Product Subtitle / Keywords:
3.5 Inch Display, 320(RGB)×480 Resolution, Transmissive a-Si TFT-LCD, MCU/SPI Interface, COG+FPC+B/L, 16.7M Colors, ST7365P Driver, 54.5×83.0×2.2 mm, -20°C~60°C Operating Temperature
1. Executive Summary & Product Positioning
The LS035I06-M-V1, developed by Lixin (Wan'an) Intelligent Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 3.5-inch transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module.
This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (TFT-LCD panel, a driver circuit and a backlight unit), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete MCU/SPI Interface pinout and timing, and comprehensive electro-optical performance. It delivers a resolution of 320(RGB)×480 with 16.7M-color display capability, driven by the ST7365P controller.
The document provides the core parameters necessary for system integration into compact embedded display applications. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, interface timing, and mechanical tolerances 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.
- Display Mode: Active matrix TFT-LCD module, which is composed of a TFT-LCD panel, a driver circuit and a backlight unit.
- Display Format: Graphic 320(RGB)×480 Dot-matrix.
- Display Characteristics: Capable of displaying up to 16.7 million colors.
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit).
- Input Data: MCU/SPI.
- Drive IC: ST7365P.
- Approval Status: ☑ Approved Product Specification only (as per signature block).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Item | Specification | Unit |
|---|---|---|
| Module size (H×V×D) | 54.5 × 83.0 × 2.2 | mm |
| Number of dots / Resolution | 320(RGB) × 480 | pixel |
| Active area (H×V) | 48.96 × 73.44 | mm |
Critical Mechanical Design Notes (from outline dimension drawing):
- Display Type: Main LCD: A-SI TFT.
- Operating Temperature: -20°C ~ 70°C.
- Storage Temperature: -30°C ~ 80°C.
- Main LCD Driver: ST7365P.
- Backlight: 2S:0.2±0.05, 40W:0.3±0.05, P:(40-1)*0.5=19.5±0.1.
- General Tolerance: ±0.2mm (for segments to edge of glass).
- Enclosure Design Notes:
- It is recommended that the housing visible area be 0.3mm smaller per side than the V.A (Viewing Area).
- It is recommended that the housing foam opening window be 0.6mm larger per side than the V.A.
- The TP edge must not contact metal conductors.
- RoHS Compliance: The module is RoHS compliant.
- FPC Total Thickness: PI补强+FPC总厚=0.30±0.03mm.
- Backlight Circuit: LEDA (Anode) and LEDK (Cathode) pins are provided.
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V | Note1 Note2 |
| Supply voltage | IOVCC | -0.3 | 4.0 | V | Note1 Note2 |
| Operating temperature | TOPR | -10 | 60 | °C | Note1 Note2 |
| Storage temperature | TSTR | -20 | 70 | °C | Note1 Note2 |
3.2.2 Pin Description (Selected Pins from Chapter 7)
The module uses a multi-pin interface. A selected list of relevant pins is provided below:
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 5 | GND | P | System ground |
| 6 | VDD | P | Power supply |
| 7 | VDD | P | Power supply |
| 8 | TE | O | Tearing effect output. |
| 9 | CS | I | Chip selection pin. Low-active. |
| 10 | RS | I | Display data/command selection (RS) pin in MCU interface. |
| 11 | WR | I | Write enable in MCU parallel interface. In SPI mode, this pin is used as SCL. |
| 12 | RDX | I | Read enable in 8080 MCU parallel interface. Low-active. |
| 13 | SDA | I | SPI interface input/output pin. |
| 37 | GND | P | System ground |
| 38 | IM0 | I | The MCU interface mode select. |
| 39 | IM1 | I | The MCU interface mode select. |
Interface Summary:
- MCU Interface: The module supports an 8080-series MCU parallel interface (18/16/9/8-bit bus) using CS, RS, WR, RDX, and data bus pins (DB0-DB17).
- SPI Interface: The module also supports an SPI interface using CS, SCL (WR pin), and SDA pins.
- Interface Mode Selection: The interface mode is selected by the IM0 and IM1 pins.
- Control Pins: RESX (Reset), TE (Tearing Effect Output).
- Backlight: Dedicated LEDA (Anode) and LEDK (Cathode) pins.
- Power: VDD for main logic, GND for ground.
3.2.3 Timing Characteristics (8080 Series MCU Parallel Interface)
Conditions: VDDI=1.8V, VDDA=2.8V, AGND=DGND=0V, Ta=25°C.
| Signal | Symbol | Parameter | Min | Max | Unit |
|---|---|---|---|---|---|
| D/CX | $T_{AST}$ | Address setup time | 0 | - | ns |
| D/CX | $T_{AHT}$ | Address hold time (Write/Read) | 10 | - | ns |
| CSX | $T_{CHW}$ | Chip select "H" pulse width | 0 | - | ns |
| CSX | $T_{CS}$ | Chip select setup time (Write) | 15 | - | ns |
| CSX | $T_{RCS}$ | Chip select setup time (Read ID) | 45 | - | ns |
| CSX | $T_{RCSFM}$ | Chip select setup time (Read FM) | 355 | - | ns |
| CSX | $T_{CSF}$ | Chip select wait time (Write/Read) | 10 | - | ns |
| CSX | $T_{CSH}$ | Chip select hold time | 10 | - | ns |
| WRX | $T_{WC}$ | Write cycle | 66 | - | ns |
| WRX | $T_{WRH}$ | Control pulse "H" duration | 15 | - | ns |
3.2.4 Timing Characteristics (SPI Interface)
Conditions: VDDI=1.8V, VDDA=2.8V, AGND=DGND=0V, Ta=25°C.
| Signal | Symbol | Parameter | Min | Max | Unit |
|---|---|---|---|---|---|
| CSX | $T_{CS}$ | Chip select setup time (write) | 15 | - | ns |
| CSX | $T_{CSH}$ | Chip select hold time (write) | 15 | - | ns |
| CSX | $T_{CS}$ | Chip select setup time (read) | 60 | - | ns |
| CSX | $T_{CSH}$ | Chip select hold time (read) | 65 | - | ns |
| CSX | $T_{CHW}$ | Chip select "H" pulse width | 40 | - | ns |
| SCL | $T_{SCYCW}$ | Serial clock cycle (Write) | 66 | - | ns |
| SCL | $T_{SHW}$ | SCL "H" pulse width (Write) | 15 | - | ns |
| SCL | $T_{SLW}$ | SCL "L" pulse width (Write) | 15 | - | ns |
| SCL | $T_{SCYCR}$ | Serial clock cycle (Read) | 150 | - | ns |
| SCL | $T_{SHR}$ | SCL "H" pulse width (Read) | 60 | - | ns |
| SCL | $T_{SLR}$ | SCL "L" pulse width (Read) | 60 | - | ns |
| SDA (DIN) | $T_{SDS}$ | Data setup time | 10 | - | ns |
| SDA (DIN) | $T_{SDH}$ | Data hold time | 10 | - | ns |
| DOUT | $T_{ACC}$ | Access time | 10 | 50 | ns |
| DOUT | $T_{OH}$ | Output disable time | 15 | 50 | ns |
3.3 Optical & Electro-Optical Characteristics
(Not explicitly provided in the extracted document excerpt; refer to the full specification for detailed optical characteristics.)
Key Optical Notes (from document):
- Viewing Angle: The viewing angle is the angle at which the contrast ratio is greater than 10.
- Contrast Ratio (CR): Defined as the ratio of luminance when displaying a white raster to luminance when displaying a black raster.
- Transmittance: Transmittance is the value without APF and without CG.
- Color Chromaticity: The color chromaticity coordinates shall be calculated from the spectral data measured with all pixels first in red, green, blue and white.
- Response Time: The times needed for the luminance to change from 10% to 90% is Tr, and 90% to 10% is Tf.
3.4 Version Record
| Version | Revise Date | Page | Content |
|---|---|---|---|
| 00 | 2024-12-30 | ALL | New released |
4. Application Guidelines & Critical Notes
Intended Use
- Industrial control panels and human-machine interfaces (HMIs)
- IoT display nodes and smart home controls
- Handheld instruments and consumer electronics
- Any application requiring a compact, high-resolution display with flexible interface options
Critical Design Considerations
-
Interface (MCU/SPI): This module supports both MCU parallel interface and SPI interface, providing flexibility for different host MCUs. The interface mode is selected by the IM0 and IM1 pins.
-
Power Supply:
- Provide stable VCC (-0.3V to 4.6V) for the main logic.
- Provide stable IOVCC (-0.3V to 4.0V) for the I/O interface.
- The backlight requires a constant-current LED driver connected to LEDA (Anode) and LEDK (Cathode) pins.
-
Mechanical Integration:
- Module Outline: 54.5mm (H) × 83.0mm (V) × 2.2mm (D).
- Active Area: 48.96mm × 73.44mm.
- FPC: The module uses a multi-pin FPC with PI reinforcement.
- Enclosure Design: The document provides specific recommendations for enclosure window openings relative to the V.A (Viewing Area).
-
Temperature Limits:
- Operating Temperature: -10°C to +60°C.
- Storage Temperature: -20°C to +70°C.
Handling & Compliance
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass and an FPC – handle with care.
- Avoid bending the FPC sharply, especially near the connector interface.
- The module is RoHS compliant.
5. Conclusion & Design-In Support
The LS035I06-M-V1 specification details a versatile 3.5-inch display module with MCU/SPI interface and ST7365P driver — an excellent choice for applications requiring a compact display with flexible interface options.
Key Strengths:
-
Flexible Interface: Supports both MCU parallel interface and SPI interface, providing compatibility with a wide range of host MCUs.
-
High Resolution: 320×480 resolution provides clear and detailed image quality.
-
High Color Depth: 16.7M colors (24-bit true color) provides excellent color reproduction.
-
Compact Size: The 3.5-inch size is suitable for a wide range of embedded applications.
-
Standard Driver IC: The ST7365P driver IC is widely supported, simplifying software development.
Main Design Focus:
- The critical design task is properly configuring the interface mode (IM0/IM1 pins) and implementing the corresponding timing (MCU parallel or SPI) to ensure reliable data transfer.
- Supporting requirements:
- Provide stable VCC and IOVCC power.
- Provide a constant-current backlight driver.
- Mechanical integration — the module outline is 54.5mm × 83.0mm × 2.2mm.
- FPC connector — verify the multi-pin FPC.
This module is an excellent choice for industrial control panels, smart home devices, and any embedded application requiring a compact, high-resolution display with flexible interface options.
