SBOS371B August   2006  – October 2014 TMP401

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: V+ = 3 V to 5.5 V
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Standard and Extended Temperature Measurement Range
      2. 7.3.2 Remote Sensing
    4. 7.4 Device Functional Modes
      1. 7.4.1 SMBus Alert Function
      2. 7.4.2 THERM (Pin 4) and ALERT/THERM2 (Pin 6)
      3. 7.4.3 Sensor Fault
      4. 7.4.4 High-Speed Mode
      5. 7.4.5 Shutdown Mode (SD)
      6. 7.4.6 One-Shot Conversion
      7. 7.4.7 General-Call Reset
    5. 7.5 Programming
      1. 7.5.1 Bus Overview
      2. 7.5.2 Serial Interface
      3. 7.5.3 Serial Bus Address
      4. 7.5.4 Read and Write Operations
      5. 7.5.5 Timeout Function
      6. 7.5.6 Timing Diagrams
    6. 7.6 Register Maps
      1. 7.6.1  Pointer Register
      2. 7.6.2  Temperature Registers
      3. 7.6.3  Limit Registers
      4. 7.6.4  Status Register
      5. 7.6.5  Configuration Register
      6. 7.6.6  Resolution Register
      7. 7.6.7  Conversion Rate Register
      8. 7.6.8  Identification Registers
      9. 7.6.9  Consecutive Alert Register
      10. 7.6.10 THERM Hysteresis Register
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Filtering
      3. 8.2.3 Application Curves
        1. 8.2.3.1 Series Resistance Cancellation
        2. 8.2.3.2 Differential Input Capacitance
  9. 9 Power-Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Measurement Accuracy and Thermal Considerations
      2. 10.1.2 Layout Considerations
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • ±1°C Remote Diode Sensor
  • ±3°C Local Temperature Sensor
  • Series Resistance Cancellation
  • THERM Flag Output
  • ALERT/THERM2 Flag Output
  • Programmable Over- and Undertemperature Limits
  • Programmable Resolution: 9- to 12-Bit
  • Diode Fault Detection
  • SMBus-Compatible

2 Applications

  • Servers and Workstations
  • Desktop and Notebook Computers
  • Telecom and Network Infrastructure
  • Set Top Boxes

3 Description

The TMP401 is a remote temperature sensor monitor with a built-in local temperature sensor. The remote sensor is capable of monitoring the temperature of any external PN junction. Typical sense elements include low-cost NPN- or PNP-type transistors and diodes, or accessible thermal diodes integrated within microcontrollers, microprocessors, or field-programmable gate arrays (FPGAs).

The accuracy of the remote sensor is ±1°C for multiple IC manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to program alarm thresholds and to read temperature data.

Features included in the TMP401 are series resistance cancellation, wide remote temperature measurement range (up to +150°C), diode fault detection, and temperature alert functions.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TMP401 VSSOP (8) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

alt_sbos371b.gif