Instrustar ISDS205A
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The Instrustar ISDS205A is a USB-based, 2-channel oscilloscope with an analog bandwidth of 20MS/s and 48MS/s sampling rate. Compared to products similar for boxing and price level it could be considered an enhanced version of FX2 oscilloscope, not in the boxing which appear to use worse materials, but in the hardware which allow a wider input range (from 0.09mVp to 6Vp) and an hardware AC/DC selector.
See Instrustar ISDS205A/Info for more details (such as lsusb -v output) on the device.
Hardware
- Cypress FX2LP CY7C68013AC (USB 2.0 HS controller)
- Analog Devices AD9288 (ADC)
- Microchip 24LC64I (64K I²C EEPROM)
- (2)NXP 74HC4051 (8-Channel Analog Mux)
- NXP 74HC595D (8bit Shift Register (Serial-in to Serial or Parallel-out)) (datasheet )
- Oscillator GZX24.000 (24MHz crystal)
- (4) Huike (Shenzhen) HK23F-DC5V-SHG (Reed switch)
Cypress FX2 pinout:
NXP 74HC595D pinout:
NXP 74HC4051D (upper/lower, CH1/CH2) pinout:
| | |||
Microchip 24LC64I pinout:
Analog Devices ADS9288 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
Device, top
Device, bottom
PCB, top
PCB, bottom
2x mux, ADC, shift-reg
(1 of 2) mux, ADC, shift-reg, USB, EEPROM, crystal
Jacks, reed switches, calibration. 2x mux, ADC, USB, crystal