ST STMPE2401 User manual

March 2007 Rev 2 1/22
UM0300
User manual
Port expander STMPE2401 demonstration board
Introduction
This Document explains the functioning of the port expander demo board consists of the
port expander IC STMPE2401 and controller ST72F63B microcontroller as I2C master
along with a PC GUI.
The objective of this demonstration board is to display to the user the features and
capabilities of the port expander chip (STMPE2401) using a Windows-based host software
application and one of several USB low-speed microcontrollers (ST72F63B) from ST acting
as a control device.
The host software and the ST7 source code provide a user friendly environment to use
demo board in following modes:
●Standalone mode
●PC GUI mode
In both modes, power to board can be provided from either USB bus itself or from external
power.
In this demo board, the ST72F63B Microcontroller acts as the I2C master and controls two
STMPE2401 devices functioning as I2C Slaves. The STMPE2401 devices are used to
interface LCD, normal keypad, rotator controller, dedicated keys and 6 PWM outputs. All
these interfaces are controlled by just using I2C communication between master and slave
devices.
all events like dedicated key press (four direction keys); keypad key press (4 x 4 keypad),
Rotator direction, power mode etc. are captured and displayed in LCD screen and in the
scan window of PC GUI. For visual display of the PWM output LEDs are provided on the
board. The capability of rotator controller has been demonstrated by mechanically
implementing the rotator configuration using switches.
For interfacing with the PC GUI, the application layer is built above the USB core library that
makes all the hardware control of the USB interface transparent for the developers.
The PC GUI supports various power saving modes of port expander and wake up feature to
get back to default operational mode.
In addition the board has the provision for an alternate I2C path for external control.
Also the board has ICC connector to re-program the ST7 Microcontroller flash memory.
www.st.com

Contents UM0300
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Contents
1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4.2 Jumper settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Running the STMPE2401 port expander demo board . . . . . . . . . . . . . . 9
2.1 Running in standalone mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.1 PWM Output demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.2 Keypad demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.3 Dedicated keypad demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.4 Rotator demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Running in PC GUI mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.1 Read/Scan mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.2 Write/program mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.3 Reading internal memory of STMPE2401: . . . . . . . . . . . . . . . . . . . . . . 15
2.2.4 Programming PWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2.5 Power down mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3 Using the external I2C master: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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List of figures
Figure 1. Installation window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2. License window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Destination folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 4. Installation ongoing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 5. Installation complete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 6. Port expander demo board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 7. JP1 and JP2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 8. JP3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 9. JP4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 10. Embedded 4x4 keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11. Dedicated keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 12. Rotator interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 13. Enumeration result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 14. STMPE2401 PC GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 15. Message for board not connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 16. Message for board connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 17. Read/Scan mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 18. Events in scan window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 19. Write/program mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 20. Reading internal memory of STMPE2401 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 21. Programming STMPE2401 PWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 22. Entering in hibernate mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 23. Wake-up from hibernate mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 24. External I2C connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Getting started UM0300
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1 Getting started
1.1 System requirements
In order to use the port expander demonstration board with the Windows operating system,
a recent version of Windows, such as Windows 2000 or Windows XP must be installed on
the PC.
The version of the Windows OS installed on your PC may be determined by clicking on the
"System" icon in the control panel.
1.2 Package contents
The port expander demo board includes the following items:
●Hardware content:
– One demonstration board.
●Software content:
– PC executable software (PE_2401_GUI) to be used along with demo board
●Documentation:
–Usermanual
1.3 Software installation
To install the PC GUI software, follow the step as mentioned below:
●Step1: As soon as the user clicks the portexpander.exe Icon, the following window
appears.
Figure 1. Installation window

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●Step 2: Read the license file and click the "Yes" button if you accept the license.
Figure 2. License window
●Step 3: Please select the folder in which, you want to install the software. By default it
will install the software in the following path- C:\Program
Files\STMicroelectronics\PortExpanderSTMPE2401
Figure 3. Destination folder

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●Step 4: After you select the folder and click the next button, it will start installing the
software.
Figure 4. Installation ongoing
●Step 5:
Figure 5. Installation complete
After you click the "Finish Button", you will find that the software is installed in the directory
you selected or in the default directory. Also you will find the shortcut of this software also
available in you START menu. This user manual is also available in the same directory.

