![]() ![]() Zero offset on ADC is strongly temperature dependent.Voltage Selector: the most reliable voltage selection is +/-20V, lower hardware voltages present strong non-linearity which make useless the full ADC range of the device (for example +/-500mV range is linear just in the range +500mV -> -80mV.Acquisition: on each scan acquire 4000 bytes (2000 samples) from 2 buffers (2000 samples each buffer).Drop down to 1.2MS/s if enable 2 channels. Sample rate: maximum measured 2.4MS/s if just 1 channel is enabled.A6 03 (acquire 64 bytes, 32 samples of 12 bits each, repeated 60 times get 2000 samples).A6 02 (acquire 64 bytes, 32 samples of 12 bits each, repeated 60 times get 2000 samples).Start of waiting cycle for data to be ready into the buffers F3 -> hardware ping (required to send regularly also when acquisition is stoped, otherwise the hardware disconnect).C1 00 00 for Channel 1, rising slope, C1 01 01 for Channel 2, falling slope) C1 -> set trigger source and slope (ie.AC 07 D0 00 03 42 00 03 42 set highest sampling rate for 2 channels enabled = 1.2MS/s) A2 -> set voltage level for each channel (ie.AA -> set which channel to enable (ie.A0 -> set number of channel enabled (ie. ![]() The device got logically disconnected automatically if not receive any command after 7 seconds. Need to continuously send commands to the OUT Endpoint, and for each command receive the result from the IN Endpoint (both Endpoints can transfer max 64 bytes). 1x TI 86 AVG (near IDC pin header, A0/A1 signals).8x NXP 74HC4051D, 8x TI 86 AVG (per analog channel).AMS1117-3.3 LDO plus (not identified) SMPS U427, no barrel jack, only USB-B.Ships with one high pressure ignition probe (inductive) Dual opamp: in MSOP-8 package, Texas Instruments unknown model (chip markings "TI 25 AVG") (1 per analog channel).8-bit shift register with 3-state output: 74HC595 (3 total).Octal 3-state buffer: Fairchild Semiconductor MM74HC244SJ (in the path of digital outputs).8-channel analog multiplexer/demultiplexer: NXP Semiconductor 74HCT4051D (1 per analog channel).Low-dropout voltage regulator: Advanced Monolithic Systems AMS1117-3.3. ![]()
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December 2022
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