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Ramtron

FM3135 Datasheet Preview

FM3135 Datasheet

Integrated RTC/Alarm/F-RAM & Embedded Crystal

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www.DataSheet.co.kr
Preliminary
FM3135
Integrated RTC/Alarm/F-RAM & Embedded Crystal
Features
High Integration Device Replaces Multiple Parts
Serial Nonvolatile Memory
Real-time Clock (RTC) with Alarm
Clock Output (Programmable frequency)
64Kb Ferroelectric Nonvolatile RAM
Internally Organized as 8Kx8
Unlimited Read/Write Endurance
45 year Data Retention
NoDelay™ Writes
Fast Two-wire Serial Interface
Up to 1 MHz Maximum Bus Frequency
Supports Legacy Timing for 100 kHz & 400 kHz
RTC & F-RAM Controlled via 2-wire Interface
Real-time Clock/Calendar
Embedded 32.768 kHz Crystal
Backup Current under 1 µA
Seconds through Centuries in BCD format
Tracks Leap Years through 2099
Software Calibration
Supports Battery or Capacitor Backup
Easy to Use Configurations
Operates from 2.7 to 3.6V
20-pin “Green”/RoHS SOIC (-G)
Low Operating Current
Industrial Temperature -40°C to +85°C
Underwriters Laboratory (UL) Recognized
Description
The FM3135 integrates a real-time clock (RTC) and
F-RAM nonvolatile memory. The 32.768kHz crystal
is embedded inside the package. The device operates
from 2.7 to 3.6V.
The FM3135 provides nonvolatile F-RAM which
features fast write speed and unlimited endurance.
This allows the memory to serve as extra RAM for
the system microcontroller or conventional
nonvolatile storage. This memory is truly nonvolatile
rather than battery backed.
The real-time clock (RTC) provides time and date
information in BCD format. It can be permanently
powered from external backup voltage source, either
a battery or a capacitor. The timekeeper uses a crystal
integral to the package and provides a calibration
mode that allows software adjustment of timekeeping
accuracy.
Pin Configuration
NC 1
20
NC 2
19
ACS
3
18
VDD
4
17
NC 5
16
NC 6
15
NC 7
14
NC 8
13
NC 9
12
NC 10 11
NC
VSS
SCL
SDA
VBAK
VSS
NC
NC
NC
NC
Pin Name
ACS
SDA
SCL
VBAK
VDD
VSS
Function
Alarm/Calibration/SqWave
Serial Data
Serial Clock
Battery-Backup Supply
Supply Voltage
Ground
Ordering Information
FM3135-G
“Green”/RoHS 20-pin SOIC
FM3135-GTR “Green”/RoHS 20-pin SOIC,
Tape & Reel
This is a product that has fixed target specifications but are subject
to change pending characterization results.
Rev. 1.2
Feb. 2009
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
Page 1 of 21
Datasheet pdf - http://www.DataSheet4U.net/




Ramtron

FM3135 Datasheet Preview

FM3135 Datasheet

Integrated RTC/Alarm/F-RAM & Embedded Crystal

No Preview Available !

www.DataSheet.co.kr
FM3135 Integrated RTC/Alarm/FRAM & Embedded Crystal
SCL
SDA
2-Wire
Interface
LockOut
VDD
VBAK
VSW
-
+
F-RAM
Array
Special
Function
Registers
RTC Cal.
Switched Power
RTC Registers
RTC
Alarm
Alarm
512Hz/SQW
Nonvolatile
Battery Backed
Figure 1. Block Diagram
ACS
Pin Descriptions
Pin Name
ACS
Type
Output
SDA
I/O
SCL
VBAK
VDD
VSS
Input
Supply
Supply
Supply
Pin Description
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.
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.
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.
Backup supply voltage: A 3V battery or a large value capacitor. If no backup supply is
used, this pin should be tied to VSS. The trickle charger is UL recognized and ensures no
excessive current when using a lithium battery.
Supply Voltage.
Ground
Rev. 1.2
Feb. 2009
Page 2 of 21
Datasheet pdf - http://www.DataSheet4U.net/


Part Number FM3135
Description Integrated RTC/Alarm/F-RAM & Embedded Crystal
Maker Ramtron
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FM3135 Datasheet PDF






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