User manual for eight bit port expander STMPE801 demonstration
Contents
1. Figure 10 Screen shot of STMPE801 GUI startup screen ce 9 Figure 11 Screen shot of write read tab in STMPE801 GUl 00 a 10 Figure 12 Error screen when the incorrect I C slave address is chosen 10 Figure 13 GPIO Input state screen shot eee eens 11 Figure 14 GPIO Output state screen Shot 0 0 eee ee eee 12 Figure 15 Entering in hibernate mode a 13 Figure 16 Interrupt setting tab screen Shot 0 ce ee eens 13 Figure 17 Interrupt enabled with indication of current interrupt status in the ISR screen shot 14 Figure 18 External IC connector 15 Figure 19 Demo board footprint 0 0 aa 16 lt 3 17 Getting started UM0401 1 1 1 2 1 3 4 17 Getting started System requirements In order to use the port expander demonstration board with the Windows operating system a recent version of Windows such as Windows XP or Windows 2000 must be installed on the PC The user must have administrative rights to install the executable and launch it The version of the Windows OS installed on your PC may be determined by clicking on the System icon in the Control Panel Package contents The port expander demo board includes the following items Hardware content One demonstration board One parallel port cable Software content PC executable software STMPE801 GUI to be used along with demo board A D2. Running the STMPE801 port expander GUI Programming GPIO The eight GPIOs can be configured as input or output individually and independently of each other The status of the GPIOs can be read and are displayed on the GPIO functional tab of the GUI as shown in Figure 13 As shown in Figure 14 GPIOs can be configured as outputs by selecting the corresponding radio button for IN or OUT assignment and clicking the GPIO Assignment button The output state can be set to High or Low through the corresponding radio button and clicking on the Write button The resulting state of the GPIOs can be read and displayed by clicking on the Read button Like the Read Write to internal registers the correct slave device should be chosen before the GPIO is configured If the wrong slave device is chosen errors appear indicating there is an error reading the GPMR or writing to GPDR registers depending on the function performed Figure 13 GPIO Input state screen shot SIMPEB01 DEMO GP1O functional Interrupt Setting Fower Mode write Read Device SPIO Pin Assignment Writing ko Gutput Reading Input skate IN OUT MB a a a m m p 11 17 Running the STMPE801 port expander GUI Figure 14 GPIO Output state screen shot STMPEB01 DEMO GPI0 functional Interrupt Setting Power Mode write Read Device SPIO Pin Assignment Writing to Qukpuk c 4 fe 2 Lo HI fj TI san PER Assignment 2 3 Power modes There are
3. 2 functions that can be tested using this tab as shown in Figure 15 I2C shutdown eSoft reset Reading Input stake UM0401 The STMPE801 slave devices can be put in Power down mode by clicking on the I C Shutdown button This shuts down the device and displays a message to press the reset button to resume normal device operation Clicking the Soft Reset button performs the reset of the device Like the other function tabs the correct slave device should be chosen before clicking the buttons 12 17 lt UM0401 Figure 15 Entering in hibernate mode C gt STMPEBO1_DEMO Device ID e1 ff 2 Tac Shutdown SoftReset 2 4 Configuring interrupts Running the STMPE801 port expander GUI The GUI provides a convenient way to configure the GPIO interrupts in STMPE801 and monitor the change of state in the GPIOs that trigger interrupts if so configured Figure 16 shows a screen shot of the Interrupt tab before the interrupts are configured and running It allows configuring the interrupt polarity and the masking of each individual GPIO Figure 16 STMPEB01 DEMO Device e112 Enable Polarity C on e Active Low off Active High GPIO Enable Mask i ite a igs gx of WE W Reset Interupt Read GPIO Interrupt Status 0 1 2 3 4 5 6 7 START STOP CLEAR me lt Interrupt Interrupt setting tab screen shot DER 13 17 Running the STMPE801 port expander GUI UM0401 The approp
