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.

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