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| 型号： | 1339-2DVGI |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | 3 MM, ROHS COMPLIANT, MSOP-8 |
| 文件页数： | 20/26页 |
| 文件大小： | 330K |
| 代理商： | 1339-2DVGI |
IDT1339
REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
RTC
IDT
REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
3
IDT1339
REV N 060311
Typical Operating Circuit
Detailed Description
The following sections discuss in detail the Oscillator block,
Power Control block, Clock/Calendar Register, Alarms,
trickle Charger, and Serial I2C block.
Oscillator Block
Selection of the right crystal, correct load capacitance and
careful PCB layout are important for a stable crystal
oscillator. Due to the optimization for the lowest possible
current in the design for these oscillators, losses caused by
parasitic currents can have a significant impact on the
overall oscillator performance. Extra care needs to be taken
to maintain a certain quality and cleanliness of the PCB.
Crystal Selection
The key parameters when selecting a 32 kHz crystal to work
with IDT1339 RTC are:
Recommended Load Capacitance
Crystal Effective Series Resistance (ESR)
Frequency Tolerance
Effective Load Capacitance
Please see diagram below for effective load capacitance
calculation. The effective load capacitance (CL) should
match the recommended load capacitance of the crystal in
order for the crystal to oscillate at its specified parallel
resonant frequency with 0ppm frequency error.
In the above figure, X1 and X2 are the crystal pins of our
device. Cin1 and Cin2 are the internal capacitors which
include the X1 and X2 pin capacitance. Cex1 and Cex2 are
the external capacitors that are needed to tune the crystal
frequency. Ct1 and Ct2 are the PCB trace capacitances
between the crystal and the device pins. CS is the shunt
capacitance of the crystal (as specified in the crystal
manufacturer's datasheet or measured using a network
analyzer).
Note: IDT1339CSRI integrates a standard 32.768 kHz
(±20ppm) crystal in the package and contributes an
additional frequency error of 10ppm at nominal VCC (+3.3 V)
and TA=+25°C.
CPU
X1
X2
VCC
SQW/INT
VBACKUP
GND
SDA
SCL
CRYSTAL
IDT1339
+
-
VCC
RPU
2k
VCC
10k
RPU
2k
12
6
5
7
3
4
8
相关PDF资料 |
PDF描述 |
|---|---|
| 1339-31DCGI8 | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 13715-806-XTD | 300 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| 1374610-3 | INTERCONNECTION DEVICE |
| 1376137-1 | POWER CONNECTOR |
| 1380B-8 | BRASS, GOLD FINISH, PCB TERMINAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 1339-2DVGI8 | 功能描述:实时时钟 RTC BASE 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 |
| 13393 | 制造商:Desco Industries Inc 功能描述:BG STSHLD MTL-IN 16''X30'' 100EA |
| 1339-3/4"x60yd | 功能描述:胶带 1339 TAPE 3/4X60YDS BULK 3" PAPER CORE RoHS:否 制造商:3M Electronic Specialty 产品:Tapes 类型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 颜色: 材料:Copper Foil 宽度:1 in x 18 yds |
| 1339-3/4INX60YDS | 制造商:3M Electronic Products Division 功能描述:80008005862 |
| 1339-3/8"x60yd | 功能描述:胶带 TAPE 3/8 INX60YD BULK 3"CORE RoHS:否 制造商:3M Electronic Specialty 产品:Tapes 类型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 颜色: 材料:Copper Foil 宽度:1 in x 18 yds |
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