The ASDX sensor of Honeywell exist in many variations. Check the datasheet of your type for all the details. The I2C_ASDX library can read the sensor and give the pressure in millibar, bar or PSI or ...
PCF8591 has one 8 bit ADC on board for 4 channels. The ADC is 8 bit and quite fast. At 100 KHz one gets more than 2000 reads per second for read() and more than 2000 writes per second for write().
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