CECport CEK8902-S905D3 Firefly Workshop User Guide
Product Introduction
Firefly Workshop CEK8902 – S905D3 system board, a kind of intelligent hardware, is widely applicable to educational suite, face recognition, smart display terminal, video terminals, industrial automation terminal products, etc., including advertising machine, digital signage, intelligent self-service terminals, intelligent retail terminals, smart home devices, O2O intelligent equipment, industrial control hosts, and robots. CEK8902-S905D3 open source hardware adopts Amlogic® S905D3，quad core ARM Cortex-A55 CPU，with built-in Buildroot Linux, Ubuntu20.04, Android9.0 system. The core frequency is up to 1.9GHz. Its ARM G31 MP2 GPU supports 1080P video encoding and H.264 hard decoding. It has multi-channel video output. There is a specific interface on the board , which supports a number of peripheral expansion. It is your best choice regarding human-computer interaction and industrial control projects.
Product Features
- Compatible with most Raspberry PI 4B peripherals.
- Supports dual screen display, dual screen co-display.
- Supports customization for Linux and Android systems.
- The System API reference code is provided.
- Perfectly supports the development of client application programs. 3．Physical Specifications
Physical Product
Product Size
CEK8902-S905D3 open source main board adopts 6-layer PCB design, and the dimensions are shown below. The screw hole specifications are as follows: Φ2.5mm x 4.
The Performance Parameters
| Parameters | Description |
| CPU | Amlogic® S905D3 A55*4 |
| NPU | 1.2 TOPS |
| GPU | Mali G31 MP2 |
| Memory | LPDDR4 2GB（2/4GB optional） |
| Storage | EMMC 5.1 16GB（8/16/32GB optional） |
| Power Management | Discrete power supply design |
| Keys | N/A |
| Working Voltage | 5V 3A or above |
| Supported Systems | Ubuntu20.04/Android9.0/Buildroot Linux |
| Operating Temperature | 0 ~ 70 ℃ |
Interface Description
| Interface | Description |
| USB HOST | 5 x USB interface: (1 x Type-C OTG, 3 x USB2.0, 1 x USB3.0) |
| UART | 1 x TTL UART |
| MIPI DSI display | 2 lane, Compatible with raspberry pie 4.3 inch capacitive touch screen |
| MIPI CSI input | 2 lane MIPI-CSI camera interface |
| HDMI display output | 1 x Micro HDMI2.1 port，supports up to 4K x 2K @60fps |
| Eth | 1 x 10M/100M/1000M |
| Audio & Video | 1 x 3.5mm headset interface + 1 x CVBS |
| WIFI | 1T1R 2.4G + 5G WIFI |
| Bluetooth | 1 x 2.4G BT4.2 |
| The output power | 2 extension connector pins, one for 3.3V, the other for 5V |
| 40-Pins Header | 2.54mm spacing, compatible with Raspberry PI |
| TF Card | Supports TF Card |
| System upgrade | Supports local USB upgrade |
Schematic Diagram of 40 Extension Pins
| 3.3V PWR | 1 | 2 | 5V PWR |
| I2C_SDA | 3 | 4 | 5V PWR |
| I2C_SCL | 5 | 6 | GND |
| GPIOA_8 | 7 | 8 | UART-TX |
| GND | 9 | 10 | UART-RX |
| GPIOAO_7 | 11 | 12 | GPIOA_5 |
| GPIOAO_9 | 13 | 14 | GND |
| GPIOAO_8 | 15 | 16 | GPIOH_8 |
| 3.3V PWR | 17 | 18 | GPIOA_3 |
| SPI_B_MOSI | 19 | 20 | GND |
| SPI_B_MISO | 21 | 22 | ADC_CH3 |
| SPI_B_SCLK | 23 | 24 | SPI_B_SS0 |
| GND | 25 | 26 | GPIOE_2 |
| I2C_SDA1 | 27 | 28 | I2C_SCL1 |
| GPIOA_2 | 29 | 30 | GND |
| ADC_CH2 | 31 | 32 | GPIOA_4 |
| GPIOAO_5 | 33 | 34 | GND |
| GPIOAO_10 | 35 | 36 | ADC_CH0 |
| GPIOA_7 | 37 | 38 | GPIOA_0 |
| GND | 39 | 40 | GPIOC_7 |
PRECAUTIONS FOR USE
During usage, in order to avoid failure or causing damage to the product, please pay attention to the following (including but not limited to):
- Do not expose the bare board to water, moisture, or short circuit with peripherals during operation.
- During installation and mounting, avoid deformation of the bare board caused by mounting.
- Handle with care to avoid mechanical or electrical damage to the circuit board and connectors.
- When installing peripherals (USB/IO/UART), pay attention to peripheral IO level and current output.
- When installing the serial port, do not directly connect to the RS232 or RS485 device. Check whether the TX or RX connection setup is correct.
- Check whether the input power supply is connected to the Type-C port for power input. Check whether the input voltage and current meet the requirements, considering all the peripherals presently running on the board.
Appendix：Product Comparison
| Firefly Workshop CEK8902-S905D3 | Raspberry PI 4B | ||
| Main chip | Amlogic S905D3 | Broadcom BCM2711 | Domestic chip,no supply issue |
| Process | 12nm | 28nm | |
| CPU | Quad core Arm Cortex-A55, 1.9GHz | Quad core ARM Cortex-A72, 1.5GHz | |
| GPU | ARM Mali G31 MP2 800MHz | VideoCore VI 500MHz | |
| NPU | 1.2 TOPS INT8 | — | |
| Decode | 4Kx2K@60fps H.265 | H.265 4K 60fps | |
| Encode | H.265 1080P@60fpsH.264 1080P@30fps | H.264 1080P@30fps | |
| RAM | 2GB，32bit | 2GB，32bit | |
| ROM | 16GB | – | |
| MIPI-CSI | 2 lane | 2 lane | |
| MIPI-DSI | 2 lane | 2 lane | |
| WIFI | 1T1R 802.11 ac | 1T1R 802.11 ac | |
| BT | V4.2 | V5.0 | |
| SD Card | x1 | x1 | |
| HDMI | x1 | micro x2 | |
| USB2.0 | x3 + x1 USB-C OTG | x2 | |
| USB3.0 | x1 | x2 | |
| GigabitEth | x1 | x1 | |
| GPIOs | 28 | 28 | |
| OS | Linux & Android | Linux |
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. The device has been evaluated to meet general RF exposure requirement. This quipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body
Documents / Resources
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CECport CEK8902-S905D3 Firefly Workshop [pdf] User Guide CEK8902, 2BAK5-CEK8902, 2BAK5CEK8902, CEK8902-S905D3 Firefly Workshop, Firefly Workshop, Workshop |
