MAX1441 Proximity and Touch Sensor Programmer User Manual

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Keywords: passive keyless entry, PKE, remote keyless entry, RKE, signal conditioner, low power, proximity sensor, touch sensor, RF ID
readers, meter tampering prevention
APPLICATION NOTE 5280
MAX1441 Proximity and Touch Sensor Programmer User Manual
By: Youssof Fathi
Dec 21, 2011
Abstract: The MAX1441 proximity and touch sensor is designed for capacitive proximity sensing applications, including automotive passive
remote keyless entry (PRKE). The sensor has 2-kwords of embedded flash that must be programmed with the user’s application firmware.
This programmer was developed to facilitate programming of the MAX1441 flash memory in a production environment. The programmer
continuously polls the USB-to-JTAG interface for a communicating MAX1441. Once the MAX1441 device is found, it will erase, program,
and verify the embedded flash memory in approximately 3 seconds. It will then start polling for the next MAX1441 to be programmed.
Multiple instances of the application can be launched on the same computer.
Introduction
For any manufacturing line, minimizing cost and maximizing efficiency are main concerns. To facilitate achieving this goal, Maxim has
developed application software to program the MAX1441 automotive proximity and touch sensor's embedded flash memory in a production
environment. The software will continuously poll the JTAG interface through the USB port for a communicating MAX1441. Once the
MAX1441 device is found, it will perform a master erase of the flash memory, write the specified firmware into the flash memory, and verify
its content. All three operations will be completed in approximately 3 seconds. The MAXQUSBJTAG-KIT device-driver must be properly
installed before launching the software.
The MAX1441 Programmer Software verifies completion of all the necessary operations before moving forward, guaranteeing that no extra
time is spent and that the operation has been completed. Also, no user interaction is necessary with mouse or keyboard for the whole
programming sequence. The user only inserts the MAX1441 and removes it after programming is complete, as the software automatically
detects the presence or absence of the MAX1441. To avoid hot-plugging the MAX1441, an on/off power switch may be required. It is
possible to run multiple instances of the application on the same computer. An available USB port and a MAXQUSBJTAG-KIT is required
for each instance. When multiple instances of the application are running, there is no need to know which communication (COM) port the
operating system has assigned to a particular socket. The preferred sequence of starting multiple instances of the application is to connect
hardware of one instance to a USB port and start the programming for one device before starting the next one.
Requirements
The MAX1441 Programmer software requires the following:
a. Windows XP®/Windows Vista®/7 (32 or 64-bit) computer.
b. One available USB port for each instance of application running.
c. One Maxim USB-to-JTAG board (MAXQUSBJTAG-KIT) for each instance of application running.
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d. Required power supply for MAX1441 VBAT terminal.
e. Firmware file with the HEX extension, in the same directory as the application.
f. Test socket to receive the MAX1441.
Software Installation
Download and extract the MAX1441_programmer.zip in a temporary folder. Run Install_MAX1441_Programmer.exe and follow instructions.
The MAX1441_programmer application and supporting files will be downloaded in the folder specified during installation. Default directory
is C:\MAX1441. At the completion of installation, the content of the folder should look similar to Figure 1.
Figure 1. File contents of the c:\MAX1441 folder.
Driver Installation
Double-click on the CDM20814_Setup file to install the FTDI Virtual Com-Port Driver. A screen similar to the one in Figure 2 will appear.
Driver installation will start and, at the completion, the window automatically closes.
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Figure 2. Virtual Communication Port Driver installation.
USB-JTAG Adapter
After the FTDI Virtual Communication Port Driver is installed, connect a MAXQUSBJTAG-KIT (Figure 3) to an available USB port, using a
mini-USB connector.
Figure 3. The Maxim USB-JTAG adapter (MAXQUSBJTAG-KIT).
Once the adapter is found as a new hardware by the operating system, proper drivers installed in the previous step should be loaded. To
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verify, open the Device Manager, and check for the device under Ports (COM & LPT). See Figure 4.
Figure 4. A Maxim USB-to-JTAG converter identified as USB Serial Port.
For detailed information about the Maxim USB-to-JTAG adapter, including further details about driver installation, electrical characteristics,
and features, refer to the MAXQUSBJTAG-KIT PDF file, also present in the installation directory.
Programming Procedure
There are two ways to start the MAX1441 Programmer application: directly and via a shortcut. Starting the application through a shortcut is
the preferred way.
Starting the Programmer Directly
To start the MAX1441 Programmer directly, double-click on the MAX1441_Programmer application file. On detailed file view, the
programmer folder should look similar to one in Figure 5.
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Figure 5. Detailed View of C:\MAX1441 folder, indicating the application for direct launch.
After the Programmer starts, it will scan the system for available COM ports and search for the Maxim USB-to-JTAG interface board.
Once a USB-to-JTAG interface is identified, a screen will appear (Figure 6). All HEX files (firmware) in the folder from which the
application was launched will be listed. Note that the identified COM port is listed on the window-header.
