參數(shù)資料
型號(hào)： RS5C372B
廠商： RICOH COMPANY LTD
元件分類： XO, clock
英文描述： I2C-bus Serial Interface Real Time Clock (8pin SSOP)
中文描述： REAL TIME CLOCK, PDSO8
封裝： SSOP-8
文件頁數(shù)： 17/39頁
文件大?。?/td> 474K
代理商： RS5C372B
RS5C372B
- 17 -
I
Functional Description
1. Interfacing with the CPU
The RS5C372B employs the I
2
C-bus system to be connected to the CPU via two signal lines. Connection
and transfer system of I
2
C-bus are described in the following section
1.1. Connection of I
2
C-bus
Two signal lines, SCL and SDA which are connected to I
2
C-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 resistance to each
signal line as shown in the figure below. Each IC is de-signed not to affect SCL and SDA signal lines when power
to each of these is turned off separately.
VDD1
VDD2
Micro-
Controller
RS5C372B
Other
Peripheral
Device
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) Voltage drop at RP due to sum of input current or output current at off conditions on each IC pin
connected to the I
2
C-bus shall be adequately small.
(2) Rising time shall be kept short even when all capacity of the bus is driven.
(3) Current consumed in I
2
C-bus is small compared to the consumption current permitted for the entire
system.
When all ICs connected to I
2
C-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 stand-by mode)
×
Bus stand-by duration
Bus stand-by duration + 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 “x 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. “x 2” in the numerator of
the
same member is because there are two pins of SDA and SCL. The third member, (charging/discharging
相關(guān)PDF資料
PDF描述
RS5C372B-E1 I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C372B-E2 I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C62 REAL-TIME CLOCK
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RS5C372B-E1 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C372B-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C373A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock
RS5C4FC 制造商:Dialight 功能描述:
RS5C4F-C 制造商:DIALIGHT 制造商全稱:Dialight Corporation 功能描述:StreetSense? RS Series LED Roadway Sign Light
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