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RV5C387A Datasheet(PDF) 34 Page - RICOH electronics devices division

Part No. RV5C387A
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC 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

RV5C387A Datasheet(HTML) 34 Page - RICOH electronics devices division

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RV5C387A
34
2.4 Oscillation Adjustment Circuit
The oscillation adjustment circuit can be used to correct a time count gain or loss with high precision by varying the
number of 1-second clock pulses once per 20 seconds. When such oscillation adjustment is not to be made, the
oscillation adjustment circuit can be disabled by writing the settings of “*, 0, 0, 0, 0, 0, *” (“*” representing “0” or
“1”) to the F6, F5, F4, F3, F2, F1, and F0 bits in the oscillation adjustment circuit. Conversely, when such oscillation
adjustment is to be made, an appropriate oscillation adjustment value can be calculated by the equation below for
writing to the oscillation adjustment circuit.
2.4-1 When Oscillation Frequency *
1 is Higher than Target Frequency *2 (There is a Time Count Gain)
Oscillation adjustment value*
3 =
(Oscillation frequency – Target frequency + 0.1)
Oscillation frequency
× 3.051 × 10–6
= (Oscillation frequency – Target frequency)
× 10 + 1
*1) Oscillation frequency:
Frequency of clock pulses output from the 32KOUT pin at normal temperature in the manner described in “2.2
Measurement of Oscillation Frequency”.
*2) Target frequency:
Desired frequency to be set. Generally, a 32.768-kHz crystal oscillator has such temperature characteristics as to have
the highest oscillation frequency at normal temperature. Consequently, the crystal oscillator is recommended to have
target frequency settings on the order of 32.768 to 32.76810kHz (+3.05ppm relative to 32.768kHz). Note that the target
frequency differs depending on the environment or location where the equipment incorporating the real-time clocks is
expected to be operated.
*3) Oscillation adjustment value: Value that is to be finally written to the F0 to F6 bits in the oscillation adjustment register and is represented in 7-bit coded
decimal notation.
*1) The CGOUT should have a capacitance ranging from 0 to 15pF.
Course (D)
It is necessary to select the crystal oscillator in the same manner as in Course (C) as well as correct errors in the
time count of each real-time clock in the same manner as in Course (B) by the method described in “2.4 Oscillation
Adjustment Circuit”.
RV5C387A
RF
RD
CD
CG
OSCIN
OSCOUT
32kHz
VDD
10
9
8
VDD
CGOUT*1
Another advisable way to select a crystal oscillator having an optimum CL value is to contact the manufacturer of the
crystal oscillator intended for use with the RV5C387A.
Incidentally, the high oscillation frequency of the crystal oscillator can also be adjusted by adding an external
oscillation stabilization capacitor CGOUT as illustrated in the diagram below.
.


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