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RV5C338A-E2 Datasheet

  • RV5C338A-E2

  • 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MON...

  • 52頁

  • RICOH

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R
脳
5C338A
2.2 Measurement of Oscillation Frequency
R
脳
5C338A
VDD
OSCIN
OSCOUT
CLKC
32KOUT
V
SS
Frequency
counter
32.768kHz
*
1) The R
脳
5C338A are 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 CLKC input should be connected to the V
DD
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 R
脳
5C338A 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?
YES
NO
Allowable time count precision is on order of oscillation
frequency variations of crystal oscillator *
1
plus
frequency variations of real-time clock? *
2,
*
3
YES
YES
To Course (A)
NO
To Course (B)
Use 32-kHz clock circuit without regard
to its frequency precision?
To Course (C)
NO
Allowable time count precision is on order of oscillation
frequency variations of crystal oscillator *
1
plus
frequency variations of real-time clock? *
2,
*
3
YES
NO
To Course (D)
Generally, crystal oscillators for commercial use are classified in terms of their center frequency depending on their load capacitance (C
L
) and further
divided into ranks on the order of 鹵10, 鹵 20, and 鹵50 ppm depending on the degree of their oscillation frequency variations.
*
2) Basically, the R
脳
5C338A are configured to cause frequency variations on the order of 鹵5 to 鹵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.
*
1)
28

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