RV5C387A_03 datasheet(3/49 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

PIN DESCRIPTIONS

Pin No. Symbol

Item

Description

2

SCL

Serial Clock Line

This pin is used to input shift clock pulses to synchronize data input/output to and

from the SDA pin with this clock. Allows a maximum input voltage of 5.5 volts

regardless of supply voltage.

3

SDA

Serial Data Line

This pin inputs and outputs written or read data in synchronization with shift clock

pulses from the SCL pin. Allows a maximum input voltage of 5.5 volts regardless

of supply voltage.

6INTRA

Interrupt Output A

This pin outputs periodic interrupt pulses to the CPU. This pin is off when power

is activated from 0V. This pin functions as an Nch open drain output.

7

INTRB

Interrupt Output B

This pin outputs alarm interrupt (ALARM_W) to the CPU. This pin is off when

power is activated from 0V. This pin functions as an Nch open drain output.

4

INTRC

Interrupt Output C

This pin outputs alarm interrupt (ALARM_D) to the CPU. This pin is off when

power is activated from 0V. This pin functions as an Nch open drain output.

1

32KOUT

32-kHz Clock Output

The 32KOUT pin is used to output 32.768-kHz clock pulses. Enabled at power-on

from 0 volts. Nch. open drain output. The RV5C387A is designed to be disable 32-

kHz clock output in response to a command from the host computer.

The OSCIN and OSCOUT pins are used to connect the 32.768-kHz crystal

oscillator (with all other oscillation circuit components built into the RV5C387A).

The VDD pin is connected to the power supply. The VSS pin is grounded.

9

OSCIN

Oscillatory Circuit

8

OSCOUT

Input/Output

10

VDD

Positive Power Supply Input

5

VSS

Negative Power Supply Input

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RV5C387A Datasheet(PDF) 3 Page - RICOH electronics devices division

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