SNIS139F February   2005  – January 2024 LM95231

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Operating Ratings
    3. 5.3 Temperature-to-Digital Converter Characteristics
    4. 5.4 Logic Electrical Characteristics Digital DC Characteristics
    5. 5.5 Logic Electrical Characteristics SMBus Digital Switching Characteristics
    6. 5.6 Typical Performance Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Conversion Sequence
      2. 6.3.2 Power-On-Default States
      3. 6.3.3 SMBus Interface
      4. 6.3.4 Temperature Data Format
      5. 6.3.5 SMBDAT Open-Drain Output
      6. 6.3.6 Diode Fault Detection
      7. 6.3.7 Communicating with the LM95231
      8. 6.3.8 Serial Interface Reset
      9. 6.3.9 One-Shot Conversion
  8. 7 Registers
    1. 7.1 LM95231 Registers
    2. 7.2 Status Register
    3. 7.3 Configuration Register
    4. 7.4 Remote Diode Filter Control Register
    5. 7.5 Remote Diode Model Type Select Register
    6. 7.6 Remote TruTherm Mode Control
    7. 7.7 Local and Remote MSB and LSB Temperature Registers
      1. 7.7.1 Local Temperature MSB
      2. 7.7.2 Local Temperature LSB
      3. 7.7.3 Remote Temperature MSB
      4. 7.7.4 Remote Temperature LSB
    8. 7.8 Manufacturers ID Register
    9. 7.9 Die Revision Code Register
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Diode Non-Ideality
        1. 8.2.1.1 Diode Non-Ideality Factor Effect on Accuracy
        2. 8.2.1.2 Calculating Total System Accuracy
        3. 8.2.1.3 Compensating for Different Non-Ideality
  10. 9 Layout
    1. 9.1 PCB Layout for Minimizing Noise
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.3.4 Temperature Data Format

Temperature data can only be read from the Local and Remote Temperature registers .

Remote temperature data with the digital filter off is represented by an 11-bit, two's complement word or unsigned binary word with an LSb (Least Significant Bit) equal to 0.125°C. The data format is a left justified 16-bit word available in two 8-bit registers. Unused bits will always report "0".

Table 6-1 11-bit, 2's complement (10-bit plus sign)
TemperatureDigital Output
BinaryHex
+125°C0111 1101 0000 00007D00h
+25°C0001 1001 0000 00001900h
+1°C0000 0001 0000 00000100h
+0.125°C0000 0000 0010 00000020h
0°C0000 0000 0000 00000000h
−0.125°C1111 1111 1110 0000FFE0h
−1°C1111 1111 0000 0000FF00h
−25°C1110 0111 0000 0000E700h
−55°C1100 1001 0000 0000C900h
Table 6-2 11-bit, unsigned binary
TemperatureDigital Output
BinaryHex
+255.875°C1111 1111 1110 0000FFE0h
+255°C1111 1111 0000 0000FF00h
+201°C1100 1001 0000 0000C900h
+125°C0111 1101 0000 00007D00h
+25°C0001 1001 0000 00001900h
+1°C0000 0001 0000 00000100h
+0.125°C0000 0000 0010 00000020h
0°C0000 0000 0000 00000000h

Remote temperature data with the digital filter on is represented by a 13-bit, two's complement word or unsigned binary word with an LSb (Least Significant Bit) equal to 0.03125°C (1/32°C). The data format is a left justified 16-bit word available in two 8-bit registers. Unused bits will always report "0".

Table 6-3 13-bit, 2's complement (12-bit plus sign)
Temperature Digital Output
Binary Hex
+125°C 0111 1101 0000 0000 7D00h
+25°C 0001 1001 0000 0000 1900h
+1°C 0000 0001 0000 0000 0100h
+0.03125°C 0000 0000 0000 1000 0008h
0°C 0000 0000 0000 0000 0000h
−0.03125°C 1111 1111 1111 1000 FFF8h
−1°C 1111 1111 0000 0000 FF00h
−25°C 1110 0111 0000 0000 E700h
−55°C 1100 1001 0000 0000 C900h
Table 6-4 13-bit, unsigned binary
TemperatureDigital Output
BinaryHex
+255.875°C1111 1111 1110 0000FFE0h
+255°C1111 1111 0000 0000FF00h
+201°C1100 1001 0000 0000C900h
+125°C0111 1101 0000 00007D00h
+25°C0001 1001 0000 00001900h
+1°C0000 0001 0000 00000100h
+0.03125°C0000 0000 0000 10000008h
0°C0000 0000 0000 00000000h

Local Temperature data is represented by a 10-bit, two's complement word with an LSb (Least Significant Bit) equal to 0.25°C. The data format is a left justified 16-bit word available in two 8-bit registers. Unused bits will always report "0". Local temperature readings greater than +127.875°C are clamped to +127.875°C, they will not roll-over to negative temperature readings.

TemperatureDigital Output
BinaryHex
+125°C0111 1101 0000 00007D00h
+25°C0001 1001 0000 00001900h
+1°C0000 0001 0000 00000100h
+0.25°C0000 0000 0100 00000040h
0°C0000 0000 0000 00000000h
−0.25°C1111 1111 1100 0000FFC0h
−1°C1111 1111 0000 0000FF00h
−25°C1110 0111 0000 0000E700h
−55°C1100 1001 0000 0000C900h