FM4005 データシートの表示（PDF） - Ramtron International Corporation

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FM4005

Integrated Processor Companion

Ramtron International Corporation 

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 VDD and Watchdog

• Programmable Low VDD 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

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-VDD 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.

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.

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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