hi there, just read here:->
„it seems that there is already an MCU fitted (ST’s STM 8S103F3) programmed to allow access to some of the es9028 internal hardware functions (volume etc)…“
guess on the „newer“ ES9028Q2M´s (layout „2017 04 09“) there is this STM 8S103F3 and there is also a 4 pin header (5V+, SWIM,GND, Reset) to program/read out them..(SWIM-interface)
so, now is the question if someone has ever read out that eeprom (on these boards) or re-programed (and with what ?)..
any comments here concerning this topic are really,really appreciated !!
(SWIM->ST-Link-Raspberry Pi->http://kuku.eu.org/?projects/stm8spi/stm8spi )
This product is finished board, using the latest audio DAC ES9038 Q2M as the core design, comprehensive deep software control optimization, PCM DSD switch no sonic, 3 groups of inputs can be simultaneously access, jumper smooth switch
Product features are as follows:
1. Onboard MCU MCU, used as a pure IIS / DSD input DAC board
2. Support coaxial and fiber input, support PCM44.1Khz-192Khz / DSD64 hard solution
3. Onboard to provide volume control interface, connect a single 10KR or so potentiometer that can achieve volume control.
4.ES9038Q2M better than the previous generation ES9028Q2M sound, thicker thick flow, direct support for coaxial fiber DOP, DSD direct solution, 129dB DNR -120dB THD + N quite excellent.
5. With the board default 5532DD op amp, use the transport seat to facilitate the customer to upgrade the fever of the op amp
6. The use of imported high-precision active crystal
7. The use of high-quality gold-plated RCA, metal shield headphone output interface
8. Carrier signal lock indicator and DSD signal indicator
Coaxial: PCM44.1K-192K 24BIT / DOP DSD64
Fiber: PCM44.1K-192K 24BIT / DOP DSD64
IIS / DSD: PCM44.1K-384K 32BIT / DSD64, DSD128, DSD256
Output: Dual-channel single-ended RCA output, 3.5 headphone monitor output
Power supply: regulated DC voltage double 15V or regulated DC voltage single 15V
* It is recommended to use dual 15V power supply to play board best results
(more information also here (about the chip)->http://bbs.hifidiy.net/thread-1257220-1-1.html)