ACTiSYS IR8250P Specification

Irda compliant protocol processor

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48511 Warm Springs Blvd., Suite 206, Fremont, CA 94539

Tel: (510) 490-8024

Fax: (510) 623-7268

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http://www.actisys.com

E-mail:

irda-info@actisys.com

ACT-IR8250P

IrDA Compliant Protocol Processor

Specification

January 28, 2005 Rev. 0.44

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Page 1 48511 Warm Springs Blvd., Suite 206, Fremont, CA 94539 Tel: (510) 490-8024 Fax: (510) 623-7268 Website: http://www.actisys.com E-mail: irda-info@actisys.com ACT-IR8250P IrDA Compliant Protocol Processor Specification © Copyright 2003-2005 ACTiSYS Corporation All Rights Reserved January 28, 2005 Rev. 0.44...
Page 2: Revision History
Rev. 0.43 11/22/2004 Add connector of DB dimension on page 16. Rev. 0.44 01/28/2005 Add IR8250PEK-J1 connector detail on pages 16~19 & 21 © Copyright 2003-2005 ACTiSYS Corp. Revision History Comment implementation examples. Added Eval. Kit PCB dimensions and circuit schematics.
Page 3: Table Of Contents
4. Device Operation... 8 5. IrDA Protocols Supported ... 10 6. IR8250P Parts ID and Firmware Number System... 11 7. Connect ACT-IR8250P to a Host Device with RS232 Port ... 12 8. Implementation Notice ... 13 9. In-System Programming in ACT-IR8250P... 14 10.
Page 4: Features
Windows IrDA driver. To avoid debugging multiple issues: e.g. PDA application IrDA SW activated and behaves properly, with the matching protocol layer? IR8250P to host interface issues (UART data rates, flow control, data bit/parity/stop bit, UART signal pins, power levels)? Performance issues (throughput, distance, error rate/dropping bits)? ©...
Page 6: Overview
PC, PDA, cellular phone and hand held data terminal, via IrDA beam and protocol but has only a wired serial interface. The ACT-IR8250P will handle all the detail about IrDA protocol. It sends/receives only user data to/from the host device via the wired serial interface with hardware flow-control.
Page 7: Pin Description
IrDA status to Host. High=No IrDA connection. Low=IrDA connection active. RX flow control to Host. High=IR8250P not ready to accept RX, Low=IR8250P ready to Received data from transceiver. (n: Active low ) High=No IR, Low=IR detected. Page 6 of 25...
Page 8 PIN Description (Continued) Symbol Type P1.3 P1.4 P1.5 P1.6 P1.7 © Copyright 2003-2005 ACTiSYS Corp. Descriptions Reserved. Keep it open. Reserved. Keep it open. Reserved. Keep it open. Reserved. Keep it open. Reserved. Keep it open. Page 7 of 25...
Page 9: Device Operation
4.3 Host Interface The host interface of IR8250P is a full-duplex asynchronous serial data interface. The data bytes are transmitted via TX and received via RX. Each data byte consists of one start bit (0), 8 data bits (LSB first, MSB last) and a stop bit (1).
Page 10 Specification 4.4 IR port interface The IR port of IR8250P can be connected to most transceiver. The data is transmit by pin IR_TX and data received by nIR_RX. IR_SD can shut down transceiver when IR8250P is disabled. This pin is optional.
Page 11: Irda Protocols Supported
In this sleep state, it can be awaken only by nEnable going low. When nEnable is low, ACT IR8250P drives IR_SD low (to power up the IR transceiver) and puts itself to sleep. In this sleep state, it can be awaken by any incoming IR signal. Once awaken, it will either actively communicate with an IrDA Primary device (PC, PDA, Cell phone, etc.), or go back to sleep if...
Page 12: Ir8250P Parts Id And Firmware Number System
ACT-IR8250P The Infrared Wireless Expert Specification 6. IR8250P Parts ID and Firmware Number System ACT-IR8250P-#### (Please contact irda-info@actisys.com or info@actisys.com.tw for updated firmware and parts #) Jan 28, 2005 © Copyright 2003-2005 ACTiSYS Corp. Page 11 of 25 Rev. 0.44...
