FORENEX FES4335U1-35C TFT-LCD Graphics Control Module User Guide
- June 9, 2024
- FORENEX
Table of Contents
FES4335U1-35C
TFT-LCD
Graphics Control Module
(Memory Mapping)
Interface: UART
Reference Manual (Preliminary) Document No: doc-fes4335U1-35C-v11
PCB Bare Board: PB35C62-V11
| Approved By | Checked By | Prepared By |
|---|
FES4335U1-35C TFT-LCD Graphics Control Module
Revision histories
| Rev. No. | Date | Substantial Changes |
|---|---|---|
| 1 | 2017/01 | First issue. |
| 1.1 | 2022/02 | 1.Update communication option 1/2/3 |
| 2.Showing FR-DCE and FR-E2S board |
General Description
FES4335U1-35C is a low cost, high efficiency and smart of TFT-LCD display
control module which can provide characters or 2D graphics application within
an embedded 768KB of display RAM.
FES4335U1-35C offers serial interface (UART-TTL) to establish a hardware
communication with an external simple MCU (as like 8051 etc.), and providing
the “Commands Table” for graphical effect calling and execution.
According to the “Commands Table” of graphics APIs, the external MCU only need
to transmit the corresponding command code with parameters into FES4335U1-35C
over serial interface. The command decoder inside of FES4335U1-35C would go to
implement the graphics task by automatically.
| Item | Specification | Remark |
|---|---|---|
| LCD size | 3.5 (Diagonal) | inch |
| Resolution | 320 x 3(RGB) x 240 | dot |
| Color arrangement | 64k colors w/ RGB-stripe | |
| Display type | Normally White. Transmissive type | |
| Active area | 70.08(W) x 52.56(H) | mm |
| Module size | 84.02(W) x 75.36(H) x 12.8(D) | mm |
| View angle | L:60/ R:60/ T:60/ B:60 | θ |
| Contrast ratio | Typ. 600 @ (θ=0°) | CR |
| Backlight type | Build-in LED driver | |
| Brightness(Luminance) | Typ. 800 | cd/m² |
| Touch type | PCAP | |
| Interface | UART, 115200/ N/ 8/ 1 | |
| Software offer | Fornax’s Free editing tool | Note1 |
| Flash ROM for images storage | (Typ.)8MB/16MB | |
| Full screen image capacity | 36 pages (8MB)/ 72 pages (16MB) | |
| Picture switching speed | About 18ms/frame | |
| Picture downloading | FG875D_Command_Encoder.exe | |
| Operation Temp | -20℃ to 70℃ | |
| Storage Temp | -30℃ to 80℃ |
Note1: The Fornax’s Free editing tool that (FG875D_Command_Encoder.exe) is a windows app. In the utility, all of usable APIs that summarized in command Table can be selected and auto-encoding. Refer to document (FG875D_Commands Table_vx.pdf) and (FG4335x_software_Note_V1.pdf) for detail usage description for each command.
Pin Assignment
UART Input interface (W1)
Connector on board (W1): Wafer_4pin/ 1.25mm/ side entry
Connector Matching Suggest: Molex 51021 or compliant
Pin num| Description| I/O| Note
Pin1| VCC| | DC5V
Pin2| TX| O|
Pin3| RX| I|
Pin4| GND| |
GPIO interface (W3)
Connector on board (W3): Wafer_4pin/ 1.25mm/ side entry
Connector Matching Suggest: Molex 51021 or compliant
Pin num| Description| I/O| Note
Pin1| GPI 0| I| 2
Pin2| GPI 1| I| 2
Pin3| GPI 2| I| 2
Pin4| GPI 3| I| 2
Pin5| GPO 0| O| 3
Pin6| GPO 1| O| 3
Pin7| GPO 2| O| 3
Pin8| GPO 3| O| 3
Pin9| GND| |
NOTE2: The GPO_0 ~ 3 are output with a series resister 100 Ohm.
NOTE3: The GPI_0 ~ 3 are 3.3V input with 5V tolerant.
