R2023K datasheet(30/50 Pages) RICOH

30 / 50 page

R2023K/T

• Measurement of Oscillation Frequency

Frequency

Counter

OSCIN

OSCOUT

32KOUT

VSS

32768Hz

VDD

CLKC

* 1) The R2023K/T 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.

• Adjustment of Oscillation frequency

The oscillation frequency of the oscillation circuit can be adjusted by varying procedures depending on the usage

of Model R2023K/T 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

YES

Use 32-kHz

clock output?

YES

Course (C)

Course (A)

Course (D)

YES

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, quartz crystal units 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 R2023K/T is configured to cause frequency variations on the order of

±5 to ±10ppm at 25°C.

* 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 quartz crystal units.

R2023K Datasheet(PDF) 30 Page - RICOH electronics devices division

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