4. 3 VCC Bj vio Vei The board is ready to function after these jumper settings and the GPIOs can be accessed through the different headers provided Refer to Section 4 for the location of the various jumpers on the board Running the STMPE801 port expander GUI This port expander demo board consists of two main parts e PC GUI Demonstration board The various jumpers on the board should be configured correctly before running the GUI In order to run the GUI the demo board must first be connected to the PC with the DB 25 parallel port cable and the power supply of 5 V should be provided The user should login as administrator before running the GUI STMPE801_DEMO exe This file should be run from the same directory as the io dll file When the GUI is successfully running the startup screen resembles Figure 10 There are four tab options for testing the various device functionalities as explained in the following sections SZA UM0401 2 1 lt Running the STMPE801 port expander GUI Figure 10 Screen shot of STMPE801 GUI startup screen STMPE801_DEMO Bf gt Device Address oo pi Address Length fog ka Length 00 00 oo J m oT CJ MI e O co OI o O o a o 1 2 3 4 5 6 7 5 Running internal registers of STMPE801 The internal registers of the STMPE801 can be read or written to using the Write Read tab in the GUI Figure 11 shows a screen shot of this function The radio butt
5. To control the STMPE801 devices using the external I C master The jumper settings on JP55 2 and JP56_2 should be removed Refer to Figure 4 The SCLK of the master should be connected to pin 2 of JP17_2 and the SDAT of master should be connected to pin 4 of JP17_2 Pins 2 and 4 already have pull up resistors connected to pull up the open drain SCLK and SDAT pins If these resistors are not required the resistors R4_2 and R5_2 should be removed from the demo board In this mode the PC GUI is not be available for the external 12C master 15 17 Demo board footprint UM0401 4 Demo board footprint Figure 19 Demo board footprint 100 10 7 10 1 105 102 105 10 3 104 SERGE JP12 JPB 2 JP2 2 JP7 2 wes JP6 2 JP4 r a o i m m m m R9_2 m mm m mm m m m m R8_2 R15 2 R22_2 R12_2 RI6 2 R21 2 4 M3 2 CECE RIO 2 Ri 2 m m m m JP10_2 JP11 2 7 GPIO 0 GPIO1 GPIO 2 GPIO 3 TTT ULTI m m m m c ho De Cr JP56 B JP55 2 1 P172 External I2C 4 2 connector 13 PARALLEL PORT CONNECTOR 5 Revision history Table 1 Revision history 05 Jun 2007 First issue lt 16 17 UM0401 Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services descri
6. pull up resistor and LED for easier monitoring of the generated interrupts If this is not connected an external pull up resistor should be used to pull up the open drain INT output to VIO supply The jumper should connect pins 1 and 2 Figure 6 JP2_3 setting for STMPE801 INT pull up e JP3 3 and JP5 3 JP3 3 is used to connect the I2C_CLK from the I C Master to the STMPE801 SCLK pin And similarly JP5_3 is used to connect I C DATA from the 1 C Master to the STMPE801 SDATA pin Figure 7 shows the jumper connection to be used on the board Figure 7 JP3 3 and JP5_3 setting for STMPE801 SCLK and SDAT IPs a JP3 1 1 SCLE SDATA 7 17 Running the STMPE801 port expander GUI UM0401 8 17 JP4 3 JP4 3 is the jumper used to select the I2C slave address as either 0x82 or 0x88 There are pull down and pull up resistors for the respective selection and these can be enabled by shorting the headers as shown in Figure 8 Figure 8 JP4 3 setting for STMPE801 IZC Slave address selection IPS JP4 3 Ae mj e ADDR ADDR 0x82 0x88 JP6 3 and JP7 3 These jumpers are provided to isolate the STMPE801 chip from the rest of the board for troubleshooting They can also be used as test points to measure the respective supply operating current To supply the chip with the Vcc and VIO these jumpers should be shorted as shown in Figure 9 Figure 9 JP6 3 and JP7 3 setting for STMPE801 Vee and VIO connections 3 JP6 3 JP7
