Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

RV5C387A Datasheet(PDF) 7 Page - RICOH electronics devices division

Part No. RV5C387A
Description  I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?
Download  42 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C387A Datasheet(HTML) 7 Page - RICOH electronics devices division

Back Button RV5C387A Datasheet HTML 3Page - RICOH electronics devices division RV5C387A Datasheet HTML 4Page - RICOH electronics devices division RV5C387A Datasheet HTML 5Page - RICOH electronics devices division RV5C387A Datasheet HTML 6Page - RICOH electronics devices division RV5C387A Datasheet HTML 7Page - RICOH electronics devices division RV5C387A Datasheet HTML 8Page - RICOH electronics devices division RV5C387A Datasheet HTML 9Page - RICOH electronics devices division RV5C387A Datasheet HTML 10Page - RICOH electronics devices division RV5C387A Datasheet HTML 11Page - RICOH electronics devices division Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 42 page
background image
PRELIMINARY
RV5C387A
12345
- 7 -
12. GENERAL DESCRIPTION
(1) Interface with CPU
The RV5C387A is connected to the CPU by two signal lines SCL and SDA, through which it reads and writes
data from and to the CPU.
Since the output of the I/O pin of SDA is open drain, data interfacing with a CPU
different supply voltage is possible by applying pull-up resistors on the circuit board. The maximum clock
frequency of 400kHz (at VDD
≥2.5V) of SCL enables data transfer in I2C-Bus fast mode.
(2) Clock and Calendar Function
The RV5C387A reads and writes time data from and to the CPU in units ranging from seconds to the last two
digits of the calendar year.
The calendar year will automatically be identified as a leap year when its last two
digits are a multiple of 4. Also available is the 1900 / 2000 identification bit for Year 2000 compliance.
Consequently, leap years up to the year 2099 can automatically be identified as such.
*) The year 2000 is a leap year while the year 2100 is not a leap year.
(3) Alarm Function
The RV5C387A incorporates the alarm interrupt circuit configured to generate interrupt signals to the CPU at
preset times.
The alarm interrupt circuit allows two types of alarm settings specified by the Alarm_W
registers and the Alarm_D registers.
The Alarm_W registers allow week, hour, and minute alarm settings
including combinations of multiple day-of-week settings such as "Monday, Wednesday, and Friday" and
"Saturday and Sunday".
The Alarm_D registers allow hour and minute alarm settings.
The Alarm_W
outputs from /INTRB pin, and the Alarm_D outputs from /INTRC pin.
The current /INTRB or /INTRC
conditions specified by the flag bits for each alarm function can be checked from the CPU by using a polling
function.
(4) High-precision Oscillation Adjustment Function
The RV5C387A has built-in oscillation stabilization capacitors (CG and CD), which can be connected to an
external crystal oscillator to configure an oscillation circuit.
To correct deviations in the oscillation frequency
of the crystal oscillator, the oscillation adjustment circuit is configured to allow correction of a time count gain
or loss (up to
±1.5 ppm at 25°C) from the CPU within a maximum range of approximately + 189 ppm in
increments of approximately 3 ppm.
Such oscillation frequency adjustment in each system has the following
advantages:
*
Allows timekeeping with much higher precision than conventional RTCs while using a crystal oscillator with
a wide range of precision variations.
*
Corrects seasonal frequency deviations through seasonal oscillation adjustment.
* Allows timekeeping with higher precision particularly with a temperature sensing function out of RTC,
through oscillation adjustment in tune with temperature fluctuations.
(5) Oscillation Halt Sensing Function and Supply Voltage Monitoring Function
The RV5C387A incorporates an oscillation halt sensing circuit equipped with internal registers configured to
record any past oscillation halt, thereby identifying whether they are powered on from 0 volts or battery
backed-up.
As such, the oscillation halt sensing circuit is useful for judging the validity of time data.
The RV5C387A also incorporates a supply voltage monitoring circuit equipped with internal registers
configured to record any drop in supply voltage below a certain threshold value.
Supply voltage monitoring
threshold settings can be selected between 2.1 and 1.6 volts through internal register settings.
The
oscillation halt sensing circuit is configured to confirm the established invalidation of time data in contrast to
the supply voltage monitoring circuit intended to confirm the potential invalidation of time data.
Further, the
supply voltage monitoring circuit can be applied to battery supply voltage monitoring.


Similar Part No. - RV5C387A

ManufacturerPart No.DatasheetDescription
RICOH electronics devices division
RICOH electronics devic...
RV5C387A RICOH-RV5C387A Datasheet
376Kb / 49P
   I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
RV5C387A RICOH-RV5C387A_03 Datasheet
376Kb / 49P
   I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
More results

Similar Description - RV5C387A

ManufacturerPart No.DatasheetDescription
RICOH electronics devices division
RICOH electronics devic...
RV5C386A RICOH-RV5C386A Datasheet
362Kb / 42P
   I2C-bus Real-Time Clock ICs with Voltage Monitoring Function
RV5C386A RICOH-RV5C386A_03 Datasheet
377Kb / 49P
   I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
RV5C387A RICOH-RV5C387A_03 Datasheet
376Kb / 49P
   I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
RV5C338A RICOH-RV5C338A Datasheet
440Kb / 52P
   3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION?
RV5C339A RICOH-RV5C339A Datasheet
421Kb / 51P
   3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION???
RS5C348A RICOH-RS5C348A Datasheet
452Kb / 53P
   4-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION?
RS5C338A RICOH-RS5C338A Datasheet
578Kb / 51P
   3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION
RS5C372A RICOH-RS5C372A Datasheet
442Kb / 59P
   I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs
Golledge Electronics Ltd
Golledge Electronics Lt...
RV1805C3 GOLLEDGE-RV1805C3 Datasheet
156Kb / 1P
   Real Time Clock - I2C Bus
RV3029C3 GOLLEDGE-RV3029C3_16 Datasheet
155Kb / 1P
   Real Time Clock - I2C Bus
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  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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