参数资料
| 型号： | DS1341T+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC RTC I2C W/ALARM 6TDFN-EP |
| 标准包装： | 50 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.8 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
8
Maxim Integrated
Low-Current I2C RTCs for High-ESR Crystals
DS1341/DS1342
External Synchronization
When an external clock reference is used, the input
from CLKIN/INTA is divided down to 1Hz by the divi-
sor selected by the CLKSEL[2:1] bits. The 1Hz from the
divider (Ext-1Hz, see the Functional Diagram) is used to
correct the 1Hz that is derived from the 32.768kHz oscil-
lator (Osc-1Hz). As Osc-1Hz drifts in relation to Ext-1Hz,
Osc-1Hz is digitally adjusted.
As shown in the Functional Diagram, the three highest
frequencies driving the SQW/INTB pin are derived from
the uncorrected oscillator, while the 1Hz output is derived
from the adjusted Osc-1Hz signal.
Conceptually, the circuit can be thought of as two 1Hz
signals, one derived from the internal oscillator and the
other derived from the external reference clock, with the
oscillator-derived 1Hz signal being locked to the 1Hz sig-
nal derived from the external reference clock. The edges
of the 1Hz signals do not need to be aligned with each
other. While the external clock source is present and
within tolerance, the Ext-1Hz and Osc-1Hz maintain their
existing lock, regardless of their edge alignment, with
periodic correction of the Osc-1Hz signal. If the external
signal is lost and then regained sometime later, the sig-
nals relock with whatever new alignment exists (Figure 3).
The Ext-1Hz is used by the device as long as it is within
tolerance, which is about 0.8% of Osc-1Hz. While Ext-
1Hz is within tolerance, the skew between the two sig-
nals could shift until a change of approximately 7.8ms
accumulates, after which the Osc-1Hz signal is adjusted
(Figure 4). The adjustment is accomplished by digitally
adjusting the 32kHz oscillator divider chain.
If the difference between Ext-1Hz and Osc-1Hz is greater
than approximately 0.8%, Osc-1Hz runs unadjusted (see
Figure 3) and the loss of signal (LOS) is set, provided
Figure 3. Loss and Reacquisition of External Reference Clock
Figure 4. Drift and Adjustment of Internal 1Hz to External Reference Clock
OSC-1Hz
FROM OSCILLATOR
EXT-1Hz
FROM EXTERNAL REFERENCE
SKEW
BREAK IN EXTERNAL REFERENCE SIGNAL
CURRENT LOCK
SHIFTED BACK TO CURRENT LOCK
DRIFT AFTER N CYCLES
OSC-1Hz
FROM OSCILLATOR
EXT-1Hz
FROM EXTERNAL REFERENCE
相关PDF资料 |
PDF描述 |
|---|---|
| DS1344D-33+ | IC RTC SPI 3.3V 14TDFN-EP |
| DS1347T+ | IC RTC/CALENDAR SPI 8TDFN |
| DS1371U+C01 | IC BINARY COUNTER 32-BIT 8-USOP |
| DS1372U+T&R | IC BINARY COUNTER 32-BIT 8-USOP |
| DS1374C-3# | IC RTC I2C W/CHARGER 16-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1341T+ | 功能描述:实时时钟 I2C RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1341T+T&R | 制造商:Maxim Integrated Products 功能描述:I2C RTC 6PF TDFN PB FREE T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/ALARM 8TDFN |
| DS1341T+T&R | 功能描述:实时时钟 I2C RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1341U+ | 功能描述:实时时钟 I2C RTC 6pF RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1341U+T&R | 制造商:Maxim Integrated Products 功能描述:LOW-CURRENT I?C RTC FOR HIGH-ESR CRYSTALS - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/ALARM 8USOP |
发布紧急采购，3分钟左右您将得到回复。