7. LL file to support the executable io dll to be installed in the same directory as the executable file Source code written in Borland Delphi Documentation User manual Schematic of the hardware Software installation The GUI is a simple executable that can be run even from a USB flash drive The only requirement is that the user must have administrative rights on the system in order to open the accompanying DLL file The GUI can be started by double clicking on the file STMPE801_GUl exe When the exe file is opened the GUI resembles Figure 7 below lt UM0401 Getting started Figure 1 GUI start up screen 2 STMPEB01 DEMO E Bz N Device GPIO Pin Assignment Writing to Output Reading Input state e1 LO HI a IN OUT Ole a ce C GPIO i Assignment O os l 2 e C ic Write 3 a xi Read 1 4 Hardware installation Figure 2 below shows the snapshot of the demonstration board Figure 2 Port expander board a 5 17 Getting started UM0401 1 4 1 1 4 2 6 17 Power supply The demo board should be powered from an external supply of 5 V 1 A Connector X1 is for 5 V and Connector X2 is GND This supply is regulated to get the required Vcc Vio and Voull up Voltages by adjusting the Resistor divider components Figure 3 below shows the Voltage regulation circuit used For example a Vcc of 1 8 V can be achieved b
8. TIONS NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ST PRODUCTS WHICH ARE NOT SPECIFIED AS AUTOMOTIVE GRADE MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK Resale of ST products with provisions different from the statements and or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever any liability of ST ST and the ST logo are trademarks or registered trademarks of ST in various countries Information in this document supersedes and replaces all information previously supplied The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners 2007 STMicroelectronics All rights reserved STMicroelectronics group of companies Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom United States of America www st com lt 17 17
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10. cri UM0401 YI User manual June 2007 User manual for eight bit port expander STMPE801 demonstration board Introduction This document explains the functioning of the demo board for the port expander Chip STMPE801 with a PC GUI for reading and writing to the eight GPIOs and controlling the 1 C interface The objective of this demonstration board is to display the capabilities of the 8 bit port expander STMPE801 developed by STMicroelectronics using a Windows based software application The software application provides a user friendly environment to test the port expander and verify its functionality The board is controlled by the GUI through the parallel port in the PC The power to the board should come from an external 5 V constant DC power supply The PC based GUI acts as the I C host and controls the STMPE801 slave on the board The eight GPIOs in the STMPE801 are accessible through headers and can be easily pulled high or low using jumpers The GPIOs can be configured as outputs by writing to the appropriate registers using the GUI All these interfaces are controlled by using I C communication between Host and Slave devices In addition the hardware has a provision for controlling the STMPE801 through an external I C master Rev 1 1 17 www st com Contents UM0401 Contents 1 Ce SIINO AA AA AA be tneces 4 1 1 System requirements eee eas 4 1 2 Package contents cece aa 4 1 3 Software installa
11. on device 1 should be selected if the slave address is 0x82 and radio button device 2 should be selected if the slave address is 0x88 Making the wrong selection on the device radio buttons generates an error message as shown in Figure 12 9 17 Running the STMPE801 port expander GUI UM0401 Figure 11 Screen shot of write read tab in STMPE801 GUI STMPEBO1 DEMO efx GPI0 Functional Interrupt Setting Power Mode Write Read Address oo maa Address Length ix 2 Length pub 1 2 3 4 5 6 7 5 co Mm cn KB DI pe a O a O O co O mm The register contents can be read by writing the 8 bit hex address into the Address field and the number of registers to be read in the Length field Then click on the Read button The contents displayed are in Hex and 8 bits wide The same procedure can be followed for writing into the registers The content to be written should be in bytes and only 8 bytes can be written with a single Write button click Note The Length field should always be non zero A read or write with length zero causes the GUI to close Figure 12 Error screen when the incorrect I2C slave address is chosen C STMPE801_DEMO GP10 functional Interrupt Setting Power Mode Write Read Address oo a Address Length loo 2 Length s o sy o A Fe N me co mg oO mn H CJ MN o o o o o o o Read WET Reading Error num 0x00000002 lt 10 17 UM0401 2 2 lt
