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DS1685Q-3+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS1685Q-3+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 34 page DS1685/DS1687 3V/5V Real-Time Clocks 6 of 34 Figure 1. Block Diagram OSCILLATOR CIRCUIT The DS1685 uses an external 32.768kHz crystal. The oscillator circuit does not require any external resistors or capacitors to operate. Table 1 specifies several crystal parameters for the external crystal, and Figure 2 shows a functional schematic of the oscillator circuit. The oscillator is controlled by an enable bit in the control register. Oscillator startup times are highly dependent upon crystal characteristics, PC board leakage, and layout. High ESR and excessive capacitive loads are the major contributors to long startup times. A circuit using a crystal with the recommended characteristics and proper layout usually starts within one second. Power Control V BAT GND OSC BUS Interface V CC X1 X2 CS WR ALE RD AD0 - AD7 Divide by 8 Divide by 64 Divide by 64 16:1 M ux Square W ave Generator Registers A, B,C,D Clock/Calendar and Alarm Registers User Ram 114 Bytes Clock/Calender Update Logic IR Q SQW RLC R IRQ Generator Buffered Clock/ Calendar and Alarm Registers V BAUX Extended RAM Addr/ Data Registers Extended Control/ Status Registers 64-Bit Serial Num ber Century Counter Date Alarm RTC Address -2 RTC Address -3 Extended User RAM 128 Bytes RAM Clear Logic DS1687 only DS1687 only Select PW R KS DS1685/DS1687 |
Similar Part No. - DS1685Q-3+ |
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Similar Description - DS1685Q-3+ |
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