTROL (0x0C) ALARM HIGH MSB (0x10) ALARM HIGH LSB (0x11) ALARM LOW MSB (0x12) ALARM LOW LSB (0x13) TEMP SENSOR SETUP (0x14) GPIO SETUP (0x20) GPIO CONTROL (0x21) ROM ID 1 (0x31) ROM ID 2 (0x32) ROM ID 3 (0x33) ROM ID 4 (0x34) ROM ID 5 (0x35) ROM ID 6 (0x36) PART IDENTIFIER (0xFF) Applications Information Measurement Considerations Typical Application Circuit Ordering Information Revision History