LSC028I18-S-V1: 2.83-Inch IPS TFT LCD Module, 240×320 Resolution, SPI Interface, Integrated Capacitive Touch Panel
Product Subtitle / Keywords
2.83 Inch Display, 240(RGB)×320 Resolution, a-Si TFT-LCD Module, Transmissive, IPS, 262K Display Colors, SPI (4-Line Serial) Interface, Integrated Capacitive Touch Panel (CTP), Operating Temperature -20°C to +70°C, Storage Temperature -30°C to +80°C, Driver IC GC9309, Backlight Driving Condition IF=80mA, VF=3V (Typ), RoHS Compliant, Spec Rev 1.0, Jiangxi Hanqin Zhizao Technology Co., Ltd. (江西汉秦智造科技有限公司).
1. Executive Summary & Product Positioning
The LSC028I18-S-V1, developed by Jiangxi Hanqin Zhizao Technology Co., Ltd. (江西汉秦智造科技有限公司), is a transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module, which is composed of a TFT-LCD panel, a driver circuit and a backlight unit. The panel size is 2.83 inch and the resolution is 240(RGB)*320, the panel can display up to 262k colors. The module type is COG+FPC+B/L+CTP.
This product specification (Revision 1.0) serves as the definitive technical document, defining the module's general description, physical features, mechanical specification (including module size, number of dots, and active area), outline dimension (including detailed mechanical drawings for both LCM and LCM+CTP, with notes on operating/storage temperature, backlight circuit, and CTP technical parameters), absolute maximum ratings (for supply voltage and temperature), electrical characteristics (including recommended operating conditions for power supplies and logic levels), pin description (for the 24-pin main interface including CTP signals), and module function description (including block diagram).
The document provides the core parameters necessary for system integration into standard 2.83-inch portrait display applications with touch functionality. The unequivocal recommendation for engineers is to strictly adhere to the mechanical and electrical specifications described herein to ensure reliable performance and compatibility.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module, which is composed of a TFT-LCD panel, a driver circuit and a backlight unit. The panel can display up to 262k colors.
- Display Resolution: Portrait format: 240(RGB) × 320 pixel array.
- Display Mode: IPS (In-Plane Switching), providing wide viewing angles (All viewing direction, as indicated by the polarizer note "ALL VIEWING").
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight) + CTP (Capacitive Touch Panel).
- Interface Type: The module uses an SPI (Serial Peripheral Interface) for data and command communication. The interface signals include SDA (data), SCLK (clock), RS (data/command), CS (chip select), RST (reset), and TE (tearing effect).
- Power Architecture: Requires dual power supplies: VDD (2.8V Typ for the core/logic) and IOVCC (2.8V Typ for the I/O interface). The backlight is powered separately through dedicated LED_A and LED_K pins. The CTP also requires a dedicated 3.3V power supply (CTP_VDD).
- Backlight: White LED backlight consisting of 4 white LEDs in parallel. The driving condition is specified as IF=80mA, VF=3V (TYP).
- Touch Panel: The module includes an integrated Capacitive Touch Panel (CTP) with an OGS (One Glass Solution) structure. The touch controller IC is CST726. The CTP interface uses I²C signals (CTP_SCL, CTP_SDA) with an interrupt (CTP_INT) and reset (CTP_RSTN). The CTP has a surface hardness of 4H and transmittance ≥85%.
- Driver IC: GC9309.
