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What is the typical, worst case, and surge current requirements for the SLCD43 Module (Part Number 51-0105-01)?

The typical room temperature current is as follows, measured at 5V DC input: CASE 1 –  Full bright “xbb 255”, blank screen: 238mA CASE 2 – Full bright “xbb 255”, checkerboard screen: 243mA (the checkerboard pattern alternating white and black pixels is worst-case panel power) These are typical numbers. We quote the absolute worst case (400mA) on the datasheet; it is improbable that all parts of any particular module will be the worst case. See the inrush power on applying power to the module in the image below. This surge charges the tantalum capacitors on the board. The module contains a supervisor reset chip MCP809T with a minimum delay of 150mS from power. So as long as the caps are charged in 100mS, all will be well. You could easily limit the inrush current to 400mA and be okay.

What is the typical, worst case, and surge current requirements for the SLCD43 Module (Part Number 51-0105-01)?2022-04-08T11:01:00-07:00

How many volts can the SLCD43 reset line take? We want to hold the reset line at 5 volts high, and set it low to reset, but weren’t sure if the board could handle it.

The RESET input is driven high (to 3.3v) by the on-board reset controller. You can drive it low through an open-collector circuit to reset the board, but you should not drive it high. If you need to, use the voltage present on J1 pin 1.

How many volts can the SLCD43 reset line take? We want to hold the reset line at 5 volts high, and set it low to reset, but weren’t sure if the board could handle it.2022-04-08T11:01:41-07:00

Can you provide a responsiveness speed guarantee for time sensitive applications (i.e. time for a button press to be detected and sent to the RS-232 port)?

Detection time depends on user-adjustable touch parameters. Factory settings recognize touches in around 20ms. The corresponding serial response sends immediately if no commands are being executed. However, there is no guarantee since the screen could be performing some command when the unit is touched. The evaluation kit unit has a very responsive keyboard demo. However, the ultimate response time depends on how the unit is used.

Can you provide a responsiveness speed guarantee for time sensitive applications (i.e. time for a button press to be detected and sent to the RS-232 port)?2022-04-08T11:04:00-07:00

How can I balance bitmap display performance and storage use?

Compressing bitmaps in our SLCD products allows you to save Flash memory space. The disadvantage is that compressed bitmaps display more slowly. To balance performance and Flash display storage, it is best to use the “Enable Bitmap Compression” checkbox in the BMPload application. For bitmaps that are large (i.e., cover the entire screen), or are re-drawn often, disable compression by inserting the string “.unc” into the file name (e.g. “01_MyBitmap.unc.bmp”). This string tells the BMPload program not to compress this image. Background bitmaps for slider objects and meter objects and sliding graphics (“xio” command) need to be uncompressed. Using the strategy above should keep your application visually responsive while conserving Flash memory for future additional bitmaps.

How can I balance bitmap display performance and storage use?2022-04-08T11:04:47-07:00

What is the difference between the horizontal mount and the vertical mount?

The “Vertical Mount” display module has mounting tabs on the long sides of the display module, with the tabs aligned vertically when the module is in landscape orientation. The “Horizontal Mount” display module has these tabs on the short sides, with the tabs aligned horizontally when the module is in landscape orientation. The two options allow customers to fit a module into either a narrow or short space. In both cases, the default orientation is landscape, with the long sides horizontal, but the modules may also be used in portrait mode with an alternate firmware load.

What is the difference between the horizontal mount and the vertical mount?2022-04-08T11:06:01-07:00

Do I need to use a gasket between the display module and my front panel, or can I mount the module directly to the front panel?

Mounting the LCD and touch panel directly against the chassis front panel is not recommended. The panel specifications for all of our display modules show how the LCD and touch panel will be mounted. It must have a gasket, and we offer silicon foam gaskets for some of our modules. You will need to use a “soft” gasket and plan on some tension on the display module mounting tabs, but you should not plan on flexing the tabs. You will need to use stand-offs or spacers between the front bezel and the display module to ensure that you can apply enough pressure to compress the gasket to get a seal but not so much pressure as to flex the mounting tabs. The stand-offs will also provide a secure mounting for the display module. We use a black silicone foam product called “HT-800“. We use the version with adhesive on one side [...]

Do I need to use a gasket between the display module and my front panel, or can I mount the module directly to the front panel?2022-04-08T11:08:28-07:00

I need a gasket/buffer material between your display module and my front panel. Who makes these?

We use die-cut gaskets for our enclosed units from Precision Die Cutting. The material we use is a black silicone foam product called “HT-800.” You can also check with Gasket Specialties about the products they offer. Reach Technology offers gaskets for some modules. Visit mounting options for more information.

I need a gasket/buffer material between your display module and my front panel. Who makes these?2022-04-08T11:26:12-07:00

Could you provide some guidance in mounting in a bezel?

Check in the Panel Specifications for your display module. They often contain mounting guidelines. If not, you can also refer to the general policies in one of these documents: Resistive Touchscreen Integration Projected Capacitive Touchscreen Integration

Could you provide some guidance in mounting in a bezel?2022-04-08T11:26:50-07:00
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