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1.4 Hardware installation
Figure 6 below shows the snapshot of the demonstration board.
Figure 6. Port expander demo board
1.4.1 Power supply
The demo board can directly be powered by the USB Connector (Bus powered).
Or you can use an external power supply. The external power supply should be getting
minimum supply of 7 V, 1 A and maximum power supply of 12 V, 1 A.
1.4.2 Jumper settings
There are four jumpers (JP1, JP2, JP3, and JP4) are available on the board. The correct
connections of these connectors are necessary for the proper functioning of the demo
board.
●JP1 and JP2: JP1 and JP2 are the connectors which are used to select between the
I2C lines and ICC lines (for programming the ST7 microcontroller) as shown in the
Figure 7 below.
Figure 7. JP1 and JP2 Settings

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These Jumpers allow the selection between ICC or I2C data lines. While we do the
programming the ST7 microcontroller, the jumpers must be connected on ICC side (right
side) and when the board is used for demonstration, the jumpers must be connected on the
I2C side (left side).
●JP3: As shown in the Figure 8 below, JP3 is used to select the clock source for the ST7
microcontroller.
Figure 8. JP3 Settings
The default connection of this jumper is EXT side (Left Side) that is clock source external
crystal resonator and when the board is used for demonstration. You need to connect to ICC
side (Right Side) only if it is must to provide the ICC clock to the microcontroller during the
re-programming microcontroller.
●JP4: As shown in the Figure 9 below, JP4 is used for choosing power supply to be used
for USB supply or the external board supply.
Figure 9. JP4 Settings
Connect the jumper to the Left side, whenever you want to use external power supply and to
Right side (USB side), whenever you want to use USB supply. There is no restriction as
such on using any of the power supply. You can use external power supply when you want to
use the demo board in the stand-alone mode and USB power supply while you are using the
PC GUI or in stand alone mode.
Even while providing the power to the demo from external source, you can use the PC GUI
but for that you need to provide USB connectivity using USB connector.

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2 Running the STMPE2401 port expander demo board
This Port Expander demo board consists of two main parts:
●PC GUI
●Demonstration board.
Again in Stand alone mode, the demonstration board can be used without PC GUI.
Before using the demo board in either standalone or PC GUI mode, we need to do following
jumper settings-
●Connect JP1 and JP2 to the I2C side (Left Side).
●Connect JP3 to the Left side to use external crystal oscillator
●Connect JP4 to the power supply you want to use.
2.1 Running in standalone mode
With in a few seconds after you plug in the power supply, a welcome message should come
on LCD and this means that the demo has started correctly.
After that you will see a series of messages coming on the LCD screen. At the end, you will
see a blank LCD screen and you will see all the LEDs blinking. These LEDs are the output
of the 6 PWM outputs coming from 2 STMPE2401 devices. Now the system is ready to be
used.
Again if you find that no message is coming on the LCD after giving the power supply.
Remove the power supply and plugged in again and then observe. You should now see the
message coming on the LCD. If this does not happen even after removing and plugged in
the power supply several times, you need to contact technical support.
2.1.1 PWM Output demo
You can observe the PWM out on the CRO by connecting the probe at the corresponding
LED output (there are 6 LED available in the demo board corresponding to each PWM). In
stand-alone mode the PWM output are pre-programmed and can not be changed.
2.1.2 Keypad demo
As mentioned in the Figure 10, there is a 4 x 4 normal keypad available on the demo board.
You can observe the key press event on the 16x2 LCD interface. You can observe at most 2
simultaneous key press events. For a case when you press more than 2 keys
simultaneously only first 2 keys press will be detected. All key press events are displayed in
LCD screen.

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Figure 10. Embedded 4x4 keypad
2.1.3 Dedicated keypad demo
Similar to normal Key press, there are 4 dedicated keys available on the demo board as
shown in Figure 11. In comparison to normal keypad where you can detect only 2 keys
simultaneously, here you can observe 4 dedicated keys simultaneously. All dedicated key
press events are displayed in LCD screen.
Figure 11. Dedicated keys
2.1.4 Rotator demo
The interface of Rotator is implemented in multiplexed manner with the keypad. That is
either you will observe any key press event on the LCD or the Rotator event. The rotator is
implemented using three switches as shown in Figure 12.