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FM3130-DG Datasheet(PDF) 2 Page - Ramtron International Corporation

Part # FM3130-DG
Description  Integrated RTC/Alarm and 64Kb FRAM
Download  22 Pages
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Manufacturer  RAMTRON [Ramtron International Corporation]
Direct Link  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM3130-DG Datasheet(HTML) 2 Page - Ramtron International Corporation

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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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