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12x2 Gray/Blue/Yellow Green Character LCD - MCU
DM-LCD1202-418, DM-LCD1202-419, and DM-LCD1202-420 are 12-character by 2-line LCD modules developed around the ST7066U dot-matrix LCD controller. The three variants share the same mechanical outline, 5.0 V nominal logic supply, 6800-series parallel MPU interface, 1/16 duty operation, and 6:00 viewing direction.
The variants differ in LCD mode, panel color, backlight color, optical performance, backlight electrical requirements, and weight. Select the datasheet that matches the required gray, blue, or yellow-green version before completing the electrical and mechanical design.
The specifications below consolidate the shared mechanical, controller, interface, electrical, and environmental data stated in the three official module datasheets. Variant-dependent values are separated in the following section.
| Parameter | Verified Specification |
|---|---|
| Product Models | DM-LCD1202-418, DM-LCD1202-419, and DM-LCD1202-420 |
| Display Format | 12 characters × 2 lines |
| Character Format | 5×8 dots in two-line mode |
| Controller IC | ST7066U |
| Interface | 6800-series parallel MPU interface |
| Bus Modes | 4-bit mode using DB4 to DB7, or 8-bit mode using DB0 to DB7 |
| Logic Supply Voltage | 4.5 V minimum, 5.0 V typical, 5.5 V maximum |
| Digital Operating Current | 1.2 mA typ. at VDD = 5.0 V |
| Input Low Voltage | VSS to 0.6 V |
| Input High Voltage | 0.7 × VDD to VDD |
| Output Low Voltage | 0.4 V maximum |
| Output High Voltage | 3.9 V minimum |
| Module Outline | 55.7 ± 0.5 mm × 32.0 ± 0.5 mm × 14.5 mm maximum |
| Viewing Area | 46.0 mm × 14.5 mm |
| Active Area | 37.85 mm × 11.7 mm |
| Viewing Direction | 6:00 |
| Duty Cycle | 1/16 |
| Interface Pins | 15 pins: VSS, VDD, VO, RS, R/W, E, DB0 to DB7, and backlight anode A |
| Pin Pitch | 1.27 mm across the 15-pin row |
| Operating Temperature | -20°C to +70°C, listed as absolute maximum limits |
| Storage Temperature | -30°C to +80°C, listed as absolute maximum limits |
| Response Time at 25°C | 300 ms typical, 400 ms maximum for rise time plus fall time |
| Touch Function | No touch controller or touch interface is specified in the supplied module datasheets |
Optical values, backlight requirements, LCD mode, and module weight are not identical across the three color options. Use the values for the exact SKU being evaluated.
DM-LCD1202-418
Transflective mode
White LED backlight
DM-LCD1202-419
Transmissive mode
White LED backlight
DM-LCD1202-420
Transflective mode
Yellow-green LED backlight
The ST7066U accepts either one 8-bit transfer or two 4-bit transfers. In 4-bit mode, DB4 to DB7 carry the data and DB0 to DB3 are not used for transfer.
Use the module limits rather than the standalone controller operating range when designing the host interface. The module datasheets specify a 5.0 V nominal logic supply and variant-specific LED requirements.
These limits are common to the three module variants.
At VDD = 5.0 V, the guaranteed high-input threshold is 3.5 V. A 3.3 V host may not meet the specified VIH margin, so verify the interface or use suitable level translation.
The gray and blue variants use a white LED backlight. The yellow-green variant uses a different LED voltage range and should not be substituted without reviewing the drive circuit.
VO is specified as a variable LCD operating-voltage input. Include an adjustable or validated bias arrangement during prototype evaluation.
Review the complete drawing before PCB release. The outer outline, viewing window, active character area, pin location, mounting features, and side-view depth all affect the enclosure and board layout.
The drawing shows a 15-position pin row at 1.27 mm pitch and four R1.25 mounting cutouts. Confirm pad geometry, board clearance, display-window alignment, and enclosure tolerance against the official drawing before ordering production quantities.
These are stated qualification-test conditions for engineering review. They should not be interpreted as a field-life guarantee or as permission to operate outside the specified temperature limits.
80°C for 200 hours.
-30°C for 200 hours.
+70°C for 200 hours and -20°C for 200 hours.
60°C at 90% RH for 96 hours under the stated no-load condition.
-20°C to +70°C for 10 cycles.
The most important interface check is the relationship between the module supply and the host processor's guaranteed logic-high output.
With the module operated at VDD = 5.0 V, the specified minimum high-input voltage is 3.5 V. Verify this margin rather than assuming direct compatibility with every 3.3 V controller.
Confirm the SKU, LCD mode, panel color, backlight color, backlight voltage, backlight current, optical values, and weight before approving the design.
Follow the official ST7066U initialization sequence and required delays. Do not send normal commands before the controller supply and initialization conditions are satisfied.
Pin 3 is a variable LCD operating-voltage input. Evaluate the required contrast-bias arrangement under the intended supply voltage and temperature range.
Use the selected SKU's LED voltage and current limits. Confirm current limiting, thermal conditions, polarity, and the final backlight connection before prototype assembly.
Use the official drawing for the display window, active area, board outline, mounting cutouts, pin pitch, and maximum depth. Confirm the current revision before tooling.
Sample availability, production lead time, packing, lifecycle status, and customization scope should be confirmed with DisplayModule before ordering.
These answers distinguish shared family characteristics from specifications that depend on the selected color variant.
Yes. The ST7066U supports 4-bit and 8-bit operation. In 4-bit mode, DB4 to DB7 are used and each byte is transferred in two operations.
Direct operation is not guaranteed by the stated input threshold. At a 5.0 V module supply, VIH minimum is 3.5 V. Verify the host output level or use appropriate level translation.
No. The gray and blue variants specify a 3.4 to 3.6 V white LED backlight. The yellow-green variant specifies a 4.0 to 4.7 V yellow-green LED backlight.
The supplied datasheets state the same module outline and display format. Electrical backlight requirements, optical values, and weight differ, so the complete SKU-specific datasheet must still be reviewed.
No touch controller, touch-panel interface, or touch specification is listed in the supplied module datasheets. Confirm separately if an external touch overlay is required.
Use DM-LCD1202-418 for gray, DM-LCD1202-419 for blue, and DM-LCD1202-420 for yellow green. Use the ST7066U document for detailed controller instructions and interface behavior.
No. Each variant has its own luminance specification. The gray and yellow-green datasheets identify their values as measurements without the LCD, while the blue datasheet lists a module luminance value.
Confirm the exact SKU, datasheet revision, logic-level compatibility, backlight drive, VO bias, pin arrangement, mechanical drawing, sample performance, availability, and lead time.
Select the document that matches the required panel color and SKU. The module datasheets provide dimensions, pin assignments, electrical limits, optical characteristics, timing information, initialization guidance, reliability conditions, and mechanical drawings.