SNIS241 September   2025 TMP461-EP

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Information
  6. 5 Pin Configuration and Functions
  7. 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 Two-Wire Timing Requirements
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 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 Decoding Temperature Data
      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
      2. 7.5.2 General-Call Reset
  9. 8 Register Map
    1. 8.1 Register Information
      1. 8.1.1  Pointer Register
      2. 8.1.2  Local and Remote Temperature Registers
      3. 8.1.3  Status Register
      4. 8.1.4  Configuration Register
      5. 8.1.5  Conversion Rate Register
      6. 8.1.6  One-Shot Start Register
      7. 8.1.7  Channel Enable Register
      8. 8.1.8  Consecutive ALERT Register
      9. 8.1.9  η-Factor Correction Register
      10. 8.1.10 Remote Temperature Offset Register
      11. 8.1.11 Manufacturer Identification Register
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Related Documentation
    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

7.3.1.1 Decoding Temperature Data

The TMP461-EP temperature registers use a 12-bit format. The 12 bits are aligned to the left side, or most significant side, of the 16-bit word. The four unused bits are on the right side, or the least significant side. For this reason, a shift is needed to discard the extra bits. 2’s complement is employed to describe negative temperatures. C code can easily convert the 2’s complement data when the data is typecast into the correct signed data type. Q notation describes the number of bits that represent a fractional result. 4 bits of fractional data, known as Q4, offers 0.0625°C resolution.

Table 7-3 12-Bit Q4 Encoding Parameters

PARAMETER

VALUE

Bits12
Q4
Resolution0.0625
Range (+)127.9375
Range (-)-128
First Byte Integer CYes
25˚C0x1900
Table 7-4 12-Bit Q4 Bit Values
1514131211109876543210
Sign64321684210.50.250.1250.0625----
-12864321684211/21/41/81/16----

-27

26

25

24

23

22

21

20

2-1

2-2

2-3

2-4

-

-

-

-

/* 12-bit format has 4 bits discarded by right shift
   q4 is 0.062500 resolution
   the following bytes represent 24.5C */
uint8_t byte1 = 0x18;
uint8_t byte2 = 0x80;
float f = (((int8_t) byte1 << 8 | byte2) >> 4) * 0.0625f;
int mC = (((int8_t) byte1 << 8 | byte2) >> 4) * 1000 >> 4;
int C = (int8_t) byte1;