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瑞萨电子 实时时钟 (RTC IC) 是超低功耗的时钟/日期器件,配有可编程的时段警报和可编程方波输出。 这些器件具有高抗噪和低电流消耗特性,采用 12/24 小时运行模式,可提供闰年自动更正及可编程方波输出功能,是各类设计应用的理想选择。
瑞萨电子的实时时钟 IC 能计算秒、分、小时、星期、日期、月和年,其闰年补偿有效期达到 2100 年。 这些器件拥有正常和快速模式 I2C 接口、两个时段警报、一个振荡器 停止标志、通电时默认为 32 kHz 的可编程方波输出及 1.8 至 5.5V 的工作电压。瑞萨电子 1338 实时时钟 IC 包括一个电池供电的 56-字节非易失性 RAM,用于存储数据。
实时时钟 IC (RTC IC) 是一种可跟踪当前时间和日期的集成电路,通常能够计算秒、分钟、小时、天、月、年(含闰年补偿)。 虽然该术语通常是指个人电脑、服务器和嵌入式系统中的器件,但实时时钟 IC 目前几乎存在于需要保持准确时间的任何电子器件中。 瑞萨电子的大部分实时时钟使用外部晶体振荡器,但有些则采用集成式振荡器以简化电路和减少物料清单 (BOM)。 在大多数情况下,振荡器'的频率为 32.768 kHz(正好为每秒 2^15 个周期),使其成为与二进制计数器电路配合使用的方便速率。
Interface |
Alarms (#) |
Supply Voltage Vcc (Min) (V) |
Battery Backup |
Battery Seal |
CPU Supervisory Function POR |
Crystal Frequency Trimming |
Frequency Out Pin |
Battery Current (nA) |
Time Keeping Current (µA) |
SRAM |
Selectable Frequency Output |
Oscillator Compensation |
TRIP Voltage for POR |
Accuracy |
Other Functions |
|
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器件号 | ||||||||||||||||
Real-Time Clock With I2C Serial Interface | I2C | 2 | 1.8 | 否 | 否 | 否 | 否 | 否 | 300 | 0.9 | 1 | ±10 ppm | ||||
Real-Time Clock With Battery Backed Non-Volatile RAM | I2C | 0 | 1.8 | 否 | 否 | 否 | 否 | 否 | 300 | 1.4 | 56 Bytes | 1 | ±20 ppm | |||
Real-Time Clock With Serial I2C Interface | I2C | 2 | 2 | 否 | 否 | 否 | 否 | 否 | 300 | 1.4 | 1 | ±20 ppm | ||||
I2C Real Time Clock with Battery Backup Low Power RTC with Battery ReSeal™ Function | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 800 | 1.6 | 1 | -94 to +140 | ||||
Real Time Clock with Embedded Crystal, ±5ppm Accuracy | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 1000 | 3.5 | 128 Bytes | 15 | -336 to +337 | 6 Select VTRIP Levels | ±5 ppm | Battery Status Monitor, Battery Switchover Time Stamp and more... |
Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Day Light Saving | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 1000 | 3.5 | 128 Bytes | 15 | -336 to +337 | 6 Select VTRIP Levels | ±5 ppm | Battery Status Monitor, Battery Switchover Time Stamp and more... |
Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 1000 | 3.5 | 128 Bytes | 15 | -336 to +337 | 6 Select VTRIP Levels | ±5 ppm | Battery Status Monitor, Battery Switchover Time Stamp and more... |
Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 1000 | 3.5 | 128 Bytes | 15 | -336 to +337 | 6 Select VTRIP Levels | ±5 ppm | Battery Status Monitor, Battery Switchover Time Stamp and more... |
Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 1000 | 3.5 | 128 Bytes | 15 | -336 to +337 | 6 Select VTRIP Levels | ±5 ppm | Battery Status Monitor, Battery Switchover Time Stamp and more... |
Real Time Clock/Calendar with I2C Bus™ and EEPROM | I2C | 2 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 850 | 5 | 512x8-Bit EEPROM | 3 | -64 to +110 | |||
Real Time Clock/Calendar with I2C Bus™ and EEPROM | I2C | 2 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 850 | 5 | 512x8-Bit EEPROM | 3 | -64 to +110 | |||
Low Cost and Low Power I2C Real Time Clock/Calendar with Alarm Function and Dual IRQ Pins | I2C | 2 | 1.4 | 否 | 否 | 是的 | 否 | 是的 | 0.5 | 4 | Dual Alarms, Dual IRQs | |||||
Low Cost and Low Power I2C Bus™ Real Time Clock/Calendar Low Power and Low Cost RTC with Alarm Function | I2C | 2 | 1.4 | 否 | 否 | 否 | 否 | 是的 | 0.5 | 4 | Dual Alarms | |||||
I2C Real Time Clock/Calendar, Low Power RTC with Battery-Backed SRAM | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 400 | 1.2 | 2 Bytes | 15 | -94 to +140 | Yes | ||
Low Power RTC with Battery Backed SRAM and Event Detection | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 400 | 1.2 | 2 Bytes | 15 | -94 to +140 | Yes | Event Detect | |
Low Power RTC with Battery Backed SRAM and Event Detection | I2C | 1 | 2.7 | 是的 | 是的 | 否 | 是的 | 是的 | 400 | 1.2 | 2 Bytes | 15 | -94 to +140 | Event Detect, Time Stamp |