TIR1000PS

Product Folder Sample & Buy Support & Community Tools & Software Technical Documents TIR1000, TIR1000I SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 TIR1000x Standalone IrDA™ Encoder and Decoder 1 Features 3 Description • The TIR1000x serial infrared (SIR) encoder and decoder is a CMOS device that encodes and decodes bit data in conformance with the IrDA specification. 1 • • • • • • Adds Infrared (IR) Port to Universal Asynchronous Receiver Transmitter (UART) Compatible With Infrared Data Association (IrDA™) and Hewlett Packard Serial Infrared (HPSIR) Provides 1200-bps to 115-kbps Data Rate Operates from 2.7 V to 5.5 V Provides Simple Interface With UART Decodes Negative or Positive Pulses Available in Two 8-Terminal Plastic Small Outline Packages (PSOP) – PS Package Has Slightly Larger Dimensions Than PW Package A transceiver device is needed to interface to the photo-sensitive diode (PIN) and the light emitting diode (LED). A UART is needed to interface to the serial data lines. Device Information(1) PART NUMBER TIR1000x PACKAGE BODY SIZE (NOM) TSSOP (8) 3.00 mm × 4.40 mm SO (8) 6.20 mm × 5.30 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. 2 Applications • • UART Interfacing Infrared Data Communications Functional Block Diagram RESET IR_RXD Decoder U_RXD Encoder IR_TXD 16XCLK U_TXD 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA. TIR1000, TIR1000I SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 3 6.1 6.2 6.3 6.4 6.5 6.6 3 4 4 4 4 5 Absolute Maximum Ratings ...................................... ESD Ratings ............................................................ Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics........................................... Switching Characteristics .......................................... Detailed Description .............................................. 6 7.1 Overview ................................................................... 6 7.2 Functional Block Diagram ......................................... 6 7.3 Feature Description................................................... 6 7.4 Device Functional Modes.......................................... 7 8 Application and Implementation .......................... 9 8.1 Application Information.............................................. 9 8.2 Typical Application ................................................... 9 9 Power Supply Recommendations...................... 11 10 Layout................................................................... 12 10.1 Layout Guidelines ................................................. 12 10.2 Layout Example .................................................... 12 11 Device and Documentation Support ................. 13 11.1 11.2 11.3 11.4 Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 13 13 13 13 12 Mechanical, Packaging, and Orderable Information ........................................................... 13 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision F (July 1999) to Revision G Page • Added Applications, Pin Configuration and Functions section, ESD Ratings table, Typical Characteristics section, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section ..................................................................................................................... 1 • Added PS package drawing ................................................................................................................................................... 3 • Changed tr output rise time FROM: 1.3 ns TO: 23.8 ns in Switching Characteristics ........................................................... 5 • Changed tf output fall time FROM: 1.8 ns TO: 9.2 ns in Switching Characteristics .............................................................. 5 2 Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 TIR1000, TIR1000I www.ti.com SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 5 Pin Configuration and Functions PS Package 8-Pin SO Top View PW Package 8-Pin TSSOP Top View 16XCLK 1 8 VCC U_TXD 2 7 IR_TXD U_RXD 3 6 IR_RXD GND 4 5 RESET 16XCLK U_TXD U_RXD GND 8 7 6 5 1 2 3 4 VCC IR_TXD IR_RXD RESET Pin Functions PIN NAME NO. I/O DESCRIPTION Clock signal. 16XCLK must be set to 16 times the baud rate. The highest baud rate for IrDA is 115.2 kbps for which the clock frequency equals 1.843 MHz (this terminal is tied to the BAUDOUT of a UART). 