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參數(shù)資料
| 型號： | R2061K |
| 英文描述： | real-time clock ICs |
| 中文描述： | 實時時鐘IC |
| 文件頁數(shù)： | 8/48頁 |
| 文件大?。?/td> | 322K |
| 代理商： | R2061K |
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R2061 Series
I
GENERAL DESCRIPTION
G
Battery Backup Switchover Function
The R2061 Series have two power supply input, or VCC and VSB. With monitoring VCC pin input voltage, which
voltage between the two is supplied to the internal power supply is decided.
Refer to the next table to see the state of the backup battery and internal power supply’s state of the IC by each
condition.
VCC
≥
VDET1
VCC
<
VDET1
VCC
→
RTC, VDD
/VDCC=OFF(H)
/VDCC=L
As a backup battery, not only a primary battery such as CR2025, LR44, or a secondary battery such as ML614,
TC616, but also an electric double layered capacitor or an aluminum capacitor can be used. Switchover point is
judged with the voltage of the main power (VCC), therefore, if the backup voltage is higher than main supply voltage,
switchover can be realized without extra load to the backup power supply.
12345
Rev.1.00 - 8 -
VSB
→
RTC, VDD
VDD
VSB
VCC
VSS
0.1
μ
F
CPU Power
Supply
The case of back-up by
primary battery
CR2025
etc.
VSB
VDD
VCC
VSS
0.1
μ
F
CPU power
supply
ML614
etc.
The case of back-up by
capacitor or secondary battery
(Charging voltage is equal to CPU
power supply voltage)
VSB
VDD
VCC
VSS
0.1
μ
F
CPU power
supply
(3V)
5V
Double layer
capacitor
etc.
The case of back-up by
capacitor or secondary battery
(Charging voltage is not equal to
CPU power supply voltage)
Interface with CPU
The R2061 is connected to the CPU by three signal lines CE (Chip Enable), SCLK (Serial Clock), and SIO (Serial
Input / Output), through which it reads and writes data from and to the CPU. The CPU can be accessed when the
CE pin is held high. Access clock pulses have a maximum frequency of 1 MHz, allowing high-speed data transfer
to the CPU. VCC falls down under -VDET1, the R2061 stops accessing with CPU.
G
Clock and Calendar Function
The R2061 reads and writes time data from and to the CPU in units ranging from seconds to the last two digits of
the calendar year. The calendar year will automatically be identified as a leap year when its last two digits are a
multiple of 4. Consequently, leap years up to the year 2099 can automatically be identified as such.
*) The year 2000 is a leap year while the year 2100 is not a leap year.
G
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| R2061K01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2061K03-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2061S02-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2062 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2062K01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
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