YiXingDianZi MDSO
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The YiXingDianZi MDSO (also known as Wosontel MDSO) is a USB-based, 2-channel oscilloscope with an analog bandwidth of 20MS/s and 48MS/s sampling rate.
It comes in very compact plastic case (82x65x23mm) without any branding, USB type B input, 2c BNC inputs, and a red LED.
The YiXingDianZi manufacturer is probably the same as Instrustar (Chinese characters match, lsusb is almost exactly the same).
See YiXingDianZi MDSO/Info for more details (such as lsusb -v output) on the device.
Hardware
- Cypress FX2LP CY7C68013A-56PVXC (USB 2.0 HS controller)
- ADC: Analog Devices AD9288
- EEPROM: Microchip 24LC64I (64K I²C EEPROM)
- 2x ST 74HC4051 (8-Channel analog mux)
- Crystal oscillator 24MHz (crystal)
- 4x 145 MHz FastFET op amp: Analog Devices AD8065 (top markings HRA)
- Unmarked DC/DC converter
- 3.3V LDO: AMS1117-3.3
Cypress FX2 pinout:
ST 74HC4051 (upper/lower, CH1/CH2) pinout:
| | |CH1 (U13)|CH2 (U10)| |||
Input stage gain: | | |S2|S1|S0|74HC4051D Mux|Gain|VDIVs| |0|0|0|Y0 to Z (3.9k)|5 (4.9 in fact)|200mV| |0|0|1|Y1 to Z (1k)|2|500mV| |0|1|0|Y2 to Z (0)|1|1V| |0|1|1|Y3 to Z (15k)|16|62.5mV|
Microchip 24LC64I pinout:
Analog Devices AD9288 pinout: | | |AD9288 pins|Description| |S1, S2|S1=VCC, S2=GND. "Normal operation, data align disabled".| |DFS|Tied to GND. Data format select = "offset binary" (not "twos complement").| |A~IN~A, A~IN~B|Analog input channels.| |D0~A~-D7~A~|Connected to FX2 PB0-PB7.| |D0~B~-D7~B~|Connected to FX2 PD0-PD7.|
Firmware
Note: The firmware is flashed into the device permanently.
EEPROM layout
The device has a 8KB I²C EEPROM with the following layout:
c2 47 05 31 21 00 00 04 XX XX XX XX XX XX .. ..
Description:
| Bytes | Description |
|---|---|
| 0 | 0xc2: FX2 "c2 load" mode, i.e. VID/PID/DID are loaded from EEPROM as the firmware. |
| 1-2 | 0x0547: USB vendor ID (VID before firmware renumerate). |
| 3-4 | 0x2131: USB product ID (PID before firmware renumerate). |
| 5-6 | 0x0000: USB device ID (DID before firmware renumerate). |
| 7 | 0x04: FX2 configuration byte (see FX2 TRM for details). |
| 8-1917h | Firmware. |
| 1918h -1fffh | All-0xff. |
Photos
Packaging
Device, top
Inside
PCB, top
PCB, bottom
PCB, USB side
PCB, analog frontend