YiXingDianZi MDSO¶


Status	supported
Source code	hantek-6xxx
Channels	2
Samplerate	48MHz
Analog bandwidth	20MHz
Vertical resolution	8bit
Triggers	none (SW-only)
Input impedance	1MΩ‖25pF
Memory	none
Display	none
Connectivity	USB

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:

(AD9288 D5B) PD5	1-	O	-56
(AD9288 D6B) PD6	2-	-55	PD3 (AD9288 D3B)
(AD9288 D7B) PD7	3-	-54	PD2 (AD9288 D2B)
GND	4-	-53	PD1 (AD9288 D1B)
CLKOUT	5-	-52	PD0 (AD9288 D0B)
VCC	6-	-51	*WAKEUP
GND	7-	-50	VCC
RDY0/*SLRD	8-	-49	RESET#
RDY1/*SLWR	9-	-48	GND
AVCC	10-	-47	PA7
(24MHz crystal) XTALOUT	11-	-46	PA6 (CH2 74HC4051 S2)
(24MHz crystal) XTALIN	12-	-45	PA5 (CH2 74HC4051 S1)
AGND	13-	-44	PA4 (CH2 74HC4051 S0)
AVCC	14-	-43	PA3 (CH1 74HC4051 S2)
(USB D+) DPLUS	15-	-42	PA2 (CH1 74HC4051 S1)
(USB D-) DMINUS	16-	-41	PA1 (CH1 74HC4051 S0)
AGND	17-	-40	PA0
VCC	18-	-39	VCC
GND	19-	-38	CTL2
(FX2 CTL0) (AD9288 ENCA/B) *IFCLK	20-	-37	CTL1
RESERVED	21-	-36	CTL0 (AD9288 ENCA/B) (FX2 IFCLK)
(EEPROM SCL) SCL	22-	-35	GND
(EEPROM SDA) SDA	23-	-34	VCC
VCC	24-	-33	GND
(AD9288 D0A) PB0	25-	-32	PB7 (AD9288 D7A)
(AD9288 D1A) PB1	26-	-31	PB6 (AD9288 D6A)
(AD9288 D2A) PB2	27-	-30	PB5 (AD9288 D5A)
(AD9288 D3A) PB3	28-	-29	PB4 (AD9288 D4A)

ST 74HC4051 (upper/lower, CH1/CH2) pinout:

CH1 (U13)	CH2 (U10)
Y4	1-
Y6	2-
(AD8065 -in, via 1k to GND) Z	3-
Y7	4-
Y5	5-
(GND) E#	6-
VEE	7-
GND	8-

Y4	1-	O	-16
Y6	2-	-15	Y2 (AD8065 out)
(AD8065 -in, via 1k to GND) Z	3-	-14	Y1 (AD8065 out via 1k)
Y7	4-	-13	Y0 (AD8065 out via 3.9k)
Y5	5-	-12	Y3 (AD8065 out via 15k)
(GND) E#	6-	-11	S0 (FX2 PA4)
VEE	7-	-10	S1 (FX2 PA5)
GND	8-	-9	S2 (FX2 PA6)

Input stage gain:

S1	S0	74HC4051D Mux	Gain	VDIVs
0	0	Y0 to Z (3.9k)	5 (4.9 in fact)	200mV
0	1	Y1 to Z (1k)	2	500mV
1	0	Y2 to Z (0)	1	1V
1	1	Y3 to Z (15k)	16	62.5mV

Microchip 24LC64I pinout:

(VCC) A0	1-	O	-8
(GND) A1	2-	-7	WP (GND)
(GND) A2	3-	-6	SCL (FX2 SCL)
VSS	4-	-5	SDA (FX2 SDA)

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").
AINA, AINB	Analog input channels.
D0A-D7A	Connected to FX2 PB0-PB7.
D0B-D7B	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.