JAJSI23I September   2009  – October 2019 TMP431 , TMP432

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション回路図
  4. 4 改訂履歴
  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. 12デバイスおよびドキュメントのサポート
    1. 12.1 関連リンク
    2. 12.2 コミュニティ・リソース
    3. 12.3 商標
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.6.4.1 TMP431 Status Register

Table 5. TMP431 Status Register Format

TMP431 STATUS REGISTER (Read = 02h, Write = NA)
BIT # D7 D6 D5 D4 D3 D2 D1 D0
BIT NAME BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM
POR VALUE 0(1) 0 0 0 0 0 0 0
(1) The BUSY bit changes to 1 almost immediately (<< 100 μs) following power-up, as the TMP431 begins the first temperature conversion. It is high whenever the TMP431 is converting a temperature reading.

The TMP431 has a Status Register to report the state of the temperature comparators. Table 5 shows the Status Register bits. The Status Register is read-only and is read by reading from pointer address 02h.

The BUSY bit reads as 1 if the ADC is making a conversion. This bit reads as 0 if the ADC is not converting.

The OPEN bit reads as 1 if the remote transistor is detected as open from the last read of the Status Register. The OPEN status is only detected when the ADC is attempting to convert a remote temperature.

The RTHRM bit reads as 1 if the remote temperature exceeds the remote THERM limit and remains greater than the remote THERM limit less the value in the shared Hysteresis Register; see Figure 18.

The LTHRM bit reads as 1 if the local temperature exceeds the local THERM limit and remains greater than the local THERM limit less the value in the shared Hysteresis Register; see Figure 18.

The LHIGH and RHIGH bit values depend on the state of the AL/TH bit in the Configuration Register 1. If the AL/TH bit is ‘0’, the LHIGH bit reads as 1 if the local high limit was exceeded from the last clearing of the Status Register. The RHIGH bit reads as 1 if the remote high limit was exceeded from the last clearing of the Status Register. If the AL/TH bit is 1, the remote high limit and the local high limit are used to implement a THERM2 function. LHIGH reads as 1 if the local temperature exceeds the local high limit and remains greater than the local high limit less the value in the Hysteresis Register.

The RHIGH bit reads as 1 if the remote temperature has exceeded the remote high limit and remains greater than the remote high limit less the value in the Hysteresis Register.

The LLOW and RLOW bits are not affected by the AL/TH bit. The LLOW bit reads as 1 if the local low limit was exceeded from the last clearing of the Status Register. The RLOW bit reads as 1 if the remote low limit was exceeded from the last clearing of the Status Register.

The values of the LLOW, RLOW, and OPEN (as well as LHIGH and RHIGH when AL/TH is 0) are latched and read as 1 until the Status Register is read or a device reset occurs. These bits are cleared by reading the Status Register, provided that the condition causing the flag to be set no longer exists. The values of BUSY, LTHRM, and RTHRM (as well as LHIGH and RHIGH when ALERT/THERM2 is 1) are not latched and are not cleared by reading the Status Register. They always indicate the current state, and are updated appropriately at the end of the corresponding ADC conversion.

The TMP431 NORs LHIGH, LLOW, RHIGH, RLOW, and OPEN, so a status change for any of these flags from 0 to 1 automatically causes the ALERT pin to go low (only applies when the ALERT/THERM2 pin is configured for ALERT mode).