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RV5C386A Datasheet(PDF) 27 Page - RICOH electronics devices division

Part No. RV5C386A
Description  I2C-bus Real-Time Clock ICs with Voltage Monitoring Function
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C386A Datasheet(HTML) 27 Page - RICOH electronics devices division

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PRELIMINARY
RV5C386A
12345
- 27 -
14.2.2.
Measurement of Oscillation Frequency
Frequency
Counter
OSCIN
OSCOUT
32KOUT
VSS
32768Hz
VDD
CLKC
* 1) The RV5C386A is configured to generate 32.768-kHz clock pulses for output from the 32KOUT pin.
* 2) A frequency counter with 6 (more preferably 7) or more digits on the order of 1ppm is recommended for
use in the measurement of the oscillation frequency of the oscillation circuit.
* 3) The CLKC pin should be connected to the VDD pin as a pull-up resistor.
14.2.3.
Adjustment of Oscillation frequency
The oscillation frequency of the oscillation circuit can be adjusted by varying procedures depending on the
usage of Model RV5C386A in the system into which they are to be built and on the allowable degree of time
count errors.
The flow chart below serves as a guide to selecting an optimum oscillation frequency
adjustment procedure for the relevant system.
Start
Course (B)
Use 32-kHz clock output without regard
to its frequency precision
NO
YES
Use 32-kHz
clock output?
YES
NO
Course (C)
Course (A)
Course (D)
YES
YES
NO
NO
Allowable time count precision on order of oscillation
frequency variations of crystal oscillator (*1) plus
frequency variations of RTC (*2)?
(*3)
Allowable time count precision on order of oscillation
frequency variations of crystal oscillator (*1) plus
frequency variations of RTC (*2)?
(*3)
* 1) Generally, crystal oscillators for commercial use are classified in terms of their center frequency depending
on their load capacitance (CL) and further divided into ranks on the order of
±10, ±20, and ±50ppm
depending on the degree of their oscillation frequency variations.
* 2) Basically, Model RV5C386A is configured to cause frequency variations on the order of
±5 to ±10ppm at
normal temperature.
* 3) Time count precision as referred to in the above flow chart is applicable to normal temperature and actually
affected by the temperature characteristics and other properties of crystal oscillators.


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