SLOS887F September   2014  – June 2022 TMP112-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Specifications for User-Calibrated Systems
    7. 7.7 Timing Requirements
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Digital Temperature Output
      2. 8.3.2 Serial Interface
        1. 8.3.2.1 Bus Overview
        2. 8.3.2.2 Serial Bus Address
        3. 8.3.2.3 Writing and Reading Operation
        4. 8.3.2.4 Target Mode Operation
          1. 8.3.2.4.1 Target Receiver Mode
          2. 8.3.2.4.2 Target Transmitter Mode
        5. 8.3.2.5 SMBus Alert Function
        6. 8.3.2.6 General Call
        7. 8.3.2.7 High-Speed (Hs) Mode
        8. 8.3.2.8 Timeout Function
        9. 8.3.2.9 Timing Diagrams
          1. 8.3.2.9.1 Two-Wire Timing Diagrams
    4. 8.4 Device Functional Modes
      1. 8.4.1 Continuous-Conversion Mode
      2. 8.4.2 Extended Mode (EM)
      3. 8.4.3 Shutdown Mode (SD)
      4. 8.4.4 One-Shot and Conversion Ready Mode (OS)
      5. 8.4.5 Thermostat Mode (TM)
        1. 8.4.5.1 Comparator Mode (TM = 0)
        2. 8.4.5.2 Interrupt Mode (TM = 1)
    5. 8.5 Programming
      1. 8.5.1 Pointer Register
      2. 8.5.2 Temperature Register
      3. 8.5.3 Configuration Register
        1. 8.5.3.1 Shutdown Mode (SD)
        2. 8.5.3.2 Thermostat Mode (TM)
        3. 8.5.3.3 Polarity (POL)
        4. 8.5.3.4 Fault Queue (F1/F0)
        5. 8.5.3.5 Converter Resolution (R1 and R0)
        6. 8.5.3.6 One-Shot (OS)
        7. 8.5.3.7 Extended Mode (EM)
        8. 8.5.3.8 Alert (AL)
        9. 8.5.3.9 Conversion Rate (CR)
      4. 8.5.4 High- and Low-Limit Registers
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Calibrating for Improved Accuracy
        1. 9.1.1.1 Example 1: Finding Worst-Case Accuracy From –15°C to 50°C
        2. 9.1.1.2 Example 2: Finding Worst-Case Accuracy From 25°C to 100°C
      2. 9.1.2 Using The Slope Specifications With a 1-Point Calibration
        1. 9.1.2.1 Power Supply-Level Contribution to Accuracy
    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 Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.5.4 High- and Low-Limit Registers

The temperature limits are stored in the T(LOW) and T(HIGH) registers in the same format as the temperature result, and their values are compared to the temperature result on every conversion. The outcome of the comparison drives the behavior of the ALERT pin, which operates as a comparator output or an interrupt, and is set by the TM bit in the configuration register.

In Comparator mode (TM = 0), the ALERT pin becomes active when the temperature equals or exceeds the value in the T(HIGH) register and generates a consecutive number of faults according to fault bits F1 and F0. The ALERT pin remains active until the temperature falls below the indicated T(LOW) value for the same number of faults.

In interrupt mode (TM = 1), the ALERT pin becomes active when the temperature equals or exceeds the value in T(HIGH) for a consecutive number of fault conditions (as shown in Table 8-10). The ALERT pin remains active until a read operation of any register occurs, or the device successfully responds to the SMBus alert response address. The ALERT pin is also cleared if the device is placed in shutdown mode. When the ALERT pin is cleared, it becomes active again only when temperature falls below T(LOW), and remains active until cleared by a read operation of any register or a successful response to the SMBus alert response address. When the ALERT pin is cleared, the above cycle repeats, with the ALERT pin becoming active when the temperature equals or exceeds T(HIGH). The ALERT pin can also be cleared by resetting the device with the general-call Reset command. This action also clears the state of the internal registers in the device, returning the device to comparator mode (TM = 0).

Both operating modes are represented in Figure 8-9. Table 8-11 and Table 8-12 list the format for the T(HIGH) and T(LOW) registers. The most significant byte is sent first, followed by the least significant byte. The power-up reset values for T(HIGH) and T(LOW) are:

  • T(HIGH) = 80°C
  • T(LOW) = 75°C

The format of the data for T(HIGH) and T(LOW) is the same as for the temperature register.

Table 8-11 Bytes 1 and 2 of T(HIGH) Register(1)
BYTED7D6D5D4D3D2D1D0
1H11H10H9H8H7H6H5H4
(H12)(H11)(H10)(H9)(H8)(H7)(H6)(H5)
2H3H2H1H00000
(H4)(H3)(H2)(H1)(H0)(0)(0)(0)
(1) Extended mode 13-bit configuration shown in parenthesis.
Table 8-12 Bytes 1 and 2 of T(LOW) Register(1)
BYTED7D6D5D4D3D2D1D0
1L11L10L9L8L7L6L5L4
(L12)(L11)(L10)(L9)(L8)(L7)(L6)(L5)
2L3L2L1L00000
(L4)(L3)(L2)(L1)(L0)(0)(0)(0)
(1) Extended mode 13-bit configuration shown in parenthesis.