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參數(shù)資料
| 型號(hào)： | 1337DVGI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | REAL TIME CLOCK, PDSO8 |
| 封裝： | 3 MM, ROHS COMPLIANT, MSOP-8 |
| 文件頁(yè)數(shù)： | 18/24頁(yè) |
| 文件大小： | 362K |
| 代理商： | 1337DVGI |
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IDT1337
REA LTIME CLOCK WITH SERIAL INTERFACE
RTC
IDT REAL-TIME CLOCK WITH I2C SERIAL INTERFACE
3
IDT1337
REV J 111009
Typical Operating Circuit
Detailed Description
Communications to and from the IDT1337 occur serially
over an I2C bus. The IDT1337 operates as a slave device on
the serial bus. Access is obtained by implementing a START
condition and providing a device identification code,
followed by data. Subsequent registers can be accessed
sequentially until a STOP condition is executed. The device
is fully accessible through the I2C interface whenever VCC
is between 5.5 V and 1.8 V. I2C operation is not guaranteed
when VCC is below 1.8 V. The IDT1337 maintains the time
and date when VCC is as low as 1.3 V.
The following sections discuss in detail the Oscillator block,
Clock/Calendar Register Block 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 IDT1337 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).
CPU
X1
X2
VCC
SQW/INTB
INTA
GND
SDA
SCL
CRYSTAL
IDT1337
VCC
2k
VCC
10k
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 1338-31DCGI | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 1339-2DVGI | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 1339-31DCGI8 | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 13715-806-XTD | 300 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| 1374610-3 | INTERCONNECTION DEVICE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 1337DVGI8 | 制造商:Integrated Device Technology Inc 功能描述:REAL TIME CLOCK SERL 8TSSOP - Tape and Reel |
| 1337G0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| 1337G1 | 功能描述:重負(fù)荷電源連接器 PCB45 HORIZ (TOP) RA LP CONT. RoHS:否 制造商:Hirose Connector 系列:PS2 產(chǎn)品類型:Connectors 位置/觸點(diǎn)數(shù)量: 端接類型:Crimp 觸點(diǎn)材料: 觸點(diǎn)電鍍:Gold 電壓額定值: 電流額定值:300 A 附件類型: |
| 1337G2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| 1337GCSRI | 功能描述:實(shí)時(shí)時(shí)鐘 實(shí)時(shí)時(shí)鐘 with Embedded Crystal RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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