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DS1305EN+R Datasheet(PDF) 3 Page - Dallas Semiconductor |
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DS1305EN+R Datasheet(HTML) 3 Page - Dallas Semiconductor |
3 / 21 page DS1305 3 of 21 PIN DESCRIPTION PIN DIP TSSOP NAME FUNCTION 1 1 VCC2 Backup Power Supply. This is the secondary power supply pin. In systems using the trickle charger, the rechargeable energy source is connected to this pin. 2 2 VBAT Battery Input for Standard +3V Lithium Cell or Other Energy Source. If not used, VBAT must be connect to ground. Diodes must not be placed in series between VBAT and the battery, or improper operation will result. UL recognized to ensure against reverse charging current when used in conjunction with a lithium battery. See “Conditions of Acceptability” at www.maxim-ic.com/TechSupport/QA/ntrl.htm. 3 3 X1 4 5 X2 Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator is designed for operation with a crystal having a specified load capacitance of 6pF. For more information on crystal selection and crystal layout considerations, refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks. The DS1305 can also be driven by an external 32.768kHz oscillator. In this configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is floated. 5 4, 6, 8, 13, 19 N.C. No Connection 6 7 INT0 Active-Low Interrupt 0 Output. The INT0 pin is an active low output of the DS1305 that can be used as an interrupt input to a processor. The INT0 pin can be programmed to be asserted by only Alarm 0 or can be programmed to be asserted by either Alarm 0 or Alarm 1. The INT0 pin remains low as long as the status bit causing the interrupt is present and the corresponding interrupt enable bit is set. The INT0 pin operates when the DS1305 is powered by VCC1, VCC2, or VBAT. The INT0 pin is an open-drain output and requires an external pullup resistor. 7 9 INT1 Active-Low Interrupt 1 Output. The INT1 pin is an active-low output of the DS1305 that can be used as an interrupt input to a processor. The INT1 pin can be programmed to be asserted by Alarm 1 only. The INT1 pin remains low as long as the status bit causing the interrupt is present and the corresponding interrupt enable bit is set. The INT1 pin operates when the DS1305 is powered by VCC1, VCC2, or VBAT. The INT1 pin is an open-drain output and requires an external pullup resistor. Both INT0 and INT1 are open- drain outputs. The two interrupts and the internal clock continue to run regardless of the level of VCC (as long as a power source is present). 8 10 GND Ground 9 11 SERMODE Serial Interface Mode. The SERMODE pin offers the flexibility to choose between two serial interface modes. When connected to GND, standard 3-wire communication is selected. When connected to VCC, SPI communication is selected. 10 12 CE Chip Enable. The chip-enable signal must be asserted high during a read or a write for both 3-wire and SPI communication. This pin has an internal 55k W pulldown resistor (typical). 11 14 SCLK Serial Clock Input. SCLK is used to synchronize data movement on the serial interface for either the SPI or 3-wire interface. |
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