RV5C339A datasheet(31/51 Pages) RICOH | 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION???

Part No.	RV5C339A

Description	3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION???

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C339A

28

2.2 Measurement of Oscillation Frequency

Frequency

counter

32.768kHz

OSCIN

OSCOUT

VDD

V

SS

32KOUT

RV5C339A

*1) The RV5C339A is configured to generate 32.768-kHz clock pulses for output from the 32KOUT pin at power-on conditionally on setting the XSTP bit to

1 in the control register 2.

*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 fre-

quency of the oscillation circuit.

*3) The 32KOUT output pin should be connected to the VDD pin with a pull-up resistor.

2.3 Adjustment of Oscillation Frequency

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

the RV5C339A 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

Use 32-kHz

clock circuit?

NO

YES

NO

Use 32-kHz clock circuit without regard

to its frequency precision?

Allowable time count precision is on order of oscillation

frequency variations of crystal oscillator *1 plus

frequency variations of real-time clock? *2, *3

Allowable time count precision is on order of oscillation

frequency variations of crystal oscillator *1 plus

frequency variations of real-time clock? *2, *3

To Course (A)

To Course (B)

To Course (C)

To Course (D)

*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 ±50 ppm depending on the degree of their oscillation frequency variations.

*2) Basically, the RV5C339A are 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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RV5C339A Datasheet(PDF) 31 Page - RICOH electronics devices division

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