Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

FM32L278-G Scheda tecnica(PDF) 11 Page - Ramtron International Corporation

Il numero della parte FM32L278-G
Spiegazioni elettronici  3V Integrated Processor Companion with Memory
Download  21 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  RAMTRON [Ramtron International Corporation]
Homepage  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM32L278-G Scheda tecnica(HTML) 11 Page - Ramtron International Corporation

Back Button FM32L278-G Datasheet HTML 7Page - Ramtron International Corporation FM32L278-G Datasheet HTML 8Page - Ramtron International Corporation FM32L278-G Datasheet HTML 9Page - Ramtron International Corporation FM32L278-G Datasheet HTML 10Page - Ramtron International Corporation FM32L278-G Datasheet HTML 11Page - Ramtron International Corporation FM32L278-G Datasheet HTML 12Page - Ramtron International Corporation FM32L278-G Datasheet HTML 13Page - Ramtron International Corporation FM32L278-G Datasheet HTML 14Page - Ramtron International Corporation FM32L278-G Datasheet HTML 15Page - Ramtron International Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 21 page
background image
FM32L278/L276/L274/L272 - 3V I2C Companion
Rev. 3.0
Feb. 2009
Page 11 of 21
Two-wire Interface
The FM32L27x employs an industry standard two-
wire bus that is familiar to many users. This product
is unique since it incorporates two logical devices in
one chip. Each logical device can be accessed
individually. Although monolithic, it appears to the
system software to be two separate products. One is
a memory device. It has a Slave Address (Slave ID =
1010b) that operates the same as a stand-alone
memory device. The second device is a real-time
clock and processor companion which have a unique
Slave Address (Slave ID = 1101b).
By convention, any device that is sending data onto
the bus is the transmitter while the target device for
this data is the receiver. The device that is
controlling the bus is the master. The master is
responsible for generating the clock signal for all
operations. Any device on the bus that is being
controlled is a slave. The FM32L27x is always a
slave device.
The bus protocol is controlled by transition states in
the SDA and SCL signals. There are four conditions:
Start, Stop, Data bit, and Acknowledge. The figure
below illustrates the signal conditions that specify
the four states. Detailed timing diagrams are shown
in the Electrical Specifications section.
Stop
(Master)
Start
(Master)
7
Data bits
(Transmitter)
6
0
Data bit
(Transmitter)
Acknowledge
(Receiver)
SCL
SDA
Figure 9. Data Transfer Protocol
Start Condition
A Start condition is indicated when the bus master
drives SDA from high to low while the SCL signal is
high. All read and write transactions begin with a
Start condition. An operation in progress can be
aborted by asserting a Start condition at any time.
Aborting an operation using the Start condition will
ready the FM32L27x for a new operation.
If the power supply drops below the specified VTP
during operation, any 2-wire transaction in progress
will be aborted and the system must issue a Start
condition prior to performing another operation.
Stop Condition
A Stop condition is indicated when the bus master
drives SDA from low to high while the SCL signal is
high. All operations must end with a Stop condition.
If an operation is pending when a stop is asserted,
the operation will be aborted. The master must have
control of SDA (not a memory read) in order to
assert a Stop condition.
Data/Address Transfer
All data transfers (including addresses) take place
while the SCL signal is high. Except under the two
conditions described above, the SDA signal should
not change while SCL is high.
Acknowledge
The Acknowledge (ACK) takes place after the 8th
data bit has been transferred in any transaction.
During this state the transmitter must release the
SDA bus to allow the receiver to drive it. The
receiver drives the SDA signal low to acknowledge
receipt of the byte. If the receiver does not drive
SDA low, the condition is a No-Acknowledge
(NACK) and the operation is aborted.
The receiver might NACK for two distinct reasons.
First is that a byte transfer fails. In this case, the
NACK ends the current operation so that the part can
be addressed again. This allows the last byte to be
recovered in the event of a communication error.
Second and most common, the receiver does not
send an ACK to deliberately terminate an operation.
For example, during a read operation, the FM32L27x
will continue to place data onto the bus as long as the
receiver sends ACKs (and clocks). When a read
operation is complete and no more data is needed,
the receiver must NACK the last byte. If the receiver
ACKs the last byte, this will cause the FM32L27x to
attempt to drive the bus on the next clock while the
master is sending a new command such as a Stop.


Codice articolo simile - FM32L278-G

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
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

Descrizione simile - FM32L278-G

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Ramtron International C...
FM31L278 RAMTRON-FM31L278 Datasheet
330Kb / 25P
   3V Integrated Processor Companion with Memory
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
FM31L278 RAMTRON-FM31L278_11 Datasheet
461Kb / 26P
   3V Integrated Processor Companion with Memory
logo
List of Unclassifed Man...
FM3104 ETC1-FM3104 Datasheet
252Kb / 22P
   Integrated Processor Companion with Memory
FM3204 ETC1-FM3204 Datasheet
273Kb / 20P
   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
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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