16XCLK 1 I GND 4 — IR_RXD 6 I Infrared receiver data. IR_RXD is an IrDA-SIR-modulated input from an optoelectronics transceiver whose input pulses should be 3/16 of the baud rate period. IR_TXD 7 O Infrared transmitter data. IR_TXD is an IrDA-SIR-modulated output to an optoelectronics transceiver. RESET 5 I Active high reset. RESET initializes an IrDA-SIR-decode/encode state machine (this terminal is tied to a UART reset line). U_RXD 3 O Receiver data. U_RXD is decoded (demodulated) data from IR_RXD according to the IrDA specification (this terminal is tied to SIN of a UART). U_TXD 2 I Transmitter data. U_TXD is encoded (modulated) data and output data as IR_TXD (this terminal is tied to SOUT from a UART). VCC 8 — Ground Supply voltage 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) MIN (2) MAX UNIT VCC Supply voltage –0.5 6 V VI Input voltage at any input –0.5 VCC + 0.5 V VO Output voltage –0.5 VCC + 0.5 V 0 °C TA Operating free-air temperature range Case temperature for 10 seconds Tstg (1) (2) TIR1000 TIR1000I –40 SO package Storage temperature –65 85 °C 260 °C 150 °C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage levels are with respect to GND. Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 3 TIR1000, TIR1000I SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 www.ti.com 6.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22C101 (2) ±900 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN NOM MAX 2.7 3 3.3 UNIT LOW VOLTAGE (3-V NOMINAL) VCC Supply voltage VIH High-level input voltage VIL Low-level input voltage 0.7 VCC V 0.2 VCC Operating free-air temperature TA V TIR1000 0 70 TIR1000I –40 85 V °C STANDARD VOLTAGE (5-V NOMINAL) VCC Supply voltage VIH High-level input voltage VIL Low-level input voltage TA Operating free-air temperature 4.5 5 5.5 0.7 VCC V V 0.2 VCC TIR1000 0 70 TIR1000I –40 85 V °C 6.4 Thermal Information TIR1000 THERMAL METRIC (1) PS (SO), PW (TSSOP) UNIT 8 PINS RθJA Junction-to-ambient thermal resistance 179.8 °C/W RθJC(top) Junction-to-case (top) thermal resistance 63.4 °C/W RθJB Junction-to-board thermal resistance 108.4 °C/W ψJT Junction-to-top characterization parameter 7.0 °C/W ψJB Junction-to-board characterization parameter 106.7 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. 6.5 Electrical Characteristics over operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN MAX UNIT VCC = 5 V VCC – 0.8 IOH = – 1.8 mA VCC = 3 V VCC – 0.55 IOL = +4 mA VCC = 5 V 0.5 IOL = +1.8 mA VCC = 3 V 0.5 ±3 µA 1 mA VOH High-level output voltage VOL Low-level output voltage II II Input current VI = 0 to VCC All other pins floating ICC Supply current VCC = 5.25 V All inputs at 0.2 V No load on outputs TA = 25°C 16XCLK at 2 MHz Ci(16XCLK) Clock input capacitance f(16XCLK) Clock frequency 4 TYP IOH = – 4 mA V 5 pF 2 Submit Documentation Feedback V MHz Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 TIR1000, TIR1000I www.ti.com SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 6.6 Switching Characteristics over operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP (1) MAX UNIT tr Output rise time No load 23.8 ns tf Output fall time No load 9.2 ns (1) Typical values are at TA = 25°C. 16 Cycles 16 Cycles 16XCLK IR_RXD U_RXD External Strobe 7 Cycles 16 Cycles Figure 1. Recommended Strobing For Decoded Data Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 5 TIR1000, TIR1000I SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 www.ti.com 7 Detailed Description 7.1 Overview TIR1000 serial infrared (SIR) encoder and decoder is a device (CMOS) that encodes and decodes bit data according with the IrDA specifications. For the correct performance of the TIR1000 device, an optoelectronics device and a UART device are necessary. The TIR1000 device operates as an interface between wireless infrared and UART communication. 7.2 Functional Block Diagram RESET IR_RXD Decoder U_RXD Encoder IR_TXD 16XCLK U_TXD 7.3 Feature Description The Infrared Data Association (IrDA) defines several protocols for sending and receiving serial infrared data, including the following rates: • 115.2 kbps • 0.576 Mbps • 1.152 Mbps • 4 Mbps The low rate of 115.2 kbps was specified first and the others must maintain downward compatibility with it. At the 115.2 kbps rate, the protocol implemented in the hardware is fairly simple. It primarily defines a serial infrared data word to be surrounded by a start bit equal to 0 and a stop bit equal to 1. Individual bits are encoded or decoded the same whether they are start, data, or stop bits. The TIR1000 and TIR1000I devices evaluate only single bits and follow only the 115.2-kbps protocol. The 115.2-kbps rate is a maximum rate. When both ends of the transfer are set up to a lower but matching speed, the protocol (with the TIR1000 and TIR1000I devices) still works. The clock used to code or sample the data is 16 times the baud rate, or 1.843 MHz maximum. To code a 1, no pulse is sent or received for 1-bit time period, or 16 clock cycles. To code a 0, one pulse is sent or received within a 1-bit time period, or 16 clock cycles. The pulse must be at least 1.6 μs