RV5C387A_03 datasheet(35/49 Pages) RICOH

Part #	RV5C387A

Description	I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C387A

Notes

1) Oscillation adjustment does not affect the frequency of 32.768-kHz clock pulses output from the 32KOUT

pin.

2) Oscillation adjustment value range: When the oscillation frequency is higher than the target frequency

(causing a time count gain), an appropriate time count gain ranges from –3.05ppm to –189.2ppm with the

settings of “0, 0, 0, 0, 0, 1, 0” to “0, 1, 1, 1, 1, 1, 1” written to the F6, F5, F4, F3, F2, F1, and F0 bits in the

oscillation adjustment register, thus allowing correction of a time count gain of up to +189.2ppm.

Conversely, when the oscillation frequency is lower than the target frequency (causing a time count loss),

an appropriate time count gain ranges from +3.05ppm to +189.2ppm with the settings of “1, 1, 1, 1, 1, 1, 1”

to “1, 0, 0, 0, 0, 1, 0” written to the F6, F5, F4, F3, F2, F1, and F0 bits in the oscillation adjustment register,

thus allowing correction of a time count loss of up to –189.2ppm.

2.4-2 When Oscillation Frequency is Equal to Target Frequency (There is Neither a Time Count Gain

nor a Time Count Loss)

Writing the oscillation adjustment value setting of “0”, “+1”, “–64”, or “–63” to the oscillation adjustment register

disables the oscillation adjustment circuit.

2.4-3 When Oscillation Frequency is Lower than Target Frequency (There is a Time Count Loss)

Oscillation adjustment value*

3 =

(Oscillation frequency – Target frequency)

Oscillation frequency

× 3.051 × 10–6

= (Oscillation frequency – Target frequency)

× 10

Oscillation adjustment value calculations are exemplified below.

(1) For an oscillation frequency of 32768.85Hz and a target frequency of 32768.05Hz:

Oscillation adjustment value = (32768.85 – 32768.05 + 0.1) / (32768.85

× 3.051 × 10–6) = (32768.85 – 32768.05) × 10 + 1

= 9.001 = 9

In this instance, write the settings of “0, 0, 0, 1, 0, 0, 1” to the F6, F5, F4, F3, F2, F1, and F0 bits in the oscillation

adjustment register. Thus, an appropriate oscillation adjustment value in the presence of any time count gain

represents a distance from 01h.

(2) For an oscillation frequency of 32763.95Hz and a target frequency of 32768.05Hz:

Oscillation adjustment value = (32763.95 – 32768.05) / (32763.95

× 3.051 × 10–6) = (32763.95 – 32768.05) × 10

= –41.015 = –41

To represent an oscillation adjustment value of –41 in 7-bit coded decimal notation, subtract 41(29h) from

128(80h) to obtain 57h. In this instance, write the settings of “1, 0, 1, 0, 1, 1, 1” in the F6, F5, F4, F3, F2, F1, and F0

bits in the oscillation adjustment register. Thus, an appropriate oscillation adjustment value in the presence of

any time count loss represents a distance from 80h.

Oscillation adjustment involves an adjustment differential of approximately ±1.5ppm from the target frequency

at normal temperature.

.

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RV5C387A Datasheet(PDF) 35 Page - RICOH electronics devices division

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