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參數(shù)資料
| 型號： | RS5C348A-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | Real-Time Clock |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO10 |
| 封裝： | 6.40 X 3.50 MM, 1.25 MM HEIGHT, 0.5 MM PITCH, SSOP-10 |
| 文件頁數(shù)： | 4/53頁 |
| 文件大小： | 452K |
| 代理商： | RS5C348A-E2 |
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1
4-WIRE SERIAL INTERFACE REAL-TIME CLOCK IC
S
WITH VOLTAGE MONITORING FUNCTION
R
×
5C348A/B
OUTLINE
The R
×
5C348A/B are CMOS real-time clock ICs connected to the CPU by four signal lines CE (Chip Enable),
SCLK (Serial Clock), SI (Serial Input), and SO (Serial Output) and configured to perform serial transmission of time
and calendar data to the CPU. 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 circuits generate interrupt signals at preset
times. The oscillation circuit is driven under constant voltage so that fluctuations in oscillation frequency due to
voltage are small and supply current is also small (TYP. 0.35μA for the R
×
5C348A and 0.55μA for the R
×
5C348B at
3 volts). 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 (Nch. open drain) 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. The 32-kHz clock circuit can be disabled by certain register settings for the R
×
5C348A but cannot be
disabled by any register settings for the R
×
5C348B. Both these models come in an ultra-compact 10-pin SSOP
(RS5C348A/B with a height of 1.25mm and a pin pitch of 0.5mm) and 10-pin SSOP-G(RV5C348A/B with a height of
1.2mm and a pin pitch of 0.5mm.)
FEATURES
Timekeeping supply voltage ranging from 1.45 to 5.5 volts
Low supply current: TYP. 0.35μA (MAX. 0.8μA) at 3 volts (at 25
C
) for the R
×
5C348A
TYP. 0.55μA (MAX. 1.0μA) at 3 volts (at 25
C
) for the R
×
5C348B
Only four signal lines (CE, SCLK, SI, and SO) required for connection to the CPU.
Maximum clock frequency of 2MHz (with V
DD
of 5 volts)
Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days,
and weeks) (in BCD format)
1900/2000 identification bit for Year 2000 compliance
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 circuit
2 alarm circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute
alarm settings)
32-kHz clock circuit (Nch. open drain output) The R
×
5C348A is designed to disable 32-kHz clock output in
response to a command from the host computer and the R
×
5C348B is designed to keep 32-kHz output enabled.
Oscillation halt sensing circuit which can be used to judge the validity of internal data
Supply voltage monitoring circuit with two supply voltage monitoring threshold settings
Automatic identification of leap years up to the year 2099
Built-in oscillation stabilization capacitors (C
G
and C
D
)
CMOS process
Ultra-compact 10-pin SSOP(RS5C348A/B) 10-pin SSOP-G(RV5C348A/B)
Selectable 12-hour and 24-hour mode settings
High precision oscillation adjustment circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RS5C348B-E2 | Real-Time Clock |
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| RT1710B7 | LVDS & LVPECL FPGA Terminator RoHS Compliant Parts Available |
| RT1720B7 | LVDS & LVPECL FPGA Terminator RoHS Compliant Parts Available |
| RT1721B6 | LVDS & LVPECL FPGA Terminator RoHS Compliant Parts Available |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RS5C348B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:4-WIRE SERIAL INTERFACE |
| RS5C348B-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Real-Time Clock |
| RS5C372A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs |
| RS5C372B | 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-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) |
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