Pre-Production
FM4005
Integrated Processor Companion
Features
High Integration Device Replaces Multiple Parts
•
Real-time Clock (RTC)
•
Low Voltage Reset
•
Watchdog Timer
•
Early Power-Fail Warning/NMI
•
Two 16-bit Event Counters
•
Serial Number with Write-lock for Security
Real-Time Clock/Calendar
•
Backup Current under 1
µA
•
Seconds through Centuries in BCD format
•
Tracks Leap Years through 2099
•
Uses Standard 32.768 kHz Crystal (6pF)
•
Software Calibration
•
Calibration Data is Nonvolatile
•
Programmed Settings are Nonvolatile
•
Supports Battery or Capacitor Backup
Processor Companion
•
Active-low Reset Output for V
DD
and Watchdog
•
Programmable Low V
DD
Reset Thresholds
•
Manual Reset Filtered and Debounced
•
Programmable Watchdog Timer
•
Dual Battery-backed Event Counter Tracks System
Intrusions or other Events
•
Comparator for Early Power-Fail Interrupt
•
64-bit Programmable Serial Number with Lock
Fast Two-wire Serial Interface
•
Up to 1 MHz Maximum Bus Frequency
•
Supports Legacy Timing for 100 kHz & 400 kHz
Easy to Use Configurations
•
Operates from 2.7 to 5.5V
•
Small Footprint 14-pin “Green” SOIC (-G)
•
Low Operating Current
•
-40°C to +85°C Operation
The processor companion includes commonly needed
CPU support functions. Supervisory functions
include a reset output signal controlled by either a
low VDD condition or a watchdog timeout. /RST
goes active when VDD drops below a programmable
threshold and remains active for 100 ms after VDD
rises above the trip point. A programmable watchdog
timer runs from 100 ms to 3 seconds. The watchdog
timer is optional, but if enabled it will assert the reset
signal for 100 ms if not restarted by the host before
the timeout. A flag-bit indicates the source of the
reset.
A general-purpose comparator compares an external
input pin to the onboard 1.2V reference. This is
useful for generating a power-fail interrupt (NMI) but
can be used for any purpose. The device also includes
a programmable 64-bit serial number that can be
locked making it unalterable. Additionally it offers a
dual battery-backed event counter that tracks the
number of rising or falling edges detected on
dedicated input pins.
Description
The FM4005 is an integrated device that includes the
most commonly needed functions for processor-
based systems. Major features include real-time
clock, low-V
DD
reset, watchdog timer, battery-backed
event counter, lockable 64-bit serial number area, and
general purpose comparator that can be used for a
power-fail (NMI) interrupt or other purpose. The
family operates from 2.7 to 5.5V.
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
common external 32.768 kHz crystal and provides a
calibration mode that allows software adjustment of
timekeeping accuracy.
This is a product in pre-production phase of development. Device
characterization is complete and Ramtron does not expect to change
the specifications. Ramtron will issue a Product Change Notice if
any specification changes are made.
Rev. 2.3
Oct. 2006
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
www.ramtron.com
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RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
