ISL12022 RTC Accuracy Optimization Calibration Procedure ISL12022 RTC Accuracy Optimization Calibration Procedure Application Note May 6, 2008 AN1400.0 Introduction Temperature Sensor Real Time Clock (RTC) devices contain an oscillator and The embedded temperature sensor produces an analog normally require a crystal to operate with the required accuracy. voltage output, which is input to an A/D converter and Most commonly used 32.768kHz crystal oscillators have a ……