Page 13: Connect Act-Ir8250P To A Host Device With Rs232 Port
Note: A RS232 level converter chip is needed when IR8250P is connected to a RS232 interface. There are a total of 7 signals between the host and the IR8250P. The pin assignment and name of each signal at the chip levels are summarized in Table 1 below. Please note that DTE denotes signals on the RS232 board or device.
Page 14: Implementation Notice
IR_SD Please see the transceiver’s specification to get more detail information about transceiver. Place IR8250P chip next to transceiver module as close as possible. And keep chip away from high power consumption components. © Copyright 2003-2005 ACTiSYS Corp. Comments...
Page 15: In-System Programming In Act-Ir8250P
(2) Stop_Rx (output) at Pin-22 (P1.1) of IR8250P must be converted to RS232 Level and connected to the CTS input of PC COM Port. (3) Tx (output) at Pin-15 (P3.4) of IR8250P must be converted to RS232 Level and connected to the RxD input of PC COM Port.
Page 16: Act-Ir8250P Evaluation Kit (Ir8250Pek And Ir8250Pekk)
Performance issues (throughput, distance, error rate/dropping bits)? The following figure is IR8250P evaluation kit, IR8250PEK. It consists of two boards, IR82x0PMB on the left, and IR8250PDB on the right, connected to each other by 10 pin connector/cable. You can connect this evaluation kit to your host RS232 port, or use IR8250PDB board to connect to your host CMOS level UART signals.
Page 17 PCB footprint & dimensions, part number, supplier and pinout spec for the connector J1 on IR8250x0PMB and IR8250PDB boards are as follows: Molex, part number SD-48148, you can get dimensional information at: www.molex.com. More details on page 17. © Copyright 2003-2005 ACTiSYS Corp. Page 16 of 25 ACT-IR8250P...
Page 19 PCB footprint & dimensions, part number, supplier and pinout spec for the connector J1 on IR8250x0PMB and IR8250PDB boards are as follows: Molex, part number SD-48148, you can get dimensional information at: www.molex.com. More details on page 17. © Copyright 2003-2005 ACTiSYS Corp. +3.3V 0.47uF...
Page 20 10 pin connector as in this ACT-IR8250PDB reference circuit here. This enables in-system IR8250P firmware re-programming with new firmware if such need arises. This flexibility can extend your product lifetime, improve compatibility with new IrDA devices, add or change IrDA functionality, indeed a valuable and useful feature.
Page 21: Characteristics And Specification
Schmitt-trigger inputs Port P1 to Port P3; P1.0 to P1.7, P2.0 to P2.5, P3.0 to P3.7 PARAMETER VIT+ Positive going input threshold voltage VIT- Negative going input threshold voltage Vhys Input voltage hysteresis (VIT+ VIT- ) © Copyright 2003-2005 ACTiSYS Corp. ) ……………………………………………–0.3 V to V MIN. TEST CONDITIONS VCC = 2.2V VCC = 3.0V...
Page 22: Application Circuit
Low = start-bit / 0-bit High = idle / stop-bit / 1-bit Serial data from host Low = start-bit / 0-bit High = IR8250P not ready to accept RX STOP_RX RX Flow-control to host Low = IR8250P ready to accept RX...
Page 25: Appendix 1. How To Use Act-Ir8250Pek (Act-Ir8250P Evaluation Kit)
The Infrared Wireless Expert Appendix 1. How To Use ACT-IR8250PEK (ACT-IR8250P Evaluation Kit): The following steps instruct you how to use ACT-IR8250PEK: The ACT-IR8250PEK Package: Includes the following: IR82x0PMB: IR82x0P IC series to RS232 interface motherboard. IR8250PDB: IR8250P CMOS 3.3V interface daughter board.
Page 26 LED D3: When it flashes, means IR8250P is receiving data from another IrDA device and sends these data to host device. LED D5: When it lights up, means IR8250P enables its CTS. D5 lights off means IR8250P is not allowed to receive any data from host device (e.g. buffer full, etc.).

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