Figure 6. Screen shown when the MAX1441 Programmer is started directly.
Type in the complete file name (including the file extension) of the desired firmware to be used in the programming session.
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Notes:
Do not create filenames with spaces; use underscores, "_", instead.
Keep firmware filenames short if possible.
Starting the Programmer from a Shortcut
To start the Programmer from a shortcut, first create a shortcut to the MAX1441 Programmer application. In the shortcut's properties,
specify the firmware filename.
Using a shortcut eliminates the need to type in a firmware file name every time application is started. And because the shortcut already
has the file name information, it eliminates operator error and thus makes it an ideal choice in a production environment. To verify and/or
modify information in the shortcut, right-click on the shortcut and select Properties (Figure 7). The default Target in the Properties |
Shortcut tab is C:\Max1441\max1441_programmer.exe appcode.hex, where "appcode.hex" is the firmware name to be written to the
MAX1441 devices. For ease of use, copy the shortcut on the PC desktop and launch it from there.
Figure 7. Properties window of "MAX1441_Programmer" shortcut.
Once the MAX1441 Programmer has started, through a direct launch or shortcut, a screen will appear where the firmware file name and
the COM port are shown in the title bar (Figure 8).
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Figure 8. MAX1441 Programmer Search Mode.
At this point, the software is actively looking for a MAX1441. The progress bar completes in approximately 13 seconds, and it returns to
the beginning if a MAX1441 is not found. The Programmer will terminate and close if any key on the keyboard is pressed.
Once a MAX1441 is found, flash memory programming starts and a window similar to the one in Figure 9 will be display.
Figure 9. Programming Mode of the MAX1441 Production Programmer.
Caution: The MAX1441 interface must NOT be disturbed while programming is in progress (while the yellow window is showing). Any
interruption in communication between the programmer and the MAX1441 will cause programming to fail.
The Programming line in Figure 9 shows the process progress. The "*" symbols indicate memory erasing, and the periods indicate
progress in writing to flash memory. Each period indicates programming of 32 words (64 bytes) of memory. Total number of periods
displayed will depend on the size of the application firmware. Once the programming session is completed, a green or a red window will
show. If the device programming was successful, a green window will display (Figure 10). The programmer will immediately start
searching for the next device to program. If the setup is not disturbed and same device is left in the setup, it will be reprogrammed after
approximately 10 seconds. To terminate the application, press the ESC key, and to start reprogramming the same device without further
delay, press any other key. If the device is removed from the setup, a window similar to that in Figure 8 will appear and programming will
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start as soon as a communicating MAX1441 is reloaded.
Figure 10. Pass Status screen of MAX1441 Programmer.
If programming of the MAX1441 is not successful, a red window will display (Figure 11). Remove the device and load another one, press
any key (but the ESC key) to reprogram the same device, or press the ESC key to terminate the application.
Figure 11. Fail Status screen of the MAX1441 Programmer.
In addition to displaying the green and red windows to indicate pass or fail programming of flash memory, the programmer will also toggle
the OUT1 and OUT2 pins of the MAX1441 to reflect the programming operation progress and results:
At the completion of flash-erase operation, both OUT1 and OUT2 pins will be pulled low and released. On the MAX1441 evaluation
board, this will cause LED1 and LED2 to blink.
If programming the flash is successful, OUT1 pin will be pulled low. On the MAX1441 evaluation board, this will cause LED1 to turn
on. OUT1 will be kept low until MAX1441 is removed or next programming cycle is started.
If programming the flash is unsuccessful, OUT2 pin will be pulled low. On the MAX1441 evaluation board, this will cause LED2 to
turn on. OUT2 will be kept low until MAX1441 is removed or next programming cycle is started.
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When the programming of the current MAX1441 is complete, remove the device from the socket and insert the next one to be
programmed.
This application can be utilized in an automated manufacturing environment by using state of OUT1 and OUT2 pins to sort out (bin) the
good and bad devices.
Caution: While the MAX1441 Programmer is running, do not disconnect the USB cable connecting the Maxim USB-to-JTAG interface
board to the computer. Any interruption will cause application to crash.
Windows Vista is a registered trademark and registered service mark of Microsoft Corporation.
Windows XP is a registered trademark and registered service mark of Microsoft Corporation.
Related Parts
MAX1441
Automotive, Two-Channel Proximity and Touch Sensor
MAX1441EVSYS
Evaluation System for the MAX1441
MAXQUSBJTAG-KIT
Evaluation Kit for the MAXQ USB-to-JTAG Board
More Information
For Technical Support: http://www.maximintegrated.com/support
For Samples: http://www.maximintegrated.com/samples
Other Questions and Comments: http://www.maximintegrated.com/contact
Application Note 5280: http://www.maximintegrated.com/an5280
APPLICATION NOTE 5280, AN5280, AN 5280, APP5280, Appnote5280, Appnote 5280
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