Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

FM3164 Folha de dados(PDF) 8 Page - Ramtron International Corporation

Nome de Peças FM3164
Descrição Electrónicos  Integrated Processor Companion with Memory
Download  26 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  RAMTRON [Ramtron International Corporation]
Página de início  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM3164 Folha de dados(HTML) 8 Page - Ramtron International Corporation

Back Button FM3164 Datasheet HTML 4Page - Ramtron International Corporation FM3164 Datasheet HTML 5Page - Ramtron International Corporation FM3164 Datasheet HTML 6Page - Ramtron International Corporation FM3164 Datasheet HTML 7Page - Ramtron International Corporation FM3164 Datasheet HTML 8Page - Ramtron International Corporation FM3164 Datasheet HTML 9Page - Ramtron International Corporation FM3164 Datasheet HTML 10Page - Ramtron International Corporation FM3164 Datasheet HTML 11Page - Ramtron International Corporation FM3164 Datasheet HTML 12Page - Ramtron International Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 26 page
background image
FM3104/16/64/256
Rev. 2.1
Sept. 2011
Page 8 of 26
32.768 kHz
crystal
Oscillator
Clock
Divider
Update
Logic
512 Hz
W
R
Seconds
7 bits
Minutes
7 bits
Hours
6 bits
Date
6 bits
Months
5 bits
Years
8 bits
CF
Days
3 bits
User Interface Registers
1 Hz
/OSCEN
Figure 9. Real-Time Clock Core Block Diagram
Calibration
When the CAL bit in a register 00h is set to 1, the
clock enters calibration mode. In calibration mode,
the CAL/PFO output pin is dedicated to the
calibration function and the power fail output is
temporarily unavailable. Calibration operates by
applying a digital correction to the counter based on
the frequency error. In this mode, the CAL/PFO pin
is driven with a 512 Hz (nominal) square wave. Any
measured deviation from 512 Hz translates into a
timekeeping error. The user converts the measured
error in ppm and writes the appropriate correction
value to the calibration register. The correction
factors are listed in the table below. Positive ppm
errors require a negative adjustment that removes
pulses. Negative ppm errors require a positive
correction that adds pulses. Positive ppm adjustments
have the CALS (sign) bit set to 1, where as negative
ppm adjustments have CALS = 0. After calibration,
the clock will have a maximum error of  2.17 ppm
or  0.09 minutes per month at the calibrated
temperature.
The calibration setting is stored in FRAM so is not
lost should the backup source fail. It is accessed with
bits CAL.4-0 in register 01h. This value only can be
written when the CAL bit is set to a 1. To exit the
calibration mode, the user must clear the CAL bit to a
0. When the CAL bit is 0, the CAL/PFO pin will
revert to the power fail output function.
Crystal Oscillator
The crystal oscillator is designed to use a 6pF crystal
without the need for external components, such as
loading capacitors. The FM31xx device has built-in
loading capacitors that match the crystal.
If a 32.768kHz crystal is not used, an external
oscillator may be connected to the FM31xx. Apply
the oscillator to the X1 pin. Its high and low voltage
levels can be driven rail-to-rail or amplitudes as low
as approximately 500mV p-p.
To ensure proper
operation, a DC bias must be applied to the X2 pin.
It should be centered between the high and low levels
on the X1 pin.
This can be accomplished with a
voltage divider.
Figure 10. External Oscillator
In the example, R1 and R2 are chosen such that the
X2 voltage is centered around the X1 oscillator drive
levels. If you wish to avoid the DC current, you may
choose to drive X1 with an external clock and X2
with an inverted clock using a CMOS inverter.
Layout Requirements
The X1 and X2 crystal pins employ very high
impedance circuits and the oscillator connected to
these pins can be upset by noise or extra loading. To
reduce RTC clock errors from signal switching noise,
a guard ring must be placed around these pads and
the guard ring grounded. SDA and SCL traces should
be routed away from the X1/X2 pads. The X1 and X2
trace lengths should be less than 5 mm. The use of a
ground plane on the backside or inner board layer is
preferred. See layout example. Red is the top layer,
green is the bottom layer.
X1 X2
Vdd
FM31xx
R1
R2


Nº de peça semelhante - FM3164

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
List of Unclassifed Man...
FM3164 ETC1-FM3164 Datasheet
252Kb / 22P
   Integrated Processor Companion with Memory
logo
Ramtron International C...
FM3164 RAMTRON-FM3164 Datasheet
546Kb / 25P
   Integrated Processor Companion with Memory
logo
Cypress Semiconductor
FM3164 CYPRESS-FM3164 Datasheet
773Kb / 27P
   Integrated Processor Companion with Memory
FM3164 CYPRESS-FM3164 Datasheet
579Kb / 33P
   64-Kbit/256-Kbit Integrated Processor Companion with F-RAM
logo
Ramtron International C...
FM3164-G RAMTRON-FM3164-G Datasheet
546Kb / 25P
   Integrated Processor Companion with Memory
More results

Descrição semelhante - FM3164

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
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...
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 21 22 23 24 25 26


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
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