wide and 3 clock cycles long at 1.843 MHz. At lower baud rates, the pulse can be 1.6 μs wide or as long as 3 clock cycles. The transmitter output, IR_TXD, is intended to drive an LED circuit to generate an infrared pulse. The LED circuits work on positive pulses. A terminal circuit is expected to create the receiver input, IR_RXD. Most (but not all) PIN circuits have inversion and generate negative pulses from the detected infrared light. Their output is normally high. The TIR1000 and TIR1000I devices can decode either negative or positive pulses on IR_RXD. 6 Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 TIR1000, TIR1000I www.ti.com SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 7.4 Device Functional Modes 7.4.1 IrDA Encoder Function Serial data from a UART is encoded to transmit data to the optoelectronics. While the serial data input to this block (U_TXD) is high, the output (IR_TXD) is always low, and the counter used to form a pulse on IR_TXD is continuously cleared. After U_TXD resets to 0, IR_TXD rises on the falling edge of the seventh 16XCLK. On the falling edge of the tenth 16XCLK pulse, IR_TXD falls, creating a 3-clock-wide pulse. While U_TXD stays low, a pulse is transmitted during the seventh to tenth clocks of each 16-clock bit cycle. 16 Cycles U_TXD 16 Cycles 16 Cycles 16 Cycles 16XCLK U_TXD 16XCLK 1 2 3 4 5 6 7 8 10 12 14 16 IR_TXD IR_TXD Figure 2. IrDA-SIR Encoding Scheme Detailed Timing Diagram Figure 3. Encoding Scheme Macro View 7.4.2 IrDA Decoder Function After reset, U_RXD is high and the 4-bit counter is cleared. When a falling edge is detected on IR_RXD, U_RXD falls on the next rising edge of 16XCLK with sufficient setup time. U_RXD stays low for 16 cycles (16XCLK) and then returns to high as required by the IrDA specification. As long as no pulses (falling edges) are detected on IR_RXD, U_RXD remains high. 16 Cycles IR_RXD 16 Cycles 16 Cycles 16 Cycles 16XCLK IR_RXD 16XCLK 1 2 3 4 5 6 7 8 10 12 14 16 U_RXD U_RXD Figure 4. IrDA-SIR Decoding Scheme Detailed Timing Diagram Figure 5. Decoding Scheme Macro View It is possible for jitter or slight frequency differences to cause the next falling edge on IR_RXD to be missed for one 16XCLK cycle. In that case, a 1-clock-wide pulse appears on U_RXD between consecutive zeroes. It is important for the UART to strobe U_RXD in the middle of the bit time to avoid latching this 1-clock-wide pulse. The TL16C550C UART already strobes incoming serial data at the proper time. Otherwise, note that data is required to be framed by a leading zero and a trailing one. The falling edge of that first zero on U_RXD synchronizes the read strobe. The strobe occurs on the eighth 16XCLK pulse after the U_RXD falling edge and once every 16 cycles thereafter until the stop bit occurs. Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 7 TIR1000, TIR1000I SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 www.ti.com IR_RXD 16XCLK 1 2 3 4 5 6 7 8 10 12 14 16 1 2 3 4 5 6 7 8 10 12 14 16 U_RXD Figure 6. Timing Causing 1-Clock-Wide Pulse Between Consecutive Ones The TIR1000 and TIR1000I can decode positive pulses on IR_RXD. The timing is different, but the variation is invisible to the UART. The decoder, which works from the falling edge, now recognizes a zero on the trailing edge of the pulse rather than on the leading edge. As long as the pulse width is fairly constant, as defined by the specification, the trailing edges should also be 16 clock cycles apart and data can readily be decoded. The zero appears on U_RXD after the pulse rather than at the start of it. IR_RXD 16XCLK 1 2 3 4 5 6 7 8 10 12 14 16 U_RXD Figure 7. Positive IR_RXD Pulse Decode Detailed View 16 Cycles 16 Cycles 16 Cycles 16 Cycles 16XCLK IR_RXD U_RXD Figure 8. Positive IR_RXD Pulse Decode Macro View 8 Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 TIR1000, TIR1000I www.ti.com SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 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. TL16C550C (UART) D7–D0 MEMR or I/OR MEMW or I/ON INTR RESET C P U A0 B u s A2 A1 TIR1000, TIR1000I Optoelectronics SOUT U_TXD IR_TXD To LED SIN U_RXD IR_RXD From TERMINAL RD1 RTS 16XCLK WR1 DTR INTRPT DSR MR DCD A0 CTS D7–D0 A1 TL16C550C (ACE) RI A2 XIN ADS WR2 1.843 MHz L CS H RD2 CS2 XOUT CS1 BAUDOUT CS0 RCLK Figure 9. Typical Application Schematic Submit Documentation Feedback Copyright © 1995–2015, Texas Instruments Incorporated Product Folder Links: TIR1000 9 TIR1000, TIR1000I SLLS228G – DECEMBER 1995 – REVISED AUGUST 2015 www.ti.com Typical Application (continued) 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. divisor = XIN frequency input / (desired baud rate × 16) (1) For example: divisor = 1.843 MHz / (115.2 kbps × 16) = 0.9999 (2) Error (divisor)