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| CY3242-IOXLITE I2C Port Expander Lite Demo Kit Guide Cypress Semiconductor 198 Champion Court San Jose, CA 95134-1709 Phone (USA): 880.858.1810 Phone (Intnl): 408.943.2600 http://www.cypress.com Copyright (c) 2007 Cypress Semiconductor Corporation. All rights reserved. PSoC(R) is a registered trademark and PSoC DesignerTM, Programmable System-on-ChipTM, and PSoC ExpressTM are trademarks of Cypress Semiconductor Corporation (Cypress), along with Cypress(R) and Cypress SemiconductorTM. All other trademarks or registered trademarks referenced herein are the property of their respective owners. Throughout this document I2C, IIC and I2C are used interchangeably to represent the I2C Communication Protocol trademarked by Philips. Purchase of I2C components from Cypress or one of its sublicensed Associated Companies conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. The information in this document is subject to change without notice and should not be construed as a commitment by Cypress. While reasonable precautions have been taken, Cypress assumes no responsibility for any errors that may appear in this document. No part of this document may be copied or reproduced in any form or by any means without the prior written consent of Cypress. Made in the U.S.A. Disclaimer CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress's product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. Flash Code Protection Cypress products meet the specifications contained in their particular Cypress PSoC Data Sheets. Cypress believes that its family of PSoC products is one of the most secure families of its kind on the market today, regardless of how they are used. There may be methods, unknown to Cypress, that can breach the code protection features. Any of these methods, to our knowledge, would be dishonest and possibly illegal. Neither Cypress nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable." Cypress is willing to work with the customer who is concerned about the integrity of their code. Code protection is constantly evolving. We at Cypress are committed to continuously improving the code protection features of our products. 2 I2C Port Expander Lite Demo Kit Guide Contents Using the I2C Port Expander Demonstration Kit ........................................................ 5 1. Board Specifications and Component Location .................................................. 5 1.1 Board Specifications ......................................................................................................5 1.2 Components Location....................................................................................................6 2. Jumper Settings and Connector Descriptions..................................................... 6 2.1 J1 Speaker Enable Jumper ...........................................................................................6 2.2 J2 - J9 Address Selection Jumpers ...............................................................................6 2.3 J10 Interrupt Selection Jumper......................................................................................6 2.4 J11 - External I2C Interface ...........................................................................................7 2.5 J12 USB Connector .......................................................................................................7 2.6 J13 I2C-USB Bridge ISSP Connector............................................................................7 2.7 J14 Power Source Selection Jumper.............................................................................7 2.8 J15 DC Adapter Plug Connector ...................................................................................7 2.9 SW2 I2C Bus Select Switch...........................................................................................7 3. I2C Port Expander Address Selection Jumpers................................................... 