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FM31L272-GTR Scheda tecnica(PDF) 3 Page - Ramtron International Corporation |
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FM31L272-GTR Scheda tecnica(HTML) 3 Page - Ramtron International Corporation |
3 / 25 page FM31L278/L276/L274/L272 - 3V I2C Companion Rev. 3.0 Feb. 2009 Page 3 of 25 Figure 1. Block Diagram Pin Descriptions Pin Name Type Pin Description A0, A1 Input Device select inputs are used to address multiple memories on a serial bus. To select the device the address value on the two pins must match the corresponding bits contained in the device address. The device select pins are pulled down internally. CNT1, CNT2 Input Event Counter Inputs: These battery-backed inputs increment counters when an edge is detected on the corresponding CNT pin. The polarity is programmable. These pins should not be left floating. Tie to ground if these pins are not used. CAL/PFO Output In calibration mode, this pin supplies a 512 Hz square-wave output for clock calibration. In normal operation, this is the early power-fail output. 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 Oscillator section for suggestions). /RST I/O Active low reset output with weak pull-up. Also input for manual reset. 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 in on the rising edge. The SCL input also incorporates a Schmitt trigger input for noise immunity. PFI Input Early Power-fail Input: Typically connected to an unregulated power supply to detect an early power failure. This pin should not be left floating. 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 ground and the VBC bit should be cleared. The trickle charger is UL recognized and ensures no excessive current when using a lithium battery. VDD Supply Supply Voltage VSS Supply Ground F-RAM Array 2-Wire Interface SCL SDA RST A1, A0 CAL/PFO PFI VDD VBAK RTC 2.5V - + RTC Registers Event Counters CNT1 CNT2 Special Function Registers S/N X1 X2 LockOut LockOut + - 1.2V Watchdog LV Detect Switched Power 512Hz RTC Cal. Battery Backed Nonvolatile |
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