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IDT1339-31DVGI Datasheet(PDF) 3 Page - Integrated Device Technology |
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IDT1339-31DVGI Datasheet(HTML) 3 Page - Integrated Device Technology |
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3 / 26 page  IDT1339 REAL-TIME CLOCK WITH SERIAL I2C INTERFACE RTC IDT® REAL-TIME CLOCK WITH SERIAL I2C INTERFACE 3 IDT1339 REV S 031014 Typical Operating Circuit Detailed Description The following sections discuss in detail the Oscillator block, Power Control block, Clock/Calendar Register, Alarms, trickle Charger, and Serial I2C block. Oscillator Block Selection of the right crystal, correct load capacitance and careful PCB layout are important for a stable crystal oscillator. Due to the optimization for the lowest possible current in the design for these oscillators, losses caused by parasitic currents can have a significant impact on the overall oscillator performance. Extra care needs to be taken to maintain a certain quality and cleanliness of the PCB. Crystal Selection The key parameters when selecting a 32 kHz crystal to work with IDT1339 RTC are: • Recommended Load Capacitance • Crystal Effective Series Resistance (ESR) • Frequency Tolerance Effective Load Capacitance Please see diagram below for effective load capacitance calculation. The effective load capacitance (CL) should match the recommended load capacitance of the crystal in order for the crystal to oscillate at its specified parallel resonant frequency with 0ppm frequency error. In the above figure, X1 and X2 are the crystal pins of our device. Cin1 and Cin2 are the internal capacitors which include the X1 and X2 pin capacitance. Cex1 and Cex2 are the external capacitors that are needed to tune the crystal frequency. Ct1 and Ct2 are the PCB trace capacitances between the crystal and the device pins. CS is the shunt capacitance of the crystal (as specified in the crystal manufacturer's datasheet or measured using a network analyzer). Note: IDT1339CSRI integrates a standard 32.768 kHz (±20ppm) crystal in the package and contributes an additional frequency error of 10ppm at nominal VCC (+3.3 V) and TA=+25°C. CPU X1 X2 VCC SQW/INT VBACKUP GND SDA SCL CRYSTAL IDT1339 + - VCC RPU 2k VCC VCC 10k RPU 2k 12 6 5 7 3 4 8 |
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