RV5C387A_03 datasheet(22/49 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]

Direct Link	http://www.ricoh.com

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RV5C387A

22

USAGES

1. Interfacing with the CPU

The RV5C387A employs the I

2C bus system to be connected to the CPU via 2-wires. Connection and transfer

system of I

2C bus are described in the following sections.

Note

I

2C bus is a trademark of PHILIPS ELECTRONICS N.V.

1.1 Connection of I

2C bus

2-wires, SCL and SDA which are connected to I

2C bus are used for transmit clock pulses and data respectively.

All ICs that are connected to these lines are designed that will be not be clamped when a voltage beyond supply

voltage is applied to input or output pins. Open drain pins are used for output. This construction allows

communication of signals between ICs with different supply voltages by adding a pull-up resistor to each signal line

as shown in the figure below. Each IC is designed not to affect SCL and SDA signal lines when power to each of

these is turned off separately.

VDD1

VDD2

VDD3

VDD4

SCL

RP

SDA

Microcontroller

RV5C387A

Other

Peripheral

Device

*1) For data interface, the following conditions must be met:

VDD4

≥VDD1

VDD4

≥VDD2

VDD4

≥VDD3

*2) When the master is one, the micro controller is ready for

driving SCL to “H” and RP of SCL may not be required.

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RV5C387A Datasheet(PDF) 22 Page - RICOH electronics devices division

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