データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

FM3264 データシート(PDF) 4 Page - List of Unclassifed Manufacturers

部品番号 FM3264
部品情報  Integrated Processor Companion with Memory
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  ETC1 [List of Unclassifed Manufacturers]
ホームページ  
Logo ETC1 - List of Unclassifed Manufacturers

FM3264 データシート(HTML) 4 Page - List of Unclassifed Manufacturers

  FM3264 Datasheet HTML 1Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 2Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 3Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 4Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 5Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 6Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 7Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 8Page - List of Unclassifed Manufacturers FM3264 Datasheet HTML 9Page - List of Unclassifed Manufacturers Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 20 page
background image
FM3204/16/64/256
Rev 2.1
Dec. 2004
Page 4 of 20
Overview
The FM32xx family combines a serial nonvolatile
RAM with a processor companion. The companion is
a highly integrated peripheral including a processor
supervisor, a comparator used for early power-fail
warning, nonvolatile event counters, and a 64-bit
serial number. The FM32xx integrates these
complementary but distinct functions that share a
common interface in a single package. Although
monolithic, the product is organized as two logical
devices, the FRAM memory and the companion.
From the system perspective they appear to be two
separate devices with unique IDs on the serial bus.
The FM32xx provides the same functions as the
FM31xx with the exception of the real-time clock.
This makes it easy to develop a common design that
can either include timekeeping by using the FM31xx
or exclude it by using the FM32xx. All other features
are identical. The register address map is even
preserved so that software can be identical.
The memory is organized as a stand-alone 2-wire
nonvolatile memory with a standard device ID value.
The companion functions are accessed under their
own 2-wire device ID. This allows the companion
functions to be read while maintaining the most
recently used memory address. The companion
functions are controlled by 16 special function
registers. The event counter circuits and related
registers are maintained by the power source on the
VBAK pin, allowing them to operate from battery or
backup capacitor power when VDD drops below a set
threshold. Each functional block is described below.
Memory Operation
The FM32xx is a family of products available in
different memory sizes including 4Kb, 16Kb, 64Kb,
and 256Kb. The family is software compatible, all
versions use consistent two-byte addressing for the
memory device. This makes the lowest density
device different from its stand-alone memory
counterparts but makes them compatible within the
entire family.
Memory is organized in bytes, for example the 4Kb
memory is 512 x 8 and the 256Kb memory is 32,768
x 8. The memory is based on FRAM technology.
Therefore it can be treated as RAM and is read or
written at the speed of the two-wire bus with no
delays for write operations. It also offers effectively
unlimited write endurance unlike other nonvolatile
memory technologies. The 2-wire interface protocol
is described further on page 13.
The memory array can be write-protected by
software. Two bits in the processor companion area
(WP0, WP1 in register 0Bh) control the protection
setting as shown in the following table. Based on the
setting, the protected addresses cannot be written and
the 2-wire interface will not acknowledge any data to
protected addresses. The special function registers
containing these bits are described in detail below.
Write protect addresses
WP1
WP0
None
0
0
Bottom 1/4
0
1
Bottom 1/2
1
0
Full array
1
1
Processor Companion
In addition to nonvolatile RAM, the FM32xx family
incorporates
a
highly
integrated
processor
companion. It includes a low voltage reset, a
programmable watchdog timer, battery-backed event
counters, a comparator for early power-fail detection
or other purposes, and a 64-bit serial number.
Processor Supervisor
Supervisors provide a host processor two basic
functions: detection of power supply fault conditions
and a watchdog timer to escape a software lockup
condition. All FM32xx devices have a reset pin
(/RST) to drive the processor reset input during
power faults (and power-up) and software lockups. It
is an open drain output with a weak internal pull-up
to VDD. This allows other reset sources to be wire-
OR’d to the /RST pin. When VDD is above the
programmed trip point, /RST output is pulled weakly
to VDD. If VDD drops below the reset trip point
voltage level (VTP) the /RST pin will be driven low. It
will remain low until VDD falls too low for circuit
operation which is the VRST level. When VDD rises
again above VTP, /RST will continue to drive low for
at least 100 ms (tRPU) to ensure a robust system reset
at a reliable VDD level. After tRPU has been met, the
/RST pin will return to the weak high state. While
/RST is asserted, serial bus activity is locked out even
if a transaction occurred as VDD dropped below VTP.
A memory operation started while VDD is above VTP
will be completed internally.
The bits VTP1 and VTP0 control the trip point of the
low voltage detect circuit. They are located in register
0Bh, bits 1 and 0. The figure below illustrates the
reset operation in response to the VDD voltage.
VTP
VTP1
VTP0
2.6V
0
0
2.9V
0
1
3.9V
1
0
4.4V
1
1


同様の部品番号 - FM3264

メーカー部品番号データシート部品情報
logo
Rectron Semiconductor
FM320 RECTRON-FM320 Datasheet
25Kb / 2P
   SURFACE MOUNT SCHOTTKY BARRIER RECTIFIER(VOLTAGE RANGE 20 to 100 Volts CURRENT 3.0 Amperes)
logo
Formosa MS
FM320 FORMOSA-FM320 Datasheet
70Kb / 2P
   Silicon epitaxial planer type
logo
SHENZHEN YONGERJIA INDU...
FM320 WINNERJOIN-FM320 Datasheet
87Kb / 2P
   Chip Schottky Barrier Diodes
logo
Formosa MS
FM320-A FORMOSA-FM320-A Datasheet
69Kb / 2P
   Silicon epitaxial planer type
FM320-A FORMOSA-FM320-A Datasheet
68Kb / 2P
   Chip Schottky Barrier Diodes - Silicon epitaxial planer type
More results

同様の説明 - FM3264

メーカー部品番号データシート部品情報
logo
List of Unclassifed Man...
FM3104 ETC1-FM3104 Datasheet
252Kb / 22P
   Integrated Processor Companion with Memory
logo
Ramtron International C...
FM31256 RAMTRON-FM31256_11 Datasheet
455Kb / 26P
   Integrated Processor Companion with Memory
FM3104 RAMTRON-FM3104 Datasheet
546Kb / 25P
   Integrated Processor Companion with Memory
logo
Cypress Semiconductor
FM31256-GTR CYPRESS-FM31256-GTR Datasheet
773Kb / 27P
   Integrated Processor Companion with Memory
FM31256-G CYPRESS-FM31256-G Datasheet
773Kb / 27P
   Integrated Processor Companion with Memory
logo
Ramtron International C...
FM31L278 RAMTRON-FM31L278 Datasheet
330Kb / 25P
   3V Integrated Processor Companion with Memory
FM32L278 RAMTRON-FM32L278 Datasheet
275Kb / 21P
   3V Integrated Processor Companion with Memory
logo
Cypress Semiconductor
FM31278 CYPRESS-FM31278 Datasheet
862Kb / 26P
   5V Integrated Processor Companion with Memory
logo
Ramtron International C...
FM33256 RAMTRON-FM33256 Datasheet
316Kb / 28P
   3V Integrated Processor Companion with Memory
FM33256 RAMTRON-FM33256_09 Datasheet
319Kb / 28P
   3V Integrated Processor Companion with Memory
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com