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(yè)數(shù)： 7/39頁(yè)
文件大?。?/td> 474K
代理商： RS5C372B
RS5C372B
- 7 -
I
Outline Description
1. Interfacing with the CPU
The RS5C372B reads/writes data over I
2
C-bus interface via two signal lines: SDA (data) and SCL (clock).
Since the output of the I/O pin of SDA is open drain, data interfacing with a CPU with different supply
voltage is possible by applying pull-up resistance on the circuit board. The maximum clock frequency of
400kHz of SCL enables data transfer in I
2
C-bus high-speed mode.
2. Clock function
The clock function of the RS5C372B allows write/read data from lower two digits of the dominical year to
seconds to and from the CPU. When lower two digits of the dominical year are multiples of 4, the year is
recognized as a leap year automatically. Up to the year 2099 leap years will be automatically recognized.
) The year 2000 is a leap year while the year 2100 is not.
3. Alarm function
The RS5C372B has an alarm function that outputs an interrupt signal from /INTR output pins to the CPU
when the day of the week, hour or minute corresponds to the setting. These two systems of alarms
(ALARM_A, ALARM_B), each may output interrupt signal separately at a specified time. The alarm may be
selectable between on and off for each day of the week, thus allowing outputting alarm everyday or on a
specific day of the week.
The ALARM_A and ALARM_B is output from the /INTR pins. Polling is possible separately for each alarm
system.
4. High precision time trimming function
The RS5C372B has internal oscillation circuit capacitance CG and CD so that an oscillation circuit may be
configured simply by externally connecting a crystal. Either 32.768kHz or 32.000kHz may be selected as a
crystal oscillator by setting the internal register appropriately. The RS5C372B incorporates a time trimming
circuit that adjusts gain or loss of the clock from the CPU up to approx.
±
189ppm (±194ppm when 32.000kHz
crystal is used) by approximately 3ppm steps to correct discrepancy in oscillation frequency. (Error after
correction:±1.5ppm:25
°
C)
Thus by adjusting frequencies for each system,
Clock display is possible at much higher precision than conventional real-time clock while using a
crystal with broader fluctuation in precision.
Even seasonal frequency fluctuation may be corrected by adjusting seasonal clock error.
For those systems that have temperature detection precision of clock function may be increased by
correcting clock error according to temperature fluctuations.
5. Oscillation halt sensing
The oscillation halt sensing function uses a register to store oscillation halt information. This function may
be used to determine if the RS5C372B supply power has been booted from 0V and if it has been backed up.
This function is useful for deter-mining if clock data is valid or invalid.
6. Periodic interrupt
The RS5C372B can output periodic interrupt pulses in addition to alarm function from the /INTR pin. This
frequency may be selected from 2Hz (every 0.5 seconds), 1Hz (every second), 1/60Hz (every minute),
1/3600Hz (every hour) and monthly (1st of month).
Output wave form for periodic interrupt may be selected from regular pulse wave form (2Hz and 1Hz) and
wave forms (every second, every minute, every hour and every month) that are appropriate for CPU level
interrupt. The RS5C372B has polling function that monitors pin status in the register.
7. 32kHz clock output
The RS5C372B may output oscillation frequency from the 32KOUT pin. This clock output is set for output by
default, which is set to on or off by setting the register. This pin functions as an CMOS push-pull output.
相關(guān)PDF資料
PDF描述
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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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