feeltech: DDS Function Generator FY6900: Teardown review |
Jose Mesquita
![]() Esquemas: 281 Fotos: 1461 19.Nov.20 16:35 Agradecimientos totales: 4 |
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This series of FY6900 signal generators were announced by FeelElec around 2019 on eevblog and this model toghether with the previous FY6600 are probably the most dissected and discussed SigGen in the forums for the good (low price, good specs, diy mods) and bad (questionable fiability, bugs and the infamous 4nS jitter) reasons. FeelElec has announced this model as an upgrade of the FY6600 series where features like MagicPulse Technology with Low Jitter(RMS)<200ps, more than 100 Waveforms: 8192 points * 14bits, and 0~24Vpp output amplitude range,with minimum resolution of 1mV. This FY6900 consists of these main assemblies: The Power Supply, the Main PCB (Signal Board), and the Front Panel PCB (MCU Board). The Switching Power Supply may be adequate to support the requitred current consumption of the +5V and +13.5V and -13.5V, but it is probably the weakest part of the unit. There are at least two Signal Board PCB revisions: V1.8 and V1.9, where the V1.8 still used the Altera Cyclone 4 FPGA, and V1.9 started to use a FeelElec-PRO 1941 FPGA and a Fan power supply header was included (despite no Fan is supplied up to Nov-2020). There are also two known PCB revisions for the MCU Board, V1.8 (that goes with Signal Board V1.8), and V1.91 (That goes with Signal Board V1.9). The known firmware releases are 1.2, 1.3 (around Nov-2019), and 1.4 (around Oct-2020). The management firmware is selfcontained inside the Front panel MCU Board MCU IC (STM32F103C8 ARM Cortex-M3 32-bit MCU 64KB Flash). Howeve the signal shaping firmware for the FPGA is contained inside a Winbond 25Q16JVS10 Flash ROM IC in the Main PCB Signal Board. FeelElec reports that firmware upgrades are done at the factory only (they can sell the two ICs (MCU and Winbond Flash) for those able to use a solder iron). That said, some customers have reported that they were able to update the firmware online by using the PC Software v6.5 (FY6900 remote control software) by installing the available PC Software V6.3 from FeelElec website, then do a online update to 6.5, and finally updating the firmware from 1.3 to 1.4 (firmware below 1.3 do not support online updates), but FeelElec has reported that this method was in beta testing and should not be used until the PC Software 6.5 is stable to be officially released on their website (this was the response from my AliExpress seller yesterday, Nov-18, 2020). Some anomalies were reported on the forums, like:
FY6900 Parts list Front Panel PCB V1.91 (Managemnent Board) U1 STM32F103C8 ARM Cortex-M3 32-bit MCU 64KB Flash Note on JK1: It could be used to connect the MCU to an external programmer like the "ST-Link V2 programmer" to R/W the STM32 MCU Flash memory. Main PCB V1.9 (Signal Board) U2 FeelElec-PRO 1941 FPGA
Este artículo fue corregido 19.Nov.20 16:43 por Jose Mesquita . |