SLOS877C October   2014  – April 2021 TMP451-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Characteristics for Figure 1-1
    7. 6.7 Typical Characteristics
  7. 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 Standard Binary to Decimal Temperature Data Calculation Example
        2. 7.3.1.2 Standard Decimal to Binary Temperature Data Calculation Example
      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
    6. 7.6 Register Map
      1. 7.6.1 Register Information
        1. 7.6.1.1  Pointer Register
        2. 7.6.1.2  Temperature Registers
        3. 7.6.1.3  Status Register
        4. 7.6.1.4  Configuration Register
        5. 7.6.1.5  Conversion Rate Register
        6. 7.6.1.6  One-Shot Start Register
        7. 7.6.1.7  η-Factor Correction Register
        8. 7.6.1.8  Offset Register
        9. 7.6.1.9  General Call Reset
        10. 7.6.1.10 Identification Register
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

7.6.1.4 Configuration Register

The configuration register sets the temperature range, the ALERT/ THERM modes, and controls the shutdown mode. The configuration register is set by writing to pointer address 09h, and read by reading from pointer address 03h. Table 7-6 summarizes the bits of configuration register.

Table 7-6 Configuration Register Bit Descriptions
CONFIGURATION REGISTER (READ = 03h, WRITE = 09h, POR = 00h)
BIT NUMBERNAMEFUNCTIONPOWER-ON RESET VALUE
7MASK10 = ALERT Enabled
1 = ALERT Masked		0
6SD0 = Run
1 = Shut down		0
5ALERT/ THERM20 = ALERT
1 = THERM2		0
4:3Reserved—0
2RANGE0 = 0°C to +127°C
1 = –64°C to +191°C		0
1:0Reserved—0

MASK1 (bit 7) of the configuration register masks the ALERT output. If MASK1 is 0 (default), the ALERT output is enabled. If MASK1 is set to 1, the ALERT output is disabled. This configuration applies only if the value of ALERT/ THERM2 (bit 5) is 0 (that is, pin 6 is configured as the ALERT output). If pin 6 is configured as the THERM2 output, the value of the MASK1 bit has no effect.

The shutdown bit (SD, bit 6) enables or disables the temperature-measurement circuitry. If SD = 0 (default), the TMP451-Q1 device converts continuously at the rate set in the conversion rate register. When SD is set to 1, the TMP451-Q1 device stops converting when the current conversion sequence is complete and enters a shutdown mode. When SD is set to 0 again, the TMP451-Q1 resumes continuous conversions. When SD = 1, a single conversion can be started by writing to the one-shot start register. See the Section 7.6.1.6 section for more information.

ALERT/ THERM2 (bit 5) sets the configuration of pin 6. If the ALERT/ THERM2 bit is 0 (default), then pin 6 is configured as the ALERT output; if it is set to 1, then pin 6 is configured as the THERM2 output.

The temperature range is set by configuring RANGE (bit 2) of the configuration register. Setting this bit low (default) configures the TMP451-Q1 device for the standard measurement range (0°C to 127°C); temperature conversions are stored in the standard binary format. Setting bit 2 high configures the TMP451-Q1 device for the extended measurement range (–64°C to 191°C); temperature conversions are stored in the extended binary format (see Table 7-1).

The remaining bits of the configuration register are reserved and must always be set to 0. The power-on reset value for this register is 00h.