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FM4005 Datasheet(PDF) 1 Page - Ramtron International Corporation |
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FM4005 Datasheet(HTML) 1 Page - Ramtron International Corporation |
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1 / 23 page  Pre-Production This is a product in pre-production phase of development. Device Ramtron International Corporation characterization is complete and Ramtron does not expect to change 1850 Ramtron Drive, Colorado Springs, CO 80921 the specifications. Ramtron will issue a Product Change Notice if (800) 545-FRAM, (719) 481-7000 any specification changes are made. www.ramtron.com Rev. 2.3 Oct. 2006 Page 1 of 23 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. |
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Similar Description - FM4005 |
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