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參數(shù)資料
| 型號： | R2051K |
| 英文描述： | real-time clock ICs |
| 中文描述： | 實時時鐘IC |
| 文件頁數(shù)： | 23/53頁 |
| 文件大?。?/td> | 343K |
| 代理商： | R2051K |
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R2051 Series
12345
Rev.1.04 - 23 -
Pull-up resistor (Rp) = 10k
, Bus capacity = 50pF(both for SCL, SDA), VCC=3v,
In a system with sum of input current and off-state output current of each pin = 0.1
μ
A,
I
2
C-Bus is used for 10ms every second while the rest of 990ms in the stand-by mode,
In this mode, number of transitions of the SCL pin from “H” to “L” state is 100 while SDA 50, every second.
Bus consumption current
≈
0.1
μ
A
×
990msec
990msec + 10msec
+ 3V
×
10msec
×
2
10K
×
2
×
(990msec + 10msec)
+ 3V
×
50pF
×
(100 + 50)
≈
0.099
μ
A + 3.0
μ
A + 0.0225
μ
A
≈
3.12
μ
A
Generally, the second member of the above formula is larger enough than the first and the third members bus
consumption current may be determined by the second member is many cases.
G
Transmission System of I
2
C-Bus
(1) Start Condition and Stop Condition
In I
2
C-Bus, SDA must be kept at a certain state while SCL is at the “H” state during data transmission as shown
below.
SCL
SDA
tSU;DAT
tHD;DAT
The SCL and SDA pins are at the “H” level when no data transmission is made. Changing the SDA from “H” to “L”
when the SCL and the SDA are “H” activates the Start Condition and access is started. Changing the SDA from “L”
to “H” when the SCL is “H” activates Stop Condition and accessing stopped. Generation of Start and Stop
Conditions are always made by the master (see the figure below).
Start Condition
SCL
SDA
tHD;STA
tSU;STO
Stop Condition
(2) Data transmission and its acknowledge
After Start condition is entered, data is transmitted by 1byte (8bits). Any bytes of data may be serially transmitted.
The receiving side will send an acknowledge signal to the transmission side each time 8bit data is transmitted.
The acknowledge signal is sent immediately after falling to “L” of SCL 8bit clock pulses of data is transmitted, by
releasing the SDA by the transmission side that has asserted the bus at that time and by turning SDA to “L” by
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|---|---|
| R2051K01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051K02-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S02-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S03-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
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