SBOS527G December   2010  – September 2025 TMP411-Q1 , TMP411D-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  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 (TMP411-Q1)
    6. 6.6  Electrical Characteristics (TMP411D-Q1)
    7. 6.7  Timing Characteristics
    8. 6.8  Timing Diagrams
    9. 6.9  Typical Characteristics (TMP411-Q1)
    10. 6.10 Typical Characteristics (TMP411D-Q1)
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Series Resistance Cancellation
      2. 7.3.2 Differential Input Capacitance
      3. 7.3.3 Temperature Measurement Data
      4. 7.3.4 THERM (PIN 4) and ALERT/ THERM2 (PIN 6)
      5. 7.3.5 Sensor Fault
      6. 7.3.6 Undervoltage Lockout (TMP411-Q1 Only)
      7. 7.3.7 Filtering
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode (SD)
      2. 7.4.2 One-Shot Conversion
    5. 7.5 Programming
      1. 7.5.1  Serial Interface
      2. 7.5.2  Bus Overview
      3. 7.5.3  Timing Diagrams
      4. 7.5.4  Serial Bus Address
      5. 7.5.5  Read/Write Operations
      6. 7.5.6  Time-Out Function
      7. 7.5.7  High-Speed Mode
      8. 7.5.8  General-Call Reset
      9. 7.5.9  Software Reset
      10. 7.5.10 SMBUS Alert Function
  9. 8 Register Map
    1. 8.1  Register Information
    2. 8.2  Pointer Register
    3. 8.3  Temperature Registers
    4. 8.4  Limit Registers
    5. 8.5  Status Register
    6. 8.6  Configuration Register
    7. 8.7  Resolution Register
    8. 8.8  Conversion Rate Register
    9. 8.9  N-factor Correction Register
    10. 8.10 Minimum and Maximum Registers
    11. 8.11 Consecutive Alert Register
    12. 8.12 THERM Hysteresis Register
    13. 8.13 Identification Registers
  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 Curves
    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 Documentation Support
      1. 10.1.1 Related Documentation
    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

8.5 Status Register

The TMP411-Q1 and TMP411D-Q1 have a Status Register to report the state of the temperature comparators. Table 8-2 shows the Status Register bits. The Status Register is read-only from pointer address 02h.

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

The OPEN bit reads as 1 if the remote transistor is detected as OPEN since 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, remains greater than the remote THERM limit, and is less than the value in the shared Hysteresis Register; see Figure 7-9.

The LTHRM bit reads as 1 if the local temperature exceeds the local THERM limit, remains greater than the local THERM limit, and is less than the value in the shared Hysteresis Register; see Figure 7-9.

The LHIGH and RHIGH bit values depend on the state of the AL/TH bit in the Configuration Register. If the AL/TH bit is 0, the LHIGH bit reads as 1 if the local high limit is exceeded since the last clearing of the Status Register. The RHIGH bit reads as 1 if the remote high limit is exceeded since 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 has exceeded the local high limit and remains greater than the local high limit, and less than the value in the Hysteresis Register.

The RHIGH bit reads as 1 if the remote temperature exceeds the remote high limit and remains greater than the remote high limit, and less than 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 is exceeded since the last clearing of the Status Register. The RLOW bit reads as 1 if the remote low limit is exceeded since the last clearing of the Status Register. When there is no remote diode connected and the power supply ramp rate is less than 240V/s, the RLOW flag is set, as well and must be ignored.

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. The values of BUSY, LTHRM, and RTHRM always indicate the current state, and are updated appropriately at the end of the corresponding ADC conversion. Clearing the Status Register bits does not clear the state of the ALERT pin; an SMBus alert response address command must be used to clear the ALERT pin.

The TMP411-Q1 and TMP411D-Q1 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 (This only applies when the ALERT/ THERM2 pin is configured for ALERT mode).

Table 8-2 Status Register Format
STATUS REGISTER (Read = 02h, Write = NA)
BIT #D7D6D5D4D3D2D1D0
BIT NAMEBUSYLHIGHLLOWRHIGHRLOWOPENRTHRMLTHRM
POR VALUE0(1)0000000
(1) The BUSY bit changes to 1 almost immediately (<<100μs) following power up, as the TMP411-Q1 and TMP411D-Q1 begin the first temperature conversion. The BUSY bit is high whenever the TMP411-Q1 and TMP411D-Q1 devices are converting a temperature reading.