7 3.1 J2 - A3 Pin Mode ...........................................................................................................7 3.2 J3 - A3 High/Low Select ................................................................................................7 3.3 J4 - A2 Pin Mode ...........................................................................................................8 3.4 J5 - A2 High/Low Select ................................................................................................8 3.5 J6 - A1 Pin Mode ...........................................................................................................8 3.6 J7 - A1 High/Low Select ................................................................................................8 3.7 J8 - A0 High/Low Select ................................................................................................8 3.8 J9 - A0 Pin Mode ...........................................................................................................8 3.9 Setting the I2C Port Expander Address.........................................................................8 I2C Port Expander Lite Demo Kit Guide 3 4. I2C Port Expander Address Select Examples.......................................................9 4.1 I2C Port Expander Address Example 1 .........................................................................9 4.2 I2C Port Expander Address Example 2 .........................................................................9 4.3 I2C Port Expander Address Example 3. ......................................................................10 5. Demonstration Example Scripts ..........................................................................11 5.1 Script 1.........................................................................................................................11 5.2 Script 2.........................................................................................................................11 6. I2C Port Expander Board Schematics .................................................................12 4 I2C Port Expander Lite Demo Kit Guide Using the I2C Port Expander Demonstration Kit Associated Project: Yes Associated Part Family: CY8C9520A Software Version: PSoC DesignerTM V4.3 Associated Application Notes and Kits: AN2352, CY3242-IOX, and CY3240-I2USB 1. 1.1 Board Specifications and Component Location Board Specifications Feature Description 1 CY8C9520A I2C DC Adapter 7-14V 0.3A, 3.3V to 5V from External I2C, USB Cable 5V 5V 200 mA, 3.3V - 150 mA 5V 28 mA, 3.3V - 16 mA 3.5x3.5 inches (89x89 mm) Speaker, Eight DIP switch inputs, Integrated I2C-USB Bridge circuit or external I2C interface, 12 LED indicators, Reset switch, and Address selection jumpers. Number of Port Expander Devices Device Part Number Communication Interface Power Sources Maximum Power Consumption Device Power Consumption Board Size Additional Features I2C Port Expander Lite Demo Kit Guide 5 1.2 Components Location Switches Port Expander IC (CY8C9520) LED Indicators Speaker Enable Jumper I2C Bus Source Select Switch Address Selection Jumpers Reset External I2C Interface I2C_USB Bridge I2C Interrupt Source Jumper External Power Supply Power Source Select Jumper 2. 2.1 Jumper Settings and Connector Descriptions J1 Speaker Enable Jumper Open - Speaker is disconnected from the I/O Expander pin. Closed - Expander pin GP2_2 is connected to the speaker driver circuit. 2.2 J2 - J9 Address Selection Jumpers See description below for details about port expander address selection. 2.3 J10 Interrupt Selection Jumper Open - U1 interrupt pin is disconnected from I2C interrupt line. Closed 1, 2 - U1 interrupt pin is connected to the External I2C interrupt line. Closed 2, 3 - U1 interrupt pin is connected to the I2C-USB Bridge interrupt line. 6 I2C Port Expander Lite Demo Kit Guide 2.4 1 VCC J11 - External I2C Interface 2 GND 3 Interrupt 4 Clock 5 Data 2.5 J12 USB Connector Connects the I2C-USB Bridge circuit to the USB port for configuration and data collection. 2.6 J13 I2C-USB Bridge ISSP Connector Used for reprogramming the I2C-USB Bridge circuit's firmware. 2.7 J14 Power Source Selection Jumper Closed 2, 3 - Board is powered from the USB cable (default). Closed 1, 2 - Board is powered from external DC power supply using the internal regulator. 2.8 J15 DC Adapter Plug Connector + DC 7-14 0.3A - 2.9 SW2 I2C Bus Select Switch Connects the I/O Expander's I2C bus to either the I2C-USB Bridge circuit, or to the External I2C Connector (J11). 3. I2C Port Expander Address Selection Jumpers The I2C Port Expander board allows the user to select the address used for the expander device. You must configure every device on the same I2C bus to an individual I2C address. For I2C address configuration, use the address selection jumpers J2 - J9. Each address line has two jumpers associated with it, a Mode jumper and a High/Low jumper. The Mode jumper allows the pin to be connected to a LED for the I/O function (position I), as a Strong address pin (S), or as a Weak address pin (W). The High/Low jumper has no effect if the Mode jumper is in the I/O position. If the Mode jumper is in one of the address positions, the High/Low jumper determines if the address pin is pulled High (H) or Low (L). Only the first four address pins, A0 through A3, are available for use as addresses on this demonstration board. 