Operation Specifications
Electrical specifications
Absolute Maximum Ratings
| Item | Symbol | Min. | Max. | Unit | Note |
|---|---|---|---|---|---|
| Power Voltage | VCC | -0.3 | 5.2 | V | |
| Operating Temperature | TOP | -20 | 70 | ℃ | |
| Storage Temperature | TST | -30 | 80 | ℃ |
- The absolute maximum rating values of this product are not allowed to be exceeded at any times.
Recommended operating condition
Symbol| Description| Min.| Typ.| Max.| Unit|
Note
---|---|---|---|---|---|---
VCC| Supply voltage| 5.| 5| 5.| V|
l(vcc)| Supply Current| | 200| 220| mA|
UART-(Tx/Rx),GPIOs signal level
VIH| Input High Voltage| 2| 3.| 5| V|
VIL| Input Low Voltage| 0.| | 0.8| V|
VOH| Output High Voltage| 2.| | | V|
VOL| Output Low Voltage| | | 0.4| V|
Ileak| Input Leakage Current| -10| | 10| uA|
Optical Specifications (0=01
CR| Contrast Ratio| 500| 600| | |
L| Luminance| 700| 800| 850| cd/m2|
Power consumption @ 5v input, 100% brightness
Consumption| 3.5″ , 320×240| 1.| W|
Mechanical specification
Hardware specification
Block Diagram
Figure 3-a : The Block Diagram of FES4335U1-xxC
Serial communication option (1/2/3)
Baud Rate: be fixed at 115200 bps/N/8/1.
Option 1: By 3-wire UART (TX, RX, GND).
Option2 : By RS232 with an external board FR-DCE (UART to RS232
converter)
Option3 : By Ethernet with an external board FR-E2S (UART to Ethernet converter)
Software
Communication (handshaking)
Due to the serial interfaces (UART) those FES4335U1 series have offer to
establish a communication with an external host. The host is able to transmit
a command stream to FES4335U1 for a task implementation asking.
According to the capacity of transmission, the command stream format is simply
defined into two categories.
- Standard Command Stream: This is an essential command stream format for each one task which is listed in the Commands Table. (Refer to FG875D_Commands Table_vx.pdf).
- Bulk Data Transmission Stream: Only provide to some tasks will ask for a bulk data transmission, and the asking has confirmed during the standard command stream stage.
Currently only below two tasks which will ask for a Bulk Data Transmission protocol.
1). FG875D_WriteToSerialROM (function code 0x21).
2). FG875D_Display_Block_RW (function code 0x24).
According to the Commands Table, each command has a unique function code for a
specific operation task.
Therefore, once the FES4335U1 has received a complete of Standard Command
Stream and which part of checksum is checked firstly. After that, the part of
function code would be identified and implemented along with parameters part.
There are a specifically code area 0x50~0x5F where will dedicate to define
some message code and also be isolated from the all of function code.
| Return message code | ASCII | hex | Description |
|---|---|---|---|
| Wrong code | X | 0x58 | Checksum error |
| Waiting code | W | 0x57 | FES4335 is busy |
| Ready code | S | 0x53 | FES4335 is ready |
| Timeout code | T | 0x54 | Receive Timeout |
| Touch Interrupt code | P” | 0x50 | Touch panel has been touched |
| Command success code | Function code | Command implement success | |
| Bulk transmission success code | 0x55,0xAA | Bulk data transmission success |
• If there is no error encountered during transmission.
The FES4335U1 will implement command according to function code that has
received in Standard Command Stream Stage, and return function code to Host
for success checking.
or
Return function code (0x55,0xAA) to indicate this time of Bulk Data
Transmission has completed without problem in “Bulk Data Transmission stage”.
- Return Success code or (0x55,0xAA), informing a success status.
| Standard Command Stream success
Bulk Data Transmission success
---|---
Host could send next new command stream.
• If there is any unexpected condition has encountered during
transmission.
The FES4335 will return a corresponding error code message and along with the
received function code for error checking.
