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RV5C386A Datasheet(PDF) 22 Page - RICOH electronics devices division

Part No. RV5C386A
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
Logo RICOH - RICOH electronics devices division

RV5C386A Datasheet(HTML) 22 Page - RICOH electronics devices division

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RV5C386A
22
USAGES
1. Interfacing with the CPU
The RV5C386A 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
RP
SDA
Microcontroller
RV5C386A
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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