SBOSAC5 December   2022 OPT3005

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 Timing Requirements
    7. 7.7 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 Human Eye Matching
      2. 8.3.2 Automatic Full-Scale Range Setting
      3. 8.3.3 Interrupt Operation, INT Pin, and Interrupt Reporting Mechanisms
      4. 8.3.4 I2C Bus Overview
        1. 8.3.4.1 Serial Bus Address
        2. 8.3.4.2 Serial Interface
    4. 8.4 Device Functional Modes
      1. 8.4.1 Automatic Full-Scale Setting Mode
      2. 8.4.2 Interrupt Reporting Mechanism Modes
        1. 8.4.2.1 Latched Window-Style Comparison Mode
        2. 8.4.2.2 Transparent Hysteresis-Style Comparison Mode
        3. 8.4.2.3 End-of-Conversion Mode
        4. 8.4.2.4 End-of-Conversion and Transparent Hysteresis-Style Comparison Mode
    5. 8.5 Programming
      1. 8.5.1 Writing and Reading
        1. 8.5.1.1 High-Speed I2C Mode
        2. 8.5.1.2 General-Call Reset Command
        3. 8.5.1.3 SMBus Alert Response
    6. 8.6 Register Maps
      1. 8.6.1 Internal Registers
        1. 8.6.1.1 Register Descriptions
          1. 8.6.1.1.1 Result Register (offset = 00h)
          2. 8.6.1.1.2 Configuration Register (offset = 01h) [reset = C810h]
          3. 8.6.1.1.3 Low-Limit Register (offset = 02h) [reset = C0000h]
          4. 8.6.1.1.4 High-Limit Register (offset = 03h) [reset = BFFFh]
          5. 8.6.1.1.5 Manufacturer ID Register (offset = 7Eh) [reset = 5449h]
          6. 8.6.1.1.6 Device ID Register (offset = 7Fh) [reset = 3001h]
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Electrical Interface
      2. 9.1.2 Optical Interface
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Optomechanical Design
        2. 9.2.2.2 Dark Window Selection and Compensation
      3. 9.2.3 Application Curves
    3. 9.3 Do's and Don'ts
    4. 9.4 Power-Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
      3. 9.5.3 Soldering and Handling Recommendations
      4. 9.5.4 Mechanical Drawings
  10. 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
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.4.2.1 Latched Window-Style Comparison Mode

The latched window-style comparison mode is typically selected when using the OPT3005 to interrupt an external processor. In this mode, a fault is recognized when the input signal is above the high-limit register or below the low-limit register. When the consecutive fault events trigger the interrupt reporting mechanisms, these mechanisms are latched, thus reporting whether the fault is the result of a high or low comparison. These mechanisms remain latched until the configuration register is read, which clears the INT pin and flag high and flag low fields. The SMBus alert response protocol, described in detail in the SMBus Alert Response section, clears the pin but does not clear the flag high and flag low fields. The behavior of this mode, along with the conversion ready flag, is summarized in Table 8-2. Note that Table 8-2 does not apply when the two threshold low register MSBs (see the Transparent Hysteresis-Style Comparison Mode section for clarification on the MSBs) are set to 11b.

Table 8-2 Latched Window-Style Comparison Mode: Flag Setting and Clearing Summary(2)(4)
OPERATIONFLAG HIGH FIELDFLAG LOW FIELDINT PIN(1)CONVERSION READY FIELD
The result register is above the high-limit register for fault count times. See the Result Register and the High-Limit Register for further details.1XActive1
The result register is below the low-limit register for fault count times. See the Result Register and the Low-Limit Register for further details.X1Active1
The conversion is complete with fault count criterion not metXXX1
Configuration register read(3)00Inactive0
Configuration register write, M[1:0] = 00b (shutdown)XXXX
Configuration register write, M[1:0] > 00b (not shutdown)XXX0
SMBus alert response protocolXXInactiveX
(1) The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low) or when the pin state is inactive and POL = 1 (active high).
(2) X = no change from the previous state.
(3) Immediately after the configuration register is read, the device automatically resets the conversion ready field to the 0 state. Thus, if two configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0.
(4) The high-limit register is assumed to be greater than the low-limit register. If this assumption is incorrect, the flag high field and flag low field can take on different behaviors.