Abstract
Aiming at the weakness and diversity of the signal of nano-imprinting pressure and to meet the requirements of detection of IPC, a signal conditioning system and software was designed based on Max1452.The system achieved data exchange between IPC and conditioning circuit through RS232.Using data acquisition card to receive and control data acquisition circuit.The data chart was showed on the user interface based on VC++.Experiment showed that the system not only had comparatively high linearity,but was also easy to use.
Highlights
Max1452 normally operates in analog mode, if you want to program the chip, it must be changed to digital mode.Max1452 utilizes asynchronous serial communication to realize data exchange with the outside
All communication commands into the Max1452 follow a defined format utilizing an interface register set(ISR).The ISR is an 8-bit command that contains both an interface register set data(ISRD) nibble(4-bit) and an interface register set address(ISRA) nibble(4-bit).All internal calibration registers and EEPROM locations are accessed for read and write through this interface register set
Set the Max1452 values using the user interface according to the Figure. 8, an important thing you should remember is that you must set the Max1452 in digital mode by keeping the unlock pin high before reading or writing the registers of the chip
Summary
Max1452 is a highly integrated analog-sensor signal processor optimized for industrial and process control presure sensors that utilize piezo-resistive bridge Transducers. The fully analog signal path introduces no quantization noise in the output signal while enabling digitally controlled trimming with the integrated 16-bit DACs within ±.02%. The max1452 architecture includes a programmable sensor excitation, a 4-bit programmable-gain amplifier, output signal clip-level diagnostics, a 768-byte interal EEPROM, four 16-bit DACs, and an on-chip temperature sensor. The customer can select from 1 to 144 temperature points to compensate their sensor This allows the latitude to compensate a sensor with a simple first order linear correction or match an unusual temperature curve. By proggramming up to 114 independent 16-bit EEPROM locations to correct performance in 1.5°C temperature increments over a range of -40°C to 125°C.The Max1452 (Figure 1) provides an analog amplification path for the sensor signal. Data formats is always 1 start bit, 8 data bits, 1 stop bit and no parity
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