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參數(shù)資料
| 型號： | ISL12022MIBZR5421 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | REAL TIME CLOCK, PDSO20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-013AC, SOIC-20 |
| 文件頁數(shù)： | 20/29頁 |
| 文件大?。?/td> | 395K |
| 代理商： | ISL12022MIBZR5421 |
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ISL12022MR5421
27
FN7576.1
June 4, 2010
layout of the RTC circuit will avoid noise pickup and
insure accurate clocking.
Figure 21 shows a suggested layout for the
ISL12022MR5421 device. The following main
precautions should be followed:
Do not run the serial bus lines or any high speed logic
lines in the vicinity of pins 1 and 20, or under the
package. These logic level lines can induce noise in
the oscillator circuit, causing misclocking.
Add a ground trace around the device with one end
terminated at the chip ground. This guard ring will
provide termination for emitted noise in the vicinity of
the RTC device
Be sure to ground pins 6 and 15 as well as pin 8 as
these all insure the integrity of the device ground
Add a 0.1F decoupling capacitor at the device VDD
pin, especially when using the 32.768kHz FOUT
function.
The best way to run clock lines around the RTC is to stay
outside of the ground ring by at least a few millimeters.
Also, use the VBAT and VDD as guard ring lines as well,
they can isolate clock lines from the oscillator section. In
addition, if the IRQ/FOUT pin is used as a clock, it should
be routed away from the RTC device as well.
Measuring Oscillator Accuracy
The best way to analyze the ISL12022MR5421 frequency
accuracy is to set the IRQ/FOUT pin for a specific
frequency, and look at the output of that pin on a high
accuracy frequency counter (at least 7 digits accuracy).
Note that the IRQ/FOUT is an drain output and will
require a pull-up resistor.
Using the 1.0Hz output frequency is the most convenient
as the ppm error is expressed in Equation 6:
Other frequencies may be used for measurement but the
error calculation becomes more complex. Use the FOUT
output and a frequency counter for the most accurate
results. Also, when the proper layout guidelines above
are observed, the oscillator should start-up in most
circuits in less than one second.
Temperature Compensation Operation
The ISL12022MR5421 temperature compensation
feature needs to be enabled by the user. This must be
done in a specific order as follows.
1. Read register 0Dh, the BETA register. This register
contains the 5-bit BETA trimmed value, which is
automatically loaded on initial power-up. Mask off
the 5 LSB’s of the value just read.
2. Bit 7 of the BETA register is the master enable
control for temperature sense operation. Set this to
“1” to allow continuous temperature frequency
correction. Frequency correction will then happen
every 60 seconds with VDD applied.
3. Bits 5 and 6 of the BETA register control
temperature compensation in battery backup mode
(see Table 15). Set the values for the operation
desired.
4. Write back to register 0Dh making sure not to
change the 5 LSB values, and include the desired
compensation control bits.
Note that every time the BETA register is written with the
TSE bit = 1, a temperature compensation cycle is
instigated and a new correction value will be loaded into
the FATR/FDTR registers (if the temperature changed
since the last conversion).
Also note that registers 0Bh and 0Ch, the ITR0 and
ALPHA registers, are READ-ONLY, and cannot be written
to. Also the value for BETA is locked and cannot be
changed with a write. However, It is still a good idea to
FIGURE 20. READ SEQUENCE (CSR SLAVE ADDRESS SHOWN)
SIGNALS
FROM THE
MASTER
SIGNALS FROM
THE SLAVE
SIGNAL AT
SDA
S
T
A
R
T
IDENTIFICATION
BYTE WITH
R/W = 0
ADDRESS
BYTE
A
C
K
A
C
K
0
S
T
O
P
A
C
K
1
IDENTIFICATION
BYTE WITH
R/W = 1
A
C
K
S
T
A
R
T
LAST READ
DATA BYTE
FIRST READ
DATA BYTE
A
C
K
10
1
1111
10
1
11 11
FIGURE 21. SUGGESTED LAYOUT FOR THE
ISL12022MR5421
FOUT
SCL
SDA
GROUND
RING
ppm error
F
OUT
11e6
–
=
(EQ. 6)
ISL12022MR5421
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL12022MIBZ-T | 功能描述:實時時鐘 REAL TIME CLK & TEMP COMPENSATED 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| ISL12022MIBZ-T7A | 功能描述:IC RTC/CALENDAR TEMP SNSR 20SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件 |
| ISL12022MIBZ-TR5421 | 功能描述:實時時鐘 REAL TIME CLK W/MFK IMPROVED ESD AIR 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| ISL12022MR5421 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power RTC with Battery Backed SRAM, Integrated 5ppm |
| ISL12022M-R5421 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:High-Accuracy RTC Modules, Feature-Rich RTCs |
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