12. riate slave device should be chosen before enabling the interrupt The Interrupt settings are configured into the internal configuration registers as soon as the SET button is clicked The Interrupt window turns green to indicate that the interrupt is enabled In order to turn off all interrupt settings click on the Reset Interrupt button This is shown in Figure 17 The ISR can be monitored using the Read GPIO Interrupt Status panel Once the START button is clicked the ISR is read at 100ms intervals and the results are displayed with corresponding green squares for GPIOS with state change This monitoring can be stopped by clicking on the STOP button All GPIOS are reset to default state by the CLEAR PANEL button The clear panel does not work when the monitoring is running Figure 17 Interrupt enabled with indication of current interrupt status in the ISR screen shot STMPEBO1 DEMO GPI0 functional Interrupt Setting Power Mode Write Read Enable Polarity Device on Active Low f if 2 C off Active High GPIO Enable Mask wio Mi M2 M3 w4 VS W6 W7 Reset Interupt Read GPIO Interrupt Status 0 S 1 2 3 4 a 5 6 7 STOP CLEAR mn a 14 17 UM0401 3 lt Using the external I2C master Using the external I2C master We can also use an external I C Master to control the STMPE801 by using the pins available on the JP17 2 connector as shown in Figure 18 Figure 18 External I C connector
13. tion aa 4 1 4 Hardware installation ee eee eee 5 1 4 1 POWELSUPDN souesnocducegdeemt otoodbecusdeueeeeuauseedane 6 1 4 2 JUMPER SOIMAOS maa crus ha maaa ahm ANA Puneet aeudeee hh eapesu cs 6 2 Running the STMPE801 port expander GUI 8 2 1 Running internal registers of STMPE801 0 000 ee eee 9 2 2 Programming GPIO 2 eee ee ees 11 2 3 POMELMOOES aaa ka DE AWAN LAMANG AM ee ee de BRAD AKDA KG 12 2 4 Configuring interrupts eee ee 13 3 Using the external I C master 00 ce ec cee ec maana 15 4 Demo board footprint 0 00 es 16 5 Revision history mi te cm werd eh aw ww ie eevee eee we we nw eae 16 2 17 SZA UM0401 List of figures List of figures Figure Tt GUILsStan UP SCREEN Zakk PA KEAN chee KL NAAN AKA NA APA TEPBRLEBAG a L E 5 Figure 2 Port expander board 0 eee eee teen eens 5 Figure 3 Voltage regulation from 5 V supply VIN 0 00 cee ee eee 6 Figure 4 JP10_1 for Power supply ccc eee 6 Figure 5 JP55 2 and JP56 2 for I C CLK and I C_SDATA selection aa 7 Figure 6 JP2 3 setting for STMPE801 INT pull up 0 0 0 0c ee 7 Figure 7 JP3 3 and JP5 3 setting for STMPE801 SCLK and SDAT aaa 7 Figure 8 JP4 3 setting for STMPE801 I C Slave address selection 8 Figure 9 JP6 3 and JP7 3 setting for STMPE801 Vee and VIO connections 8
14. y fixing the R6_1 resistor to 680 ohms and calculating R7_1 using the formula Equation 1 14 R5 Vout Vaer TE laps R73 where the Voyt we need is 1 8 V Vpep is 1 25 V and lapy is 50 pA By default the resistors are chosen to fix the voltages at Vcc 1 8 V Vig 3 3 V and Voull up 2 3 V in the demo board Figure 3 Voltage regulation from 5 V supply Vin VIN VOUT mi T Jumper settings There are several jumpers on the board that should be properly set to ensure proper functioning of the board JP10_1 as shown in Figure 4 below the JP10 1 jumper should be set to power the voltage Regulators with 5V from the X1 and X2 connectors This is the main power connection for all the components on the board Figure 4 JP10 1 for Power supply JPL1O_1 0 0 m Power supply a UM0401 lt Getting started JP55 2 and JP56 2 as shown in Figure 5 below these jumper settings are to select the 12 C CLOCK and DATA source either from the parallel port DB 25 connector or from an external I C Master Figure 5 JP55 2 and JP56 2 for I C CLK and I C SDATA selection ae IP56_ JPS5 7 I C DATA I C CLK These jumpers should be connected if STMPE801 is to be controlled by the GUI through the DB 25 connector They can be left open if an external C Master is used For using external I C Master refer to Section 3 JP2_3 as shown in Figure 6 below JP2_3 is used to connect the INT pin to the
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