SBOS441I September   2009  – October 2019 TMP431 , TMP432

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Schematics
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Requirements
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Temperature Measurement Data
      2. 8.3.2 Beta Compensation
      3. 8.3.3 Series Resistance Cancellation
      4. 8.3.4 Differential Input Capacitance
      5. 8.3.5 Filtering
      6. 8.3.6 Sensor Fault
      7. 8.3.7 THERM and ALERT/THERM2
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode (SD)
      2. 8.4.2 One-Shot Mode
    5. 8.5 Programming
      1. 8.5.1  Serial Interface
      2. 8.5.2  Bus Overview
      3. 8.5.3  Timing Diagrams
      4. 8.5.4  Serial Bus Address
      5. 8.5.5  Read and Write Operations
      6. 8.5.6  Undervoltage Lockout
      7. 8.5.7  Timeout Function
      8. 8.5.8  High-Speed Mode
      9. 8.5.9  General Call Reset
      10. 8.5.10 SMBus Alert Function
    6. 8.6 Register Maps
      1. 8.6.1  Pointer Register
      2. 8.6.2  Temperature Registers
      3. 8.6.3  Limit Registers
      4. 8.6.4  Status Registers
        1. 8.6.4.1 TMP431 Status Register
        2. 8.6.4.2 TMP432 Status Register
      5. 8.6.5  Configuration Register 1
      6. 8.6.6  Configuration Register 2
      7. 8.6.7  Conversion Rate Register
      8. 8.6.8  Beta Compensation Configuration Register
      9. 8.6.9  η-Factor Correction Register
      10. 8.6.10 Software Reset
      11. 8.6.11 Consecutive Alert Register
      12. 8.6.12 Therm Hysteresis Register
      13. 8.6.13 Identification Registers
      14. 8.6.14 Open Status Register
      15. 8.6.15 Channel Mask Register
      16. 8.6.16 High Limit Status Register
      17. 8.6.17 Low Limit Status Register
      18. 8.6.18 THERM Limit Status Register
  9. 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
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.6.6 Configuration Register 2

Configuration Register 2 (pointer address 1Ah for the TMP431 and 3Fh for the TMP432) controls which temperature measurement channels are enabled and whether the external channels have the resistance correction feature enabled or not.

The RC bit enables the resistance correction feature for the external temperature channels. If RC = 1, series resistance correction is enabled; if RC = 0, resistance correction is disabled. Resistance correction must be enabled for most applications. However, disabling the resistance correction can yield slightly improved temperature measurement noise performance, and reduce conversion time by about 50%, which could lower power consumption when conversion rates of two per second or less are selected.

The LEN bit enables the local temperature measurement channel. If LEN = 1, the local channel is enabled; if LEN = 0, the local channel is disabled.

The REN bit enables external temperature measurement channel 1 (connected to pins 2 and 3.) If REN = 1, the external channel is enabled; if REN = 0, the external channel is disabled.

For the TMP432 only, the REN2 bit enables the second external measurement channel (connected to pins 4 and 5). If REN2 = 1, the second external channel is enabled; if REN2 = 0, the second external channel is disabled.

The temperature measurement sequence is local channel, external channel 1, external channel 2, shutdown, and delay (to set conversion rate, if necessary). The sequence starts over with the local channel. If any of the channels are disabled, they are skipped in the sequence. Table 8 summarizes the bits of Configuration Register 2.

Table 8. Configuration Register 2 Bit Descriptions

CONFIGURATION REGISTER 2
(Read, Write = 1 A for TMP431 3F for TMP432; POR = 1Ch for TMP431; 3Ch for TMP432)
BIT NAME FUNCTION POWER-ON RESET VALUE
7, 6 Reserved — 0
5 REN2 0 = External channel 2 disabled
1 = External channel 2 enabled		 0 (TMP431)
1 (TMP432)
4 REN 0 = External channel 1 disabled
1 = External channel 1 enabled		 1
3 LEN 0 = Local channel disabled
1 = Local channel enabled		 1
2 RC 0 = Resistance correction disabled
1 = Resistance correction enabled		 1
1, 0 Reserved — 0