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DS1339 Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS1339 Datasheet(HTML) 7 Page - Dallas Semiconductor |
7 / 18 page DS1339 I 2C Serial Real-Time Clock 7 of 18 PIN DESCRIPTION PIN mSOP SO NAME FUNCTION 1 — X1 2 — X2 Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for operation with a crystal having a specified load capacitance (CL) of 6pF. An external 32.768kHz oscillator can also drive the DS1339. In this configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is floated. For more information about crystal selection and crystal layout considerations, refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks. 3 14 VBACKUP Secondary Power Supply. Supply voltage must be held between 1.3V and 3.7V for proper operation. This pin can be connected to a primary cell, such as a lithium button cell. Additionally, this pin can be connected to a rechargeable cell or a super cap when used in conjunction with the trickle-charge feature. Diodes should not be placed in series between the battery and the VBACKUP input, or improper operation will result. UL recognized to ensure against reverse charging current when used with a lithium battery If a back up supply is not required, VBACKUP must be grounded. 4 15 GND Ground. DC power is provided to the device on these pins. 5 16 SDA Serial Data Input/Output. SDA is the input/output pin for the I 2C serial interface. The SDA pin is an open-drain output and requires an external pullup resistor. 6 1 SCL Serial Clock Input. SCL is used to synchronize data movement on the serial interface. 7 2 SQW/ INT Square-Wave/Interrupt Output. Programmable square-wave or interrupt output signal. The SQW/ INT pin is an open-drain output and requires an external pullup resistor. 8 3 VCC Power Supply. DC power is provided to the device on these pins. — 4–13 N.C. No Connection. These pins are unused and must be connected to ground. TYPICAL OPERATING CIRCUIT DS1339 4 CPU VCC VCC VCC 5 6 8 12 SDA SCL GND X2 X1 VCC RPU RPU CRYSTAL SQW /INT VBACKUP 3 7 i |
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