- Supplier: 江西汉秦智造科技有限公司 (Jiangxi Hanqin Zhizao Technology Co., Ltd).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Item | Specification | Unit |
|---|---|---|
| Model | LSC028I18-S-V1 | - |
| Display Size (Diagonal) | 2.83 | inch |
| Resolution | 240(RGB) × 320 | pixels |
| Module size (H×V×D) | 55.11 × 80.72 × 3.54 | mm |
| Active area (H×V) | 43.2 × 57.60 | mm |
| Number of dots | 240(RGB) × 320 | pixel |
| Display Type | IPS (Transmissive) | - |
| Module Type | COG+FPC+B/L+CTP | - |
| Touch Panel Structure | OGS (One Glass Solution) | - |
| Touch IC | CST726 | - |
| Supplier | 江西汉秦智造科技有限公司 (Jiangxi Hanqin Zhizao Technology Co., Ltd) | - |
3.2 Interface & Electrical Specifications
3.2.1 Absolute Maximum Ratings (From Section 5)
| Item | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V |
| Supply voltage | IOVCC | -0.3 | 4.6 | V |
| Operating temperature | TOPR | -20 | 70 | °C |
| Storage temperature | TSTR | -30 | 80 | °C |
3.2.2 Recommended Operating Conditions (From Section 6)
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage (LCD Core) | VCC | 2.6 | 2.8 | 3.5 | V |
| Supply voltage (I/O) | IOVCC | 1.65 | 2.8 | 3.5 | V |
| Input Voltage 'L' level | VIL | 0 | --- | 0.3*IOVCC | V |
| Input Voltage 'H' level | VIH | 0.7*IOVCC | --- | IOVCC | V |
3.2.3 Pin Description (24-Pin Main Interface, From Section 7-2)
The module uses a 24-pin FPC connector which integrates the LCM and CTP interface signals.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1, 9, 14, 17, 24 | GND | P | Ground |
| 2, 3, 10, 11 | MESH1, MESH3, MESH4, MESH2 | NC | No Connection (Mesh/pin for EMC) |
| 4 | CTP_VDD | P | Power Supply for CTP (3.3V) |
| 5 | CTP_SCL | I | SCL pin for TP (I²C clock) |
| 6 | CTP_SDA | I/O | SDA pin for TP (I²C data) |
| 7 | CTP_INT | I | Interrupt signal for TP |
| 8 | CTP_RSTN | I | Reset Pin for TP (Active Low) |
| 12 | LEDK | P | Power for LED backlight cathode |
| 13 | LEDA | P | Power for LED backlight anode |
| 15 | SDA | I/O | Serial data input (SPI Data) |
| 16 | SCLK | I | Serial interface clock (SPI Clock) |
| 18 | RS | I | Display data/command selection pin (SPI DC) |
| 19 | CS | I | Chip select pin (SPI CS) |
| 20 | RST | I | Reset signal for LCD Driver (Active Low) |
| 21 | TE | O | Tearing effect output pin to synchronize MPU to frame writing, activated by S/W command. |
| 22 | IOVCC | P | Power Supply for I/O System |
| 23 | VDD | P | Power Supply for Core/Logic (2.8V) |
3.3 Timing Characteristics (From Section 7)
The document includes a block diagram of the LCM showing the connection between the Interface, Source Driver, Gate Driver, TFT-LCD, and Back Light. Detailed timing parameters and diagrams for the SPI interface and power on/off sequences are referred to in section 7.3 and 7.4 of the full specification document.
3.4 Backlight Driving Conditions
The backlight circuit from the outline drawing notes: IF=80mA, VF=3V (TYP). This indicates 4 white LEDs in parallel, requiring a constant current driver capable of delivering 80mA at approximately 3V. The total backlight power is 80mA × 3V = 240mW.
3.5 Touch Panel Technical Parameters
The CTP technical parameters from the drawing include:
- TP Structure: OGS (One Glass Solution).
- IC Selection: CST726.
- Transmittance: ≥85%.
- Surface Hardness: 4H.
- Operating Environment: -20°C~+70°C, ≤85% RH.
- Storage Environment: -30°C~+80°C, ≤85% RH.
- RoHS Compliance: Yes.
4. Application Guidelines & Critical Notes
Intended Use
- Standard 2.83-inch portrait display applications (e.g., smart home panels, industrial handhelds, IoT devices).
- Systems requiring a QVGA (240×320) resolution with an IPS display for wide viewing angles.
- Applications requiring a built-in capacitive touch panel (CTP) with an OGS structure for durability and clarity.
- Systems utilizing an SPI interface for display communication.
Critical Design Considerations
- Dual Power Supply (VDD=2.8V for Core, IOVCC=2.8V for I/O): The module requires a stable 2.8V supply for the core/analog circuitry and a separate I/O supply (can be 1.65V to 3.5V, with 2.8V as typical). The logic thresholds (VIL, VIH) are referenced to IOVCC.
- SPI Interface (4-Line Serial): The module uses a standard 4-line SPI interface. The signals are SDA (Serial Data), SCLK (Serial Clock), RS (Data/Command), and CS (Chip Select).
- External Backlight Driver (80mA @ 3V): The backlight consists of 4 LEDs in parallel, requiring a constant current driver capable of delivering 80mA at a forward voltage of 3V (Typ).
- I²C Capacitive Touch Panel Interface: The CTP uses an I²C interface (CTP_SCL, CTP_SDA) with a dedicated reset pin (CTP_RSTN) and an interrupt output (CTP_INT). The touch controller IC is CST726. The host must initialize the touch controller by providing a reset pulse and then communicate over I²C to configure and read touch data. The CTP requires a 3.3V power supply (CTP_VDD).
- IPS Display with ALL Viewing Direction: The display uses IPS technology, providing excellent viewing angles in all directions.
- Reset Sequence: The RST pin (Pin 20) is an active-low reset signal for the LCD driver. The CTP_RSTN (Pin 8) is a separate active-low reset for the touch controller. Both must be properly handled.
- TE (Tearing Effect) Pin: The TE pin (Pin 21) is an output from the driver IC that can be used to synchronize the host's frame writes to the display's internal frame memory. This prevents tearing artifacts.
- Temperature Range (-20°C to +70°C Operating): A standard consumer/industrial temperature range.
- Mechanical Integration (Module Outline 55.11mm × 80.72mm × 3.54mm): The module has a total thickness of 3.54mm. Important mechanical notes include: foam opening should be 0.3mm larger than LCD AA on each side, recommended TP VA opening should be 0.4mm larger than LCD AA on each side, flatness curvature ≤ 0.35mm, and the product is RoHS compliant.
- ESD and Handling: Standard ESD precautions must be observed during handling and assembly.
Handling & Compliance
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass – handle with care. Avoid mechanical stress on the active area or FPC.
- Do not attempt to disassemble or modify the LCD module.
- The module is RoHS compliant.
5. Conclusion & Design-In Support
The LSC028I18-S-V1 specification details a versatile 2.83-inch QVGA (240×320) IPS TFT LCD module with an integrated capacitive touch panel (OGS, CST726), dual-power supply (2.8V/3.3V), and an SPI interface — a suitable choice for embedded applications requiring a high-quality touch display with wide viewing angles.
Key Strengths
- Simple SPI Interface: Easy to interface with most microcontrollers with minimal pin count.
- Integrated Capacitive Touch Panel (OGS): Provides a complete touch display solution with enhanced durability and clarity (Transmittance ≥85%).
- IPS Display Technology with Wide Viewing Angle: Superior wide viewing angles (ALL VIEWING) ensure excellent readability from any angle.
- Compact 2.83-inch Form Factor: Suitable for portable and space-constrained designs.
- Detailed Mechanical Drawings and Pinout: Clear mechanical drawings and pin assignments facilitate straightforward system integration.
Main Design Focus
- The critical design tasks are providing dual power supplies (VDD=2.8V, IOVCC=2.8V for LCD, CTP_VDD=3.3V for Touch) with proper decoupling, implementing a constant-current LED backlight driver (80mA at 3V), configuring the host processor's SPI interface (SDA, SCLK, RS, CS) with the correct timing (refer to the GC9309 datasheet), and initializing and communicating with the CST726 touch controller over I²C (CTP_SCL, CTP_SDA, CTP_INT, CTP_RSTN).
- Supporting requirements: Connect all ground pins. Ensure the RST pin can be driven low for a proper reset sequence. Integrate the TE pin for frame synchronization if needed.
This module is a practical and high-performance choice for engineers designing embedded systems that require an easy-to-use SPI-based touch display with excellent IPS viewing angles.
