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DS1337U Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1337U Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 13 page DS1337 5 of 13 PIN DESCRIPTION PIN NAME DESCRIPTION 1 X1 2 X2 These signals are connections for a standard 32.768kHz quartz crystal. The internal oscillator circuitry is designed for operation with a crystal having a specified load capacitance (CL) of 6pF. For more information about crystal selection and crystal layout considerations, refer to Application Note 58: Crystal Considerations with Dallas Real- Time Clocks. An external 32.768kHz oscillator can also drive the DS1337. In this configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is floated. 3 INTA Interrupt Output. When enabled, INTA is asserted low when the time/day/date matches the values set in the alarm registers. This pin is an open-drain output and requires an external pullup resistor. 4 GND DC power is provided to the device on these pins. 5 SDA Serial Data Input/Output. SDA is the input/output pin for the 2-wire serial interface. The SDA pin is open-drain output and requires an external pullup resistor. 6 SCL Serial Clock Input. SCL is used to synchronize data movement on the serial interface. 7 SQW/ INTB Square-Wave/Interrupt Output. Programmable square-wave or interrupt output signal. It is an open-drain output and requires an external pullup resistor. 8 VCC DC power is provided to the device on these pins. Figure 1. Recommended Layout for Crystal |
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