- If return Wrong code (0x58) like below. (indicate a Checksum error has occurred)
| Standard Command Stream stage error
Bulk Data Transmission stage error
---|---
Host should repeat the previously command stream.
- If return Timeout code (0x54) like below, (indicate a Timeout error has occurred)
| Standard Command Stream stage error
Bulk Data Transmission stage error
---|---
Host should repeat the previously command stream.
- Return Wait code (0x57) like below, (indicate a wait status has occurred)
| Standard Command Stream is Busy
Bulk Data Transmission is Busy
---|---
To inform host that FES4335U1 is in a busy status. Host should temporary stop transmission until FES4335U1 return Ready code (0x53) and then continue the command stream or bulk data stream those do not finish data yet.
- Return Ready code (0x53) like below, (indicate a ready message has occurred)
| Standard Command Stream is Ready
Bulk Data Transmission is Ready
---|---
To inform host that FES4335U1 has released from the period of busy status. The Host can continue the rest of command stream or bulk data stream.
• A specific code to inform the touch interrupt has occurred and also would return the coordinate (x,y) value of touch panel automatically.
- Return Touch interrupt code (0x50) with coordinate (x,y) value like below,
a. In a bulk data transmission stage, the FES4335U1 will temporary to disable
touch function and stop return the coordinate (x,y) of touch.
b. Out of a bulk data transmission stage. FES4335U1 would automatically return
the coordinate (x,y) of touch when a touch interrupt has occurred.
c. Host could also to poll the coordinate (x,y) value by sending Function code
0x03 (APIs:FG875D_Detect_Touch).
Command (Stream /Format /protocol)
Standard Command Stream
• Format: This format combines a byte of function code and several
parameter bytes and a byte of checksum code.
• Protocol:
Bulk Data Transmission
Since the function code in Standard Command Stream is (0x21) or (0x24) that
will ask a bulk data transmission task after those function code have be
identified by FES4335U1.
In this case, the whole communication process will be separated into two
stages (Standard Command Stream stage + Bulk Data Transmission protocol
stage).
• Format: This format is available for bulk data transmission stage only.
The leading code (0x55,0xAA) will replace function code to indicate a Bulk
Data Transmission beginning and then the value be set into length byte is
indicated how many data byte will comes up in continuously. Notice to set
length byte with real data quantity minus 1.
• Protocol:
The illustration to show the standard command stream which ask to write a bulk
data transmission to FES4335U1.
The illustration to show the standard command stream which ask to read a bulk data transmission from FES4335U1.
Appendix (Tips):
Three steps to show a still images on screen more quickly.
Step1): Converting image to a .bin file:
Due to the FES4335U1’s Flash-ROM that only accepts (.bin) file of image.
Therefore, firstly to use the utility FES87x_Image_Tool.exe that able convert
the (.BMP/.JPG) file into (.BIN) file. Refer to
document〝FES87x_Image_Tool_User_Guide_v1.0.pdf〞for detail.
Step2): Loading .bin file to the internal SPI-Flash ROM(AMIC A25LQ64).
- Using the function code 0x21 (APIs:FG875D_WriteToSerialROM) to require FES4335U1 to go into the bulk data transmission stage.
- After the Command success code(0x21) is returned from FES4335U1, then external MPU be allowed to transmit images according to the protocol description about the bulk data-(write) transmission on section 4-2-2. Refer to figure (2).
- Another way to skip ① & ②:
On PC side, to execute utility software (FG875D_command_encoder.exe) that is a useful free tool from Foreknew. and choose function item (FG875D_WriteToSerialROM) in selection dialog. After then, the utility software will take care all about communication protocol and uploading image file into SPI-Flash ROM.
Regarding to the usage of utility software (FG875D_command_encoder.exe), please refer to document “FG875D_Command_Encoder-UsersMenu.pdf”.
Step3): Using the function code 0x22 (APIs: FG875D_DisplayIMGFromSerialROM) to require FES4335 to display images from internal SPI Flash ROM to an indicated location of panel.
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