SCPS164D MAY   2007  – February 2017 TCA6507

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 I2C Interface Timing Requirements
    7. 6.7 Oscillator Timing Requirements
    8. 6.8 Switching Characteristics
    9. 6.9 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Seven LED Driver Outputs
      2. 8.3.2 Open-Drain Outputs Directly Drive LEDs
      3. 8.3.3 Widely Programmable
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-On Reset
      2. 8.4.2 Enable and Reset
    5. 8.5 Programming
      1. 8.5.1 I2C Interface
      2. 8.5.2 Bus Transactions
        1. 8.5.2.1 Writes
        2. 8.5.2.2 Reads
      3. 8.5.3 Device Address
      4. 8.5.4 Control Register and Command Byte
      5. 8.5.5 Auto-Increment Mode
      6. 8.5.6 LED Operation
      7. 8.5.7 Blinking Pattern Control
      8. 8.5.8 Intensity Control
    6. 8.6 Register Maps
      1. 8.6.1 Registers 0x00 - 0x02 (Select Registers)
      2. 8.6.2 Register 0x03 (Fade-ON Time)
      3. 8.6.3 Register 0x04 (Fully-ON Time)
      4. 8.6.4 Register 0x05 (Fade-OFF Time)
      5. 8.6.5 Register 0x06 - 0x07 (Fully-OFF Time)
      6. 8.6.6 Register 0x08 (Maximum Intensity per Bank)
      7. 8.6.7 Register 0x09 (One-Shot / Master Intensity)
      8. 8.6.8 Register 0x0A (Initialization Register)
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
    3. 9.3 System Example
  10. 10Power Supply Recommendations
    1. 10.1 Power-On Reset Requirements
  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
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers must validate and test their design implementation to confirm system functionality.

9.1 Application Information

Applications of the TCA6507 contains an I2C (or SMBus) master device. The TCA6507 is used to control the blinking pattern of LEDs or as a general purpose output.

9.2 Typical Application

Figure 23 shows a general application in which the TCA6507 can be used. Each LED output is driving one LED. Figure 26 highlights another application where the TPS61052 boost converter and high-power LED driver and TCA6507 7-bit LED driver can be used in combination for applications requiring flashlight functionality and/or high-brightness indicator/backlight LEDs.

TCA6507 ai_typ_app_cps164.gif Figure 23. Typical Application

9.2.1 Design Requirements

For the typical application example, the TCA6507 is set up to blink the P0 with Bank0 pattern, P1 fully on, and P2 with Bank1 blinking pattern. The banks is setup to the flashing pattern defined in Figure 24. The options for lengths of time for each section can be seen in Table 7.

TCA6507 TypAppPattern.gif Figure 24. Blinking Pattern for the Two Banks

9.2.2 Detailed Design Procedure

For the typical application blinking pattern seen in Figure 24, the desired values are listed in Table 23, with the corresponding registers and values.

Table 23. LED Pattern

SECTION BANK1 VALUE BANK0 VALUE UNIT REGISTER BANK1 NIBBLE (HEX) BANK0 NIBBLE (HEX) REGISTER VALUE (HEX)
Fade-ON time 256 1024 ms 0x03 0x4 0x8 0x48
Fully-ON time 512 512 ms 0x04 0x6 0x6 0x66
Fade-OFF time 512 1024 ms 0x05 0x6 0x8 0x68
First fully-OFF time 1024 512 ms 0x06 0x8 0x6 0x86
Second fully-OFF time 1024 2048 ms 0x07 0x8 0xA 0x8A
Maximum brightness 62.5 100 % 0x08 0x9 0xF 0x9F

The select register values are shown in Table 24.

Table 24. Select Registers

REGISTER VALUE
(BINARY)		 VALUE
(HEX)
NAME ADDRESS
SELECT0 0x00 8b0000 0100 0x04
SELECT1 0x01 8b0000 0101 0x05
SELECT2 0x02 8b0000 0111 0x07

With the above values for the appropriate registers, the next step must be to write the values to the device. This can be accomplished very easily with the auto-increment feature (see the Auto-Increment Mode section for more information).

Table 25. Writing to Registers

BYTE # BYTE DESCRIPTION
1 0x89 Address and write bit
2 0x10 Command byte with auto-increment
3 0x04 Write to SELECT0 register
4 0x05 Write to SELECT1 register
5 0x06 Write to SELECT2 register
6 0x48 Write to Fade-ON Time register
7 0x66 Write to Fully-ON Time register
8 0x68 Write to Fade-OFF Time register
9 0x86 Write to First Fully-OFF Time register
10 0x8A Write to Second Fully-OFF Time register
11 0x9F Write to Maximum Brightness register

After the above bytes in Table 25 are written to the device, the LEDs blinks according to the defined pattern.

9.2.3 Application Curve

TCA6507 led_intens_max100.gif Figure 25. Output Port Voltage vs LED Intensity, Maximum Intensity = 100%

9.3 System Example

Figure 26 highlights another application where the TPS61052 boost converter and high-power LED driver and TCA6507 7-bit LED driver can be used in combination for applications requiring flashlight functionality, high-brightness indicator and backlight LEDs, or both.

TCA6507 fig16_cps164.gif Figure 26. White LED Flashlight Driver and High-Brightness LED Indicator/Backlight Power Supply