RV5C387A_03 datasheet(21/49 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

Day-of-week

12-hour mode

24-hour mode

Preset alarm time

Sun. Mon. Tue. Wed. Thu.

Fri.

Sat.

10-hour 1-hour 10-min 1-min 10-hour 1-hour 10-min 1-min

WW0 WW1 WW2 WW3 WW4 WW5 WW6

00:00 a.m. on all days

1

1111112000000

01:30 a.m. on all days

1

1111101300130

11:59 a.m. on all days

1

1111111591159

00:00 p.m. on

011111032001200

Mondays to Fridays

01:30 p.m. on Sundays

1

0

0000021301330

11:59 p.m. on Mondays,

010101031592359

Wednesdays, and Fridays

Note that the correspondence between WW0 to WW6 and the days of the week shown in the above table is only an

example and not mandatory.

D7

D6

D5

D4

D3

D2

D1

D0

—DM40

DM20

DM10

DM8

DM4

DM2

DM1

0DM40

DM20

DM10

DM8

DM4

DM2

DM1

0

Indefinite

(For writing)

(For reading)

Default settings*

2.8-1 Alarm_D Minute Register (at Address Bh)

D7

D6

D5

D4

D3

D2

D1

D0

——

DH20,DP/A

DH10

DH8

DH4

DH2

DH1

00

DH20,DP/A

DH10

DH8

DH4

DH2

DH1

00

Indefinite

(For writing)

(For reading)

Default settings*

2.8-2 Alarm_D Hour Register (at Address Ch)

2.8 Alarm_D Registers (at Addresses Bh to Ch)

*) Default settings: Default value means read/written values when the XSTP bit is set to “1” due to power-on from 0 volts or supply voltage drop.

· The D5 bit represents DP/A when the 12-hour mode is selected (0 for a.m. and 1 for p.m.). and DH20 when the 24-

hour mode is selected (tens in the hour digits).

· The Alarm_D registers should not have any non-existent alarm time settings. (Note that any mismatch between

current time and preset alarm time specified by the Alarm_D registers may disable the alarm circuit.)

· When the 12-hour mode is selected, the hour digits read 12 and 32 for 0 a.m. and 0 p.m., respectively (see “2.1-2

12/24: 12-/24-hour Mode Selection Bit”).

Example of Alarm Time Setting

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RV5C387A Datasheet(PDF) 21 Page - RICOH electronics devices division

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