SLOS877C October   2014  – April 2021 TMP451-Q1

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 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Characteristics for Figure 1-1
    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 Temperature Measurement Data
        1. 7.3.1.1 Standard Binary to Decimal Temperature Data Calculation Example
        2. 7.3.1.2 Standard Decimal to Binary Temperature Data Calculation Example
      2. 7.3.2 Series Resistance Cancellation
      3. 7.3.3 Differential Input Capacitance
      4. 7.3.4 Filtering
      5. 7.3.5 Sensor Fault
      6. 7.3.6 ALERT and THERM Functions
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode (SD)
    5. 7.5 Programming
      1. 7.5.1 Serial Interface
        1. 7.5.1.1 Bus Overview
        2. 7.5.1.2 Bus Definitions
        3. 7.5.1.3 Serial Bus Address
        4. 7.5.1.4 Read and Write Operations
        5. 7.5.1.5 Timeout Function
        6. 7.5.1.6 High-Speed Mode
    6. 7.6 Register Map
      1. 7.6.1 Register Information
        1. 7.6.1.1  Pointer Register
        2. 7.6.1.2  Temperature Registers
        3. 7.6.1.3  Status Register
        4. 7.6.1.4  Configuration Register
        5. 7.6.1.5  Conversion Rate Register
        6. 7.6.1.6  One-Shot Start Register
        7. 7.6.1.7  η-Factor Correction Register
        8. 7.6.1.8  Offset Register
        9. 7.6.1.9  General Call Reset
        10. 7.6.1.10 Identification 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
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.1 Temperature Measurement Data

The local and remote temperature sensors have a resolution of 12 bits (0.0625°C). Temperature data that result from conversions within the default measurement range are represented in binary form, as shown in the Standard Binary column of Table 7-1. Any temperature below 0°C results in a data value of 0 (00h). Likewise, temperatures above 127°C result in a value of 127 (7Fh). The device can be set to measure over an extended temperature range by changing bit 2 (RANGE) of configuration register from low to high. The change in measurement range and data format from standard binary to extended binary occurs at the next temperature conversion. For data captured in the extended temperature range configuration, an offset of 64 (40h) is added to the standard binary value, as shown in the EXTENDED BINARY column of Table 7-1. This configuration allows measurement of temperatures as low as –64°C, and as high as 191°C; however, most temperature-sensing diodes only measure with the range of –55°C to 150°C. Additionally, the TMP451-Q1 is specified only for ambient temperatures ranging from –40°C to 125°C; parameters in the Section 6.1 table must be observed.

Table 7-1 Temperature Data Format (Local and Remote Temperature High Bytes)
TEMPERATURE
(°C)		LOCAL AND REMOTE TEMPERATURE REGISTER
HIGH BYTE VALUE (1°C RESOLUTION)
STANDARD BINARY(1)EXTENDED BINARY(2)
BINARYHEXBINARYHEX
–640000 0000000000 000000
–500000 0000000000 11100E
–250000 0000000010 011127
00000 0000000100 000040
10000 0001010100 000141
50000 0101050100 010145
100000 10100A0100 10104A
250001 1001190101 100159
500011 0010320111 001072
750100 10114B1000 10118B
1000110 0100641010 0100A4
1250111 11017D1011 1101BD
1270111 11117F1011 1111BF
1500111 11117F1101 0110D6
1750111 11117F1110 1111EF
1910111 11117F1111 1111FF
(1) Resolution is 1°C/count. Negative values produce a read of 0°C.
(2) Resolution is 1°C/count. All values are unsigned with a –64°C offset.

Both local and remote temperature data use two bytes for data storage. The high byte stores the temperature with 1°C resolution. The second or low byte stores the decimal fraction value of the temperature and allows a higher measurement resolution, as shown in Table 7-2. The measurement resolution for both the local and the remote channels is 0.0625°C.

Table 7-2 Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes)
TEMP
(°C)		TEMPERATURE REGISTER LOW BYTE VALUE
(0.0625°C RESOLUTION)(1)
STANDARD AND EXTENDED BINARYHEX
00000 000000
0.06250001 000010
0.12500010 000020
0.18750011 000030
0.25000100 000040
0.31250101 000050
0.37500110 000060
0.43750111 000070
0.50001000 000080
0.56251001 000090
0.62501010 0000A0
0.68751011 0000B0
0.75001100 0000C0
0.81251101 0000D0
0.87501110 0000E0
0.93851111 0000F0
(1) Resolution is 0.0625°C/count. All possible values are shown.