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RV5C387A Datasheet(PDF) 18 Page - RICOH electronics devices division

Part No. RV5C387A
Description  I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?
Download  42 Pages
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C387A Datasheet(HTML) 18 Page - RICOH electronics devices division

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RV5C387A
PRELIMINARY
12345
- 18 -
14.
USAGE
14.1.
Interfacing with the CPU
The RV5C387A employs the I
2C-Bus system to be connected to the CPU via 2-wires. Connection and
system of I
2C-Bus are described in the following sections.
14.1.1.
Connection of I
2C-Bus
2-wires, SCL and SDA pins that are connected to I2C-Bus are used for transmit clock pulses and data
respectively.
All ICs that are connected to these lines are designed that will 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.
Micro-
Controller
RV5C387A
Other
Peripheral
Device
VDD1
VDD2
VDD3
VDD4
SCL
SDA
* For data interface, the following conditions
must be met:
VDD4
≥VDD1
VDD4
≥VDD2
VDD4
≥VDD3
* When the master is one, the micro-
controller is ready for driving SCL to “H”
and Rp of SCL may not be required.
Rp
Rp
Cautions on determining Rp resistance,
(1) Dropping voltage at Rp due to sum of input current or output current at off conditions on each IC pin
connected to the I
2C-Bus shall be adequately small.
(2) Rising time of each signal be kept short even when all capacity of the bus is driven.
(3) Current consumed in I
2C-Bus is small compared to the consumption current permitted for the entire
system.
When all ICs connected to I
2C-Bus are CMOS type, condition (1) may usually be ignored since input current
and off-state output current is extremely small for the many CMOS type ICs.
Thus the maximum resistance
of Rp may be determined based on (2), while the minimum on (3) in most cases.
In actual cases a resistor may be place between the bus and input/output pins of each IC to improve noise
margins in which case the Rp minimum value may be determined by the resistance.
Consumption current in the bus to review (3) above may be expressed by the formula below:
Bus consumption current
(Sum of input current and off state output current of all devices in standby mode )
× Bus standby duration
Bus stand-by duration + the Bus operation duration
+
Supply voltage
× Bus operation duration × 2
Rp resistance
× 2 × (Bus stand-by duration + bus operation duration)
+ Supply voltage
× Bus capacity × Charging/Discharging times per unit time
Operation of “
× 2” in the second member denominator in the above formula is derived from assumption that
“L” duration of SDA and SCL pins are the half of bus operation duration.
× 2” in the numerator of the same
member is because there are two pins of SDA and SCL.
The third member, (charging/discharging times per
unit time) means number of transition from “H” to “L” of the signal line.


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