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DS1672U-3+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS1672U-3+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 15 page DS1672 7 of 15 PIN DESCRIPTION PIN NAME FUNCTION 1, 2 X1, 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. For more information about crystal selection and crystal layout considerations, refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks. The DS1672 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. 3 VBACKUP Battery Input for Any Standard 3V Lithium Cell or Other Energy Source. Battery voltage must be held between 1.3V and 3.63V for proper operation. Diodes placed in series between the power source and the VBACKUP may result in improper operation. If a backup supply is not required, VBACKUP must be grounded. UL recognized to ensure against reverse charging current when used in conjunction with a lithium battery (charger disabled). See “Conditions of Acceptability” at www.maxim-ic.com/qa/info/ul. 4 GND Ground. DC power is provided to the device on this pin. 5 SDA Serial-Data Input/Output. SDA is the input/output pin for the I2C serial interface. The SDA pin is open drain and requires an external pullup resistor. 6 SCL I2C Serial-Clock Input. SCL is used to synchronize data movement on the serial interface and requires an external pullup resistor. 7 RST Active-Low Reset Output. It functions as a microprocessor reset signal. This pin is an open-drain output and requires an external pullup resistor. 8 VCC Power Pin for Primary Power Supply. When VCC is applied within normal limits, the device is fully accessible and data can be written and read. When VCC is below VPF, reads and writes are inhibited. Figure 3. Recommended Layout for Crystal LOCAL GROUND PLANE (LAYER 2) CRYSTAL X1 X2 GND |
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