RV5C386A datasheet(39/42 Pages) RICOH | I2C-bus Real-Time Clock ICs with Voltage Monitoring Function

Part #	RV5C386A

Description	I2C-bus Real-Time Clock ICs with Voltage Monitoring Function

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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PRELIMINARY

RV5C386A

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14.8.

Typical Software-based Operations

14.8.1.

Initialization at Power-on

Start

*1)

Yes

No

VDET=0?

Warning Back-up

Battery Run-down

Set Oscillation Adjustment

Register and Control

Register 1 and 2, etc.

Power-on

*2)

*4)

*3)

XSTP=1?

Yes

No

*1) After power-on from 0 volt, the start of oscillation and the process of internal initialization require a time span

on the order of 1 to 2sec, so that access should be done after the lapse of this time span or more.

*2) The XSTP bit setting of 0 in the Control Register 1 indicates power-on from backup battery and not from 0v.

The XSTP bit may fail to be set to 1 in the presence of any excessive chattering in power supply in such

events as installing backup battery.

Should there be any possibility of this failure occurring, it is

recommended to initialize Model RV5C386A RTCs regardless of the current XSTP bit setting.

For further

details, see "14.3. Oscillation Halt Sensing and Supply Voltage Monitoring".

*3) This step is not required when the supply voltage monitoring circuit is not used.

*4) This step involves ordinary initialization including the Oscillation Adjustment Register and interrupt cycle

settings, etc.

14.8.2.

Writing of Time and Calendar Data

Write to Time Counter and

Calendar Counter

*2)

Stop Condition

*3)

Start Condition

*1)

*1) When writing to clock and calendar counters, do not insert Stop Condition

until all times from second to year have been written to prevent error in

writing time. (Detailed in "14.1.5. Data Transmission under Special

Condition".

*2) Any writing to the second counter will reset divider units lower than the

second digits.

*3) Take care so that process from Start Condition to Stop Condition will be

complete within 0.5sec.

(Detailed in "14.1.5. Data Transmission under

Special Condition".

The RV5C386A may also be initialized not at power-on but in the process

of writing time and calendar data.

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RV5C386A Datasheet(PDF) 39 Page - RICOH electronics devices division

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