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参数资料
| 型号： | RS5C372A-E2 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | 0.65 MM PITCH, SSOP-8 |
| 文件页数： | 9/59页 |
| 文件大小： | 442K |
| 代理商： | RS5C372A-E2 |
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RS5C372A/B
13
GENERAL DESCRIPTION
1. Interfacing with the CPU
The RS5C372A/B read /write data over I
2C bus interface via 2-wires: 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 resistor on the circuit board. The maximum clock frequency of 400kHz of SCL enables data transfer in I
2C
bus fast mode.
2. Clock function
The clock function of the RS5C372A/B allows write/read data from lower two digits of the dominical year to sec-
onds 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.
3. Alarm function
˙ RS5C372A
The RS5C372A has an alarm function that outputs an interrupt signal from INTRA or INTRB 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 is output from the INTRA pin while the Alarm_B is output from either the INTRA or the INTRB pins.
Polling is possible separately for each alarm function.
˙ RS5C372B
The RS5C372B has an alarm function that outputs an interrupt signal from INTR output pin 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.
Polling is possible separately for each alarm function.
4. High precision time trimming function
The RS5C372A/B have an internal oscillation circuit capacitance CG and CD so that an oscillation circuit may be con-
figured simply by externally connecting a crystal. Either 32.768kHz or 32.000kHz may be selected as a crystal oscil-
lator by setting the internal register appropriately. The RS5C372A/B incorporate 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: 25C)
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.
*) The year 2000 is a leap year while the year 2100 is not.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RS5C372B | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C372B-E1 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C372B-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C373A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| RS5C4FC | 制造商:Dialight 功能描述: |
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