An IEEE 1451 standard transducer interface chip
T. Cummins, D. Brannick, E. Byrne, B. O'Mara, H. Stapleton, J. Cleary, J. O'Riordan, Donal Lynch, L. Noonan, D. Dempsey · 2002
This IEEE 1451 standard chip integrates the key standard transducer interface module (STIM) elements with 12b 5 /spl mu/s conversion in a single device, enabling single-chip STIM implementation for applications requiring higher accuracy and/or faster conversion time such as battery monitoring, pressure and temperature measurement, gas monitoring and leak detection. The footprint and power of this single-chip implementation enable remote 4-20 mA loop-powered smart-transducer applications and co-mounting of the STIM and sensor. A low-complexity split-gate EEPROM cell and metal-poly capacitors with a calibration algorithm in the ADC are key elements in achieving this level of integration. A technique used in the DAC achieves 12b DNL in a small area, allowing integration of two DACs, eliminating the need to use valuable timer/counters for more traditional pulse-width-modulated (PWM) analog outputs.