This article brings you a summary of ads1256 Chinese data.
ADS1256 module description1. The analog voltage of ADS1256 chip is 5V, the digital voltage is 3.3V, so the module needs to supply 5V in the upper left corner, and the power supply needs less ripple. The 3.3V digital voltage is generated by the AMS1117-3.3 chip on the module, eliminating the need to connect 3.3V.
2, the chip is digital IO port D0-D3 all lead, if you need to connect and debug. 3. The 3.3V voltage output is generated by the module AMS1117-3.3 chip, which can supply power to the external MCU.
4. The control port of the chip that needs to be connected to the MCU is all taken out, and the connection is configured according to the test program during the test. This place explains: The microcontroller needs to be 3.3V level.
5. The 5V voltage output in the upper left corner is generated by the 5V external power supply through the module filter circuit, which can supply power to the external sensor.
6. The reference voltage chip is REF3125. The fixed output is 2.5V. The current is about 50uA. Only the reference voltage test point of the module can be used. It cannot be used for external power supply.
The 7 and 8 analog inputs are the voltage input points to be measured and can be programmed into separate input mode or differential input mode. After the analog signal is input, it is sent to the chip through the RC filter on the module. The RC filter is low-pass filtered, and the pass frequency is about 300HZ. If you want to increase the pass frequency, you can modify the RC value.
8, the module's default analog input voltage is -5V---+5V, if you want to test a higher voltage, you can solder the voltage divider resistor at the input, detailed solder joint reference circuit diagram.
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