SLLS228G December   1995  – August 2015 TIR1000

UNLESS OTHERWISE NOTED, this document contains 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 Switching Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 IrDA Encoder Function
      2. 7.4.2 IrDA Decoder Function
  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 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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8 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 should validate and test their design implementation to confirm system functionality.

8.1 Application Information

IrDA provides several specifications for a complete set of protocols for wireless infrared communications.

8.2 Typical Application

A simple application of the TIR1000 device is developing a system with an optoelectronics device and a UART device (TL16C500C). Hence, the TIR1000 device interfaces between the infrared and serial devices.

TIR1000 TIR1000I Basic_TL16C550C_Config_SLLS228.gifFigure 9. Typical Application Schematic

8.2.1 Design Requirements

Table 1 lists the design requirements for the typical application.

Table 1. Design Requirements

DESIGN PARAMETER EXAMPLE VALUE
Power supply 3 V (low voltage)
1.843-MHz clock source Crystal
Baud rate 115.2 kbps
TRANSMITTER
Peak wavelength 850–900 nm
Intensity in angular range 40–500 mW/Sr
Half angle ±15-30°
Pulse Duration at 115.2 kbps 2.23 µs
RECEIVER
Irradiance in angular range 4–500 mW/cm2
Half angle ±15°
Receiver latency 10 ms

8.2.2 Detailed Design Procedure

The asynchronous communications element (TL16C550C) contains a programmable baud generator that takes a clock input in the range between DC and 16 MHz and divides it by a divisor in the range between
1 and (216 – 1). The output frequency of the baud generator is sixteen times (16×) the baud rate. The formula for the divisor is shown in Equation 1.

Equation 1. divisor = XIN frequency input / (desired baud rate × 16)

For example:

Equation 2. divisor = 1.843 MHz / (115.2 kbps × 16) = 0.9999

Error (divisor) <1%

TIR1000 TIR1000I Typ_Clock_Circuits_SLLS228.gifFigure 10. Typical Clock Circuits (Programmable Baud Generator)

Table 2. Typical Crystal Oscillator Network

CRYSTAL Rp RX2 C1 C2
1.8432 MHz 1 MΩ 1.5 kΩ 10–30 pF 40–60 pF

8.2.3 Application Curves

TIR1000 TIR1000I App_curve_rise_time_SLLS228.png
Figure 11. Rise Time of IR_TXD (Data)
TIR1000 TIR1000I App_curve_fall_time_SLLS228.png
Figure 12. Fall Time of IR_TXD (Data)