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FM3130-DG Datasheet(PDF) 2 Page - Ramtron International Corporation |
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FM3130-DG Datasheet(HTML) 2 Page - Ramtron International Corporation |
2 / 22 page FM3130 Integrated RTC/Alarm with 64Kb FRAM Rev. 1.0 Sept. 2006 Page 2 of 22 Figure 1. Block Diagram Pin Descriptions Pin Name Type Pin Description X1, X2 I/O 32.768 kHz crystal connection. When using an external oscillator, apply the clock to X1 and a DC mid-level to X2 (see Crystal Type section for suggestions). ACS Output Alarm/Calibration/SquareWave: This is an open-drain output that requires an external pullup resistor. The alarm, calibration, and square wave functions all share this output. In Alarm mode, this pin acts as the active-low alarm output. In Calibration mode, a 512 Hz square-wave is driven out. In SquareWave mode, the user may select a frequency of 1, 512, 4096, or 32768 Hz to be used as a continuous output. Refer to Table 3. Control Bit Settings for ACS Pin to determine the bit settings for each mode. SDA I/O Serial Data & Address: This is a bi-directional line for the two-wire interface. It is open-drain and is intended to be wire-OR’d with other devices on the two-wire bus. The input buffer incorporates a Schmitt trigger for noise immunity and the output driver includes slope control for falling edges. A pull-up resistor is required. SCL Input Serial Clock: The serial clock line for the two-wire interface. Data is clocked out of the part on the falling edge, and data into the device on the rising edge. The SCL input also incorporates a Schmitt trigger input for noise immunity. VBAK Supply Backup supply voltage: A 3V battery or a large value capacitor. If no backup supply is used, this pin should be tied to VSS. VDD Supply Supply Voltage. VSS Supply Ground FRAM Array 2-Wire Interface RTC VSW - + RTC Registers Special Function Registers X1 X2 LockOut Switched Power RTC Cal. Battery Backed Nonvolatile ACS Alarm 512Hz/SQW Alarm SCL SDA VDD VBAK |
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