WM331 Camera Encoder board
Function
Variants
Parts
Programming
External interfaces
Service interfaces
Board view
Schematics
Contains Ambarella pipeline - the SoC, its external RAM and Flash memory and power regulators. This pipeline is responsible for receiving data from Camera Sensor and compressing it for SD-card storage. It also prepares another video stream, to be used for FPV.
The known variants are listed below.
| Marking | Overview |
|---|---|
| P01904.03 | First version. |
| Marking | Amt. | Pkg. | Function | Specification |
|---|---|---|---|---|
| Ambarella H1-A1-RH ??312 NE??????J 1N? H1S75 | 1 | BGA | Ultra HD 4K Camera SoC | |
| 7XLID NQ283 YCD6 | 1 | Micron NQ283 NAND | ||
| AFVJ 611 | 1 | |||
| WE245 TI 56K A9GV | 1 | 26-lead 6.3x4.3 PVQFN-N24 | SN74AVC8T245 8-Bit Dual-Supply Bus Transceiver With Configurable Voltage Translation and 3-State Outputs | description |
| ?NA | 1 | |||
| trig FAD | 1 | |||
| 8CB21 D9SRZ 2PYS / 8B847 B9SR2 2YKU | 2 | Micron MT52L256M32D1PF-107 WT:B; 8Gb lpDDR3-1866; RAM for Ambarella | description | |
| LZ | 1 |
| Chips | Firmware | Description |
|---|---|---|
| H1S75 | m0100, m0101 | Takes care of video encoding and controls firmware update process. Controls SD card slot. Consists of loader (01) and application (00). |
The board contains one connector:
| Marking | Overview |
|---|---|
| TODO |
The following service pads exist on this board:
| Marking | Overview |
|---|---|
| TODO |
Top of a P01904.03 board:
Bottom of the P01904.03 board:
flowchart LR
Gimbal-FFC-cable((FFC to<br/>Gimbal))
Gimbal-FFC-cable===Signal-Conditioner
Gimbal-FFC-cable-- UART<br/>DUML ---Ambarella-SoC
subgraph Camera Encoder board
Signal-Conditioner[Video input<br/>transceiver/<br/>conditioner]
Ambarella-SoC[Ambarella A9<br/>Camera SoC<br/>2x ARM and DSP]
Ambarella-Xlat(quartz<br/>oscillator)---Ambarella-SoC
Ambarella-SoC---Ambarella-RAM[lpDDR2<br/>SDRAM<br/>2GB]
Ambarella-SoC---Ambarella-FLASH[NAND<br/>Flash]
Encoder-CryptoAuth[ATSHA204<br/>Crypto<br/>Auth]
Signal-Conditioner== image<br/>sensor<br/>data ===Ambarella-SoC
Encoder-CryptoAuth---Ambarella-SoC
end
Interboard-SD-Pwr((inter-<br/>board conn<br/>to SD&Pwr))
FFC-3in1((FFC to<br/>3-in-1))
Ambarella-SoC-- UART<br/>DUML ---FFC-3in1
Ambarella-SoC== low bit rate<br/>video stream ====FFC-3in1
Ambarella-SoC== high bit rate<br/>video & photo ====Interboard-SD-Pwr
Ambarella-SoC-- usb ----Interboard-SD-Pwr
Thick lines present propagation of video data. The video comes from sensor board through Flex Film Cable. To push such high data rate through the cable without degradation, signal conditioner in required. Then the sensor data goes to Ambarella, which is the central SoC for video data processing. It applies proper filtering to the data, then generates two streams out of it - high bandwidth stream is H.274 compressed and written to SD-card (if recording) on Gimbal Power and SD board, low bandwidth stream is sent to Receiver Main Processor 3-in-1 board.
Ambarella requires external RAM and NAND chips, and quartz oscillator for clock signal generation. The SoC also has access to CryptoAuth engine, which it can use to encrypt or decrypt a secret storage block, which contains encryption keys.
No schematics available.