Square TFT Display 4 Inch SPI&MCU 320x320 Dots Product
Introduction
SAEF TECHNOLOGY SF-TO400DX-8979A-CT TFT LCD display module is a transmissive type color active matrix
TFT(Thin Film Transistor) liquid crystal display (LCD) that uses
amorphous silicon TFT as a switching device. This module is
composed of a TFT LCD module, a driver circuit, and a back-light
unit. the resolution of a 4” contains 320 (RGB)X 320 dots, and it
can display up to 262k color. SF-TO400DX-8979A-CT TFT LCD model supports MCU and SPI interface; the supply voltage
(VCC) of driving LCD panel is from is 2.7V to 3.6V. Typical value
is 3.3V.
SF-TO400DX-8979A-CT can be operating at temperatures from -20℃ to +70℃; its storage
temperatures range from -30℃ to +80℃. the LCD module is with PCAP
capacitive touch screen, It is great for automation, GPS, medical
equipment, industrial device, security equipment white goods, smart
home applications, IoT System, car equipment, car dashboard, car
audio, car clock, car door display system, water ionizer, which
requires TFT display in high quality and colorful image.
Product Features:
| Product: | TFT 4″ Inch |
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| Resolution: | 320X320 Pixels |
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| Interface: | MCU SPI |
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| Touch Screen: | With PCAP Capacitive Touch Screen |
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| Outline Dimension: | 84.0(W) x 84.0 (H) x 3.37 (T) mm (with touch) |
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| Viewing Direction: | All Viewing Angles (85/85/85/85) |
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| Pin Number: | 40 Pins |
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| Connection: | Plugging |
|---|
| Surface Luminance: | 300 Cd/m2 |
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| Supply Power: | 3.3 V |
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| Current Consumption: | 20 mA |
|---|
| Operating Temp.: | -20℃ To +70℃ |
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| Life Time: | 40000 Hrs |
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| Compliance: | REACH & RoHS Compliant |
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Square TFT Display 4" SPI&MCU 320x320 Dots Product Drawing
Interface Pin Definition
| Pin No. | Symbol | Description | When not in use |
| 1 | LEDA | B/L positive pin | — |
| 2 | LEDK | B/L negative pin | — |
| 3 | LEDK | B/L negative pin | — |
| 4 | GND | Ground | — |
| 5 | VCI | Power supply(2.8-3.3V) | — |
| 6 | IOVCC | I/O power supply(1.8-3.3V) | — |
| 7 | TE | Tearing effect output | Open |
| 8 | CS | Chip selection pin. Low-active. | — |
| 9 | RS | Display data/command selection
DCX=’ 1’ : display data or parameter. DCX=’0’ : register index / command. | — |
| 10 | WR/SCK | Write enable in MCU interface. In SPI mode, this pin is sclk | — |
| 11 | RD | Read enable | GND |
| 12 | SDI | SPI interface input/output pin. | — |
| 13 | SDO | SPI interface output pin. | — |
| 14 | GND | Ground | — |
| 15-30 | D0-D15 | Horizontal sync input | GND |
| 31 | RESET | This signal will reset the device and it must be applied to
properly initialize the chip | — |
| 32 | IM2 | IM0=0 | IM2=0 | MCU 16 BIT | D[ 15:0] is used | — |
| IM0= 1 | IM2=0 | MCU 8 BIT | D[7:0] is used |
| 33 | IM0 | IM0= 1 | IM2= 1 | 4Line SPI | CS,RS,SCK.SDI | — |
| IM0=0 | IM2= 1 | Reserve | – |
| 34 | GND | Ground | — |
| 35 | TP_INT | TP Interrupt to the host | Open |
| 36 | TP_SDA | TP I2C data input and output | Open |
| 37 | TP_SCL | TP I2C clock input | Open |
| 38 | TP_RES | TP external reset, Low is active | Open |
| 39 | TP_VCI | TP power supply(2.8-3.3V) | Open |
| 40 | GND | Ground | — |
Backlight Electrical characteristics
| Item | Symbol | Min | Typical | Max. | Unit |
LED module forward
Voltage | VB LEDB | 12-13.2 | V |
| LED module current | IB LEDB | 30 | 40 | 50 | mA |
| LCM Surface brightness Luminance▼1 | LB SB | —– | 300 | —- | Cd/mP 2P |
| LCM Surface brightness uniform▼2 | LB DBBB | —- | 80 | —- | % |
LCD Electrical characteristics
| parameter | Symbol | Condition | Min | Typ | Max | Unit |
Viewing Angle | Φ=3 O’clock |
θ |
Cr＞10 | 75 | 85 | |
deg |
| Φ= 6 O’clock | 75 | 85 | |
| Φ=9 O’clock | 75 | 85 | |
| Φ=12 O’clock | 75 | 85 | |
| Contrast ratio | Cr | θ=0
Φ=0 | 800 | 1000 | | |
| Respone time | Tr+Tf | — | 25 | — | ms |
| NTSC | % | 55 | 60 | | |
| CIE(x,y) chromaticty | WHITE | X | θ=0
Φ=0 | Typ
-0.03 | 0.294 | Typ +0.03 | |
| Y | 0.329 | |
Reliability Test
| NO. | ITEM | CONDITION | Cr |
| 1 | High Temperature Non-Operating Test | 70℃*48Hrs | *No Defect Of Operational Function In Room Temperature Are Allowable. *IDD of LCM in Pre-and Post-test Should Follow Specification |
| 2 | Low Temperature Non-Operating Test | -20℃*48Hrs |
| 3 | High Temperature/Humidity Non-Operating Test | 50℃*90%RH*48Hrs |
| 4 | High Temperature Operating Test | 60℃*48Hrs |
| 5 | Low Temperature Operating Test | -10℃*48Hrs |
6 |
Thermal Shock Test | -10℃(30Min) -25℃(5Min) -60(30Min)*2 Cycles |
7 |
ESD test | Voltage:±6KV R: 330Ω C:150pF Air discharge, 10time |
Square TFT Display 4" SPI&MCU 320x320 Dots Product Image 
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