3.1 J2 - A3 Pin Mode 1-2 (I): I/O mode (default) 2-3 (S): Strong Address 3.2 J3 - A3 High/Low Select 1-2 (H): Pull up (default) 2-3 (L): Pull down I2C Port Expander Lite Demo Kit Guide 7 3.3 J4 - A2 Pin Mode 1-2 (I): I/O mode (default) 2-3 (S): Strong Address 3-4 (W): Weak Address 3.4 J5 - A2 High/Low Select 1-2 (H): Pull up (default) 2-3 (L): Pull down 3.5 J6 - A1 Pin Mode 1-2 (I): I/O mode (default) 2-3 (S): Strong Address 3-4 (W): Weak Address 3.6 J7 - A1 High/Low Select 1-2 (H): Pull up (default) 2-3 (L): Pull down 3.7 J8 - A0 High/Low Select 1-2 (H): Pull up (default) 2-3 (L): Pull down 3.8 J9 - A0 Pin Mode 1-2 (S): Strong Address (default) 2-3 (W): Weak Address 3.9 Setting the I2C Port Expander Address Use the A0 line to define the corresponding bit of the I2C address. Pull this pin up or down. If A0 is a strong pull up or a strong pull down (connected through 330 ohms or less, to Vdd or Vss), then that is the only address line specified and the A1-A6 lines are used as GPIO. If A0 is a weak pull up or a weak pull down (connected to Vdd or Vss through 75 - 200-kohm resistor), then A0 is not the only externally defined address bit. There is a pin assigned to be A1 if it is needed. Pull this pin up or down, strong or weak with a resistor if it is going to be used for address selection. As with A0, the type of pull determines whether the address bit is the last externally defined address bit. Different from A0, A1 is not dedicated as an address pin. It is only used if A0 is not the only address bit externally defined. There are also predefined pins for A2, A3, A4, A5 and A6 that are only used for addressing if they are needed. The last address bit in the chain is pulled strong. That way, only the number of pins needed to assign the address desired for the part are allocated as address pins; and any pins not used for address bits are available for use as GPIO pins. The table, "Device Addressing," on page 3 of the I2C Port Expander Data Sheet defines the resulting device I2C address. 8 I2C Port Expander Lite Demo Kit Guide 4. 4.1 I2C Port Expander Address Select Examples I2C Port Expander Address Example 1 To set the I2C address to 0x40 (0100000), set A0 to Strong Pull Down using jumpers J8 and J9. The other address pins are made available for use as GPIO by placing J2, J4 and J6 to the I (I/O) position. The resulting I2C address is: A6 7 0 N/A A5 6 1 N/A A4 5 0 N/A A3 4 0 J2 = I A2 3 0 J4 = I A1 2 0 J6 = I A0 1 0 J9 = S J8 = L N/A a 0 0 N/A Expander Address Pins I2C Address Bits Bit Value Jumper Setting I2C address is set to 0x42. 4.2 I2C Port Expander Address Example 2 To set the I2C address to 0x46 (0100110), set A0 to Weak Pull Down, A1 to Weak Pull Up, and A2 to Weak Pull Down. A3 is still available for use as GPIO. The resulting I2C address is: A6 7 0 N/A A5 6 1 N/A A4 5 0 N/A A3 4 0 J2 = I A2 3 0 J4 = S J5 = H A1 2 0 J6 = W J7 = H A0 1 0 J9 = W J8 = L N/A 0 0 N/A Expander Address Pins I2C Address Bits Bit Value Jumper Setting a This position represents the R/W bit. I2C Port Expander Lite Demo Kit Guide 9 I2C address is set to 0x46. 4.3 I2C Port Expander Address Example 3. To set the I2C address to 0x56 (0101110), set A0 to Weak Pull Down, A1 to Weak Pull Up, A2 to Weak Pull Down, and A3 to Strong Pull Up. The resulting I2C address is: A6 7 0 N/A A5 6 1 N/A A4 5 0 N/A A3 4 0 J2 = S J3 = H A2 3 0 J4 = W J5 = L A1 2 0 J6 = W J7 = H A0 1 0 J9 = W J8 = H N/A 0 0 N/A Expander Address Pins I2C Address Bits Bit Value Jumper Setting I C address is set to 0x56. 2 10 I2C Port Expander Lite Demo Kit Guide 5. 5.1 Demonstration Example Scripts Script 1 1 kHz tone to speaker. Address is 0x42. Install Jumper J1. s42 28 03 04 25 10 3 ;select and configuring PWM s42 0A FF ;select output port register s42 18 02 ;select the Gport to be configured s42 1c 00 ;configure port as output s42 1a FF ;allow port to PWM output s42 21 FF ;select strong drive 5.2 Script 2 Read switches states. Address is 0x42. ;Set up Port 0 to read switches s42 08 00 ;Write to port 0 zeros s42 18 00 ;select the Gport to be configured s42 1c ff ;Set the port direction to input s42 1e ff ;select Resistive pull Down drive s42 00 ;start reading s43 x ;repeat this line for continuously reading button state See the I2C Port Expander Data Sheet for more configuration details. I2C Port Expander Lite Demo Kit Guide 11 6. I2C Port Expander Board Schematics 12 I2C Port Expander Lite Demo Kit Guide I2C Port Expander Lite Demo Kit Guide 13 |
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