SCPS277B November   2022  – November 2023 TCAL6408

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 I2C Bus Timing Requirements
    8. 5.8 Switching Characteristics
    9. 5.9 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Voltage Translation
      2. 7.3.2 I/O Port
      3. 7.3.3 Adjustable Output Drive Strength
      4. 7.3.4 Interrupt Output (INT)
      5. 7.3.5 Reset Input (RESET)
      6. 7.3.6 Software Reset Call
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power-On Reset
    5. 7.5 Programming
      1. 7.5.1 I2C Interface
    6. 7.6 Register Maps
      1. 7.6.1 Device Address
      2. 7.6.2 Control Register and Command Byte
      3. 7.6.3 Register Descriptions
      4. 7.6.4 Bus Transactions
        1. 7.6.4.1 Writes
        2. 7.6.4.2 Reads
  9. 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
        1. 8.2.2.1 Minimizing ICC When I/Os Control LEDs
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power-On Reset Requirements
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2.1 Minimizing ICC When I/Os Control LEDs

When the I/Os are used to control LEDs, normally they are connected to VCCP through a resistor as shown in Figure 8-2. For a P-port configured as an input, current consumption increases as VI becomes lower than VCCP. The LED is a diode, with threshold voltage VT, and when a P-port is configured as an input the LED are off, but VI is a VT drop below VCCPCC.

For battery-powered applications, it is essential that the voltage of P-ports controlling LEDs is greater than or equal to VCCP when the P-ports are configured as input to minimize current consumption. Figure 8-2 shows a high-value resistor in parallel with the LED. Figure 8-3 shows VCCP less than the LED supply voltage by at least VT. Both of these methods maintain the I/O VI at or above VCCP and prevent additional supply current consumption when the P-port is configured as an input and the LED is off.

GUID-20220126-SS0I-BBHK-VX1T-8LS6HTCDHDW0-low.gif Figure 8-2 High-Value Resistor in Parallel with LED
GUID-C8AEE4DC-39F1-4785-803F-1C8C5460C6EA-low.gif Figure 8-3 Device Supplied by a Lower Voltage