SCPS130H August   2005  – March 2021 PCA9539

PRODUCTION DATA  

  1. 1 Features
  2. 2 Description
  3. 3 Revision History
  4. 4 Description (Continued)
  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 Resistance Characteristics
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Interface Timing Requirements
    7. 6.7 RESET Timing Requirements
    8. 6.8 Switching Characteristics
    9. 6.9 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Functional Block Diagram
    2. 8.2 Device Functional Modes
      1. 8.2.1 RESET Input
        1. 8.2.1.1 RESET Errata
          1. 8.2.1.1.1 System Impact
          2. 8.2.1.1.2 System Workaround
      2. 8.2.2 Power-On Reset
      3. 8.2.3 I/O Port
      4. 8.2.4 Interrupt ( INT) Output
        1. 8.2.4.1 Interrupt Errata
          1. 8.2.4.1.1 System Impact
          2. 8.2.4.1.2 System Workaround
    3. 8.3 Programming
      1. 8.3.1 I2C Interface
      2. 8.3.2 Register Map
        1. 8.3.2.1 Device Address
        2. 8.3.2.2 Control Register And Command Byte
        3. 8.3.2.3 Register Descriptions
        4. 8.3.2.4 Bus Transactions
          1. 8.3.2.4.1 Writes
          2. 8.3.2.4.2 Reads
  9. 9 Application Information Disclaimer
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Detailed Design Procedure
        1. 9.2.1.1 Minimizing ICC When I/O Is Used To Control Led
  10. 10Power Supply Recommendations
    1. 10.1 Power-On Reset Requirements
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.1.1 Minimizing ICC When I/O Is Used To Control Led

When an I/O is used to control an LED, normally it is connected to VCC through a resistor (see Figure 9-1). Because the LED acts as a diode, when the LED is off, the I/O VIN is about 1.2 V less than VCC. The ΔICC parameter in Electrical Characteristics shows how ICC increases as VIN becomes lower than VCC. For battery-powered applications, it is essential that the voltage of I/O pins is greater than or equal to VCC, when the LED is off, to minimize current consumption.

Figure 9-2 shows a high-value resistor in parallel with the LED. Figure 9-3 shows VCC less than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O VCC at or above VCC and prevent additional supply-current consumption when the LED is off.

GUID-55149E2B-1E3C-41BB-A07F-3C9B80CF8B1A-low.gifFigure 9-2 High-Value Resistor In Parallel With Led
GUID-D6A509B0-C67F-43CB-BF61-F49FDFB861F6-low.gifFigure 9-3 Device Supplied By Lower Voltage