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DS1306E+TR Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DS1306E+TR Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 22 page DS1306 5 of 22 RECOMMENDED LAYOUT FOR CRYSTAL CLOCK ACCURACY The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional error is added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the oscillator circuit can result in the clock running fast. Refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks for detailed information. Table 1. Crystal Specifications PARAMETER SYMBOL MIN TYP MAX UNITS Nominal Frequency fO 32.768 kHz Series Resistance ESR 45 kΩ Load Capacitance CL 6 pF *The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations for Dallas Real-Time Clocks for additional specifications. CLOCK, CALENDAR, AND ALARM The time and calendar information is obtained by reading the appropriate register bytes. The RTC registers are illustrated in Figure 2. The time, calendar, and alarm are set or initialized by writing the appropriate register bytes. Note that some bits are set to 0. These bits always read 0 regardless of how they are written. Also note that registers 12h to 1Fh (read) and registers 92h to 9Fh are reserved. These registers always read 0 regardless of how they are written. The contents of the time, calendar, and alarm registers are in the BCD format.. Values in the day register that correspond to the day of the week are user-defined, but must be sequential (e.g. if 1 equals Sunday, 2 equals Monday and so on). The day register increments at midnight. Illogical time and date entries result in undefined operation. WRITING TO THE CLOCK REGISTERS The internal time and date registers continue to increment during write operations. However, the countdown chain is reset when the seconds register is written. Writing the time and date registers within one second after writing the seconds register ensures consistent data. Terminating a write before the last bit is sent aborts the write for that byte. READING FROM THE CLOCK REGISTERS Buffers are used to copy the time and date register at the beginning of a read. When reading in burst mode, the user copy is static while the internal registers continue to increment. Local ground plane (Layer 2) crystal X1 X2 GND |
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