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參數(shù)資料
| 型號(hào)： | R2051K01 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, QCC12 |
| 封裝： | 2 X 2 MM, 0.85 MM PITCH, ULTRA-COMPACT, FFP, 12 PIN |
| 文件頁(yè)數(shù)： | 1/53頁(yè) |
| 文件大小： | 343K |
| 代理商： | R2051K01 |
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’02.12.06
12345
I
2C-Bus Real-Time Clock ICs
with Battery Backup switch-over Function
R2051 Series
12345
Rev.1.04
- 1 -
n OUTLINE
The R2051 is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL and SDA, and configured
to perform serial transmission of time and calendar data to the CPU. Further, battery backup switchover circuit and
a voltage detector. The periodic interrupt circuit is configured to generate interrupt signals with six selectable
interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset
times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply
voltage is small, and the time keeping current is small (TYP. 0.4
A at 3V). The oscillation halt sensing circuit can
be used to judge the validity of internal data in such events as power-on; The supply voltage monitoring circuit is
configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The
32-kHz clock output function (CMOS output) is intended to output sub-clock pulses for the external microcomputer.
The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in
the oscillation frequency of the crystal oscillator. Battery backup switchover function is the automatic switchover
circuit between a main power supply and a backup battery of primary or secondary battery. Switchover is executed
by monitoring the voltage of a main power supply, therefore the voltage of a backup battery voltage is not relevant.
This model comes in an ultra-compact FFP12 (Height 0.85mm, 2.0mm
×2.0mm).
n FEATURES
l
Minimum Timekeeping supply voltage Typ. 0.75V (Max. 1.00V); VDD pin
l
Low power consumption
0.4
A TYP (1.0A MAX.) at VDD=3V
l
Built-in Backup switchover circuit (can be used for a primary battery, a secondary battery, or an electric double
layer capacitor)
l
Only two signal lines (SCL and SDA) required for connection to the CPU.
( I
2C-Bus Interface, 400kHz)
l
Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days,
and weeks) (in BCD format)
l
Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to
the CPU and provided with an interrupt flag and an interrupt halt
l
2 alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute
alarm settings)
l
Built-in voltage detector with delay
l
With Power-on flag to prove that the power supply starts from 0V
l
32-kHz clock output pin (CMOS output. “H” level is always equal to VCC.)
l
Supply voltage monitoring circuit with two supply voltage monitoring threshold settings
l
Automatic identification of leap years up to the year 2099
l
Selectable 12-hour and 24-hour mode settings
l Built-in oscillation stabilization capacitors (CG and CD)
l
High precision oscillation adjustment circuit
l
CMOS process
l Ultra-compact FFP12
n PIN CONFIGURATION
VDD
VCC
SDA
VSS
TOP VIEW
R2051K(FFP12)
VSB
/VDCC
SCL
CLKOUT
CIN
OSCIN
OSCOUT
/INTR
10
11
12
1
2
3
4
7
5
6
9
8
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相關(guān)代理商/技術(shù)參數(shù) |
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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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