SLASEC8B February 2017 – January 2019 PGA460-Q1
Similarly to time decoupling, a temperature-decoupling function has been implemented in the PGA460-Q1 device that can connect and disconnect a temperature-compensation capacitor at a certain temperature point to compensate for the temperature nonlinearity of the transducer. By using this function, the transducer frequency is assumed to remain within limits across temperature. To enable this function, the DECPL_TEMP_SEL bit must be set to 1.
Upon receiving a run command, the PGA460-Q1 device executes the TEMPERATURE MEASUREMENT command first and compares the result with the temperature setting defined by the DECPL_T bit in the EEPROM. If the temperature measured is higher than the value based on the DECPL_T bit, then the DECPL pin is low (GND) causing the QDECPL transistor to be disabled and the temperature compensation capacitor to disconnect. If the measured temperature is less than the value based on the DECPL_T bit, the DECPL pin is high (3.3 V or 5 V depending on the IOREG level), the QDECPL transistor is enabled and the temperature compensation capacitor is connected to the circuit. Figure